前端的裁剪我知道的可以分为这么两种：flash一种，canvas一种。现在用的多的是canvas这种。
其实裁剪最本质的原理：通过工具获取到图片（不是JS那种获取DOM的方式，比如flash获取到图片，对图片任意操作，canvas也是一样，将图片放在画布上，任意操作）
本文使用的是canvas这种方式，借助的是cropper.js实现图片的裁剪。
由于前端页面使用的是layui这个框架，所有使用cropper时，最好的能够将cropper这个包作为一个layui的扩展嵌入到layui中，这样都省事，嵌入很简单，具体可以参考下面我封装好的代码
备注：cropper默认裁剪后的图片格式为png格式，如果需要自定义上传图片的格式，可以参考下面这段代码，如果不需要请直接忽略
cropper修改上传图片的格式：
var cas=imageEle.cropper('getCroppedCanvas');var base64url=cas.toDataURL('image/jpeg');console.log(base64url); //生成base64图片的格式// 展示裁剪的图片的两种方式// 方式一$('.cavans').html(cas) //在body显示出canvas元素// 方式二$('.canvans').attr("src", base64url);
封装好的cropper源码如下，包括cropper-jQuery的
具体代码：
cropper-css
/*! * Cropper.js v1.4.3 * https://fengyuanchen.github.io/cropperjs * * Copyright 2015-present Chen Fengyuan * Released under the MIT license * * Date: 2018-10-24T13:07:11.429Z */.cropper-container { direction: ltr; font-size: 0; line-height: 0; position: relative; -ms-touch-action: none; touch-action: none; -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none;}.cropper-container img { display: block; height: 100%; image-orientation: 0deg; max-height: none !important; max-width: none !important; min-height: 0 !important; min-width: 0 !important; width: 100%;}.cropper-wrap-box,.cropper-canvas,.cropper-drag-box,.cropper-crop-box,.cropper-modal { bottom: 0; left: 0; position: absolute; right: 0; top: 0;}.cropper-wrap-box,.cropper-canvas { overflow: hidden;}.cropper-drag-box { background-color: #fff; opacity: 0;}.cropper-modal { background-color: #000; opacity: .5;}.cropper-view-box { display: block; height: 100%; outline-color: rgba(51, 153, 255, 0.75); outline: 1px solid #39f; overflow: hidden; width: 100%;}.cropper-dashed { border: 0 dashed #eee; display: block; opacity: .5; position: absolute;}.cropper-dashed.dashed-h { border-bottom-width: 1px; border-top-width: 1px; height: calc(100% / 3); left: 0; top: calc(100% / 3); width: 100%;}.cropper-dashed.dashed-v { border-left-width: 1px; border-right-width: 1px; height: 100%; left: calc(100% / 3); top: 0; width: calc(100% / 3);}.cropper-center { display: block; height: 0; left: 50%; opacity: .75; position: absolute; top: 50%; width: 0;}.cropper-center:before,.cropper-center:after { background-color: #eee; content: ' '; display: block; position: absolute;}.cropper-center:before { height: 1px; left: -3px; top: 0; width: 7px;}.cropper-center:after { height: 7px; left: 0; top: -3px; width: 1px;}.cropper-face,.cropper-line,.cropper-point { display: block; height: 100%; opacity: .1; position: absolute; width: 100%;}.cropper-face { background-color: #fff; left: 0; top: 0;}.cropper-line { background-color: #39f;}.cropper-line.line-e { cursor: ew-resize; right: -3px; top: 0; width: 5px;}.cropper-line.line-n { cursor: ns-resize; height: 5px; left: 0; top: -3px;}.cropper-line.line-w { cursor: ew-resize; left: -3px; top: 0; width: 5px;}.cropper-line.line-s { bottom: -3px; cursor: ns-resize; height: 5px; left: 0;}.cropper-point { background-color: #39f; height: 5px; opacity: .75; width: 5px;}.cropper-point.point-e { cursor: ew-resize; margin-top: -3px; right: -3px; top: 50%;}.cropper-point.point-n { cursor: ns-resize; left: 50%; margin-left: -3px; top: -3px;}.cropper-point.point-w { cursor: ew-resize; left: -3px; margin-top: -3px; top: 50%;}.cropper-point.point-s { bottom: -3px; cursor: s-resize; left: 50%; margin-left: -3px;}.cropper-point.point-ne { cursor: nesw-resize; right: -3px; top: -3px;}.cropper-point.point-nw { cursor: nwse-resize; left: -3px; top: -3px;}.cropper-point.point-sw { bottom: -3px; cursor: nesw-resize; left: -3px;}.cropper-point.point-se { bottom: -3px; cursor: nwse-resize; height: 20px; opacity: 1; right: -3px; width: 20px;}@media (min-width: 768px) { .cropper-point.point-se { height: 15px; width: 15px; }}@media (min-width: 992px) { .cropper-point.point-se { height: 10px; width: 10px; }}@media (min-width: 1200px) { .cropper-point.point-se { height: 5px; opacity: .75; width: 5px; }}.cropper-point.point-se:before { background-color: #39f; bottom: -50%; content: ' '; display: block; height: 200%; opacity: 0; position: absolute; right: -50%; width: 200%;}.cropper-invisible { opacity: 0;}.cropper-bg { background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAAA3NCSVQICAjb4U/gAAAABlBMVEXMzMz////TjRV2AAAACXBIWXMAAArrAAAK6wGCiw1aAAAAHHRFWHRTb2Z0d2FyZQBBZG9iZSBGaXJld29ya3MgQ1M26LyyjAAAABFJREFUCJlj+M/AgBVhF/0PAH6/D/HkDxOGAAAAAElFTkSuQmCC');}.cropper-hide { display: block; height: 0; position: absolute; width: 0;}.cropper-hidden { display: none !important;}.cropper-move { cursor: move;}.cropper-crop { cursor: crosshair;}.cropper-disabled .cropper-drag-box,.cropper-disabled .cropper-face,.cropper-disabled .cropper-line,.cropper-disabled .cropper-point { cursor: not-allowed;}cropper-css
cropper-js
/*! * Cropper.js v1.4.3 * https://fengyuanchen.github.io/cropperjs * * Copyright 2015-present Chen Fengyuan * Released under the MIT license * * Date: 2018-10-24T13:07:15.032Z */(function (global, factory) { typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() : typeof define === 'function' && define.amd ? define(factory) : global.layui && layui.define ? layui.define(function (exports) { exports('cropper', factory()) }) : (global.Cropper = factory());}(this, (function () { 'use strict'; function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); } function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } } function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; } function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); } function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) arr2[i] = arr[i]; return arr2; } } function _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter); } function _nonIterableSpread() { throw new TypeError("Invalid attempt to spread non-iterable instance"); } var IN_BROWSER = typeof window !== 'undefined'; var WINDOW = IN_BROWSER ? window : {}; var NAMESPACE = 'cropper'; // Actions var ACTION_ALL = 'all'; var ACTION_CROP = 'crop'; var ACTION_MOVE = 'move'; var ACTION_ZOOM = 'zoom'; var ACTION_EAST = 'e'; var ACTION_WEST = 'w'; var ACTION_SOUTH = 's'; var ACTION_NORTH = 'n'; var ACTION_NORTH_EAST = 'ne'; var ACTION_NORTH_WEST = 'nw'; var ACTION_SOUTH_EAST = 'se'; var ACTION_SOUTH_WEST = 'sw'; // Classes var CLASS_CROP = "".concat(NAMESPACE, "-crop"); var CLASS_DISABLED = "".concat(NAMESPACE, "-disabled"); var CLASS_HIDDEN = "".concat(NAMESPACE, "-hidden"); var CLASS_HIDE = "".concat(NAMESPACE, "-hide"); var CLASS_INVISIBLE = "".concat(NAMESPACE, "-invisible"); var CLASS_MODAL = "".concat(NAMESPACE, "-modal"); var CLASS_MOVE = "".concat(NAMESPACE, "-move"); // Data keys var DATA_ACTION = "".concat(NAMESPACE, "Action"); var DATA_PREVIEW = "".concat(NAMESPACE, "Preview"); // Drag modes var DRAG_MODE_CROP = 'crop'; var DRAG_MODE_MOVE = 'move'; var DRAG_MODE_NONE = 'none'; // Events var EVENT_CROP = 'crop'; var EVENT_CROP_END = 'cropend'; var EVENT_CROP_MOVE = 'cropmove'; var EVENT_CROP_START = 'cropstart'; var EVENT_DBLCLICK = 'dblclick'; var EVENT_POINTER_DOWN = WINDOW.PointerEvent ? 'pointerdown' : 'touchstart mousedown'; var EVENT_POINTER_MOVE = WINDOW.PointerEvent ? 'pointermove' : 'touchmove mousemove'; var EVENT_POINTER_UP = WINDOW.PointerEvent ? 'pointerup pointercancel' : 'touchend touchcancel mouseup'; var EVENT_READY = 'ready'; var EVENT_RESIZE = 'resize'; var EVENT_WHEEL = 'wheel mousewheel DOMMouseScroll'; var EVENT_ZOOM = 'zoom'; // Mime types var MIME_TYPE_JPEG = 'image/jpeg'; // RegExps var REGEXP_ACTIONS = /^(?:e|w|s|n|se|sw|ne|nw|all|crop|move|zoom)$/; var REGEXP_DATA_URL = /^data:/; var REGEXP_DATA_URL_JPEG = /^data:image\/jpeg;base64,/; var REGEXP_TAG_NAME = /^(?:img|canvas)$/i; var DEFAULTS = { // Define the view mode of the cropper viewMode: 0, // 0, 1, 2, 3 // Define the dragging mode of the cropper dragMode: DRAG_MODE_CROP, // 'crop', 'move' or 'none' // Define the initial aspect ratio of the crop box initialAspectRatio: NaN, // Define the aspect ratio of the crop box aspectRatio: NaN, // An object with the previous cropping result data data: null, // A selector for adding extra containers to preview preview: '', // Re-render the cropper when resize the window responsive: true, // Restore the cropped area after resize the window restore: true, // Check if the current image is a cross-origin image checkCrossOrigin: false, // Check the current image's Exif Orientation information checkOrientation: true, // Show the black modal modal: true, // Show the dashed lines for guiding guides: true, // Show the center indicator for guiding center: true, // Show the white modal to highlight the crop box highlight: true, // Show the grid background background: true, // Enable to crop the image automatically when initialize autoCrop: true, // Define the percentage of automatic cropping area when initializes autoCropArea: 0.8, // Enable to move the image movable: true, // Enable to rotate the image rotatable: true, // Enable to scale the image scalable: true, // Enable to zoom the image zoomable: true, // Enable to zoom the image by dragging touch zoomOnTouch: true, // Enable to zoom the image by wheeling mouse zoomOnWheel: true, // Define zoom ratio when zoom the image by wheeling mouse wheelZoomRatio: 0.1, // Enable to move the crop box cropBoxMovable: true, // Enable to resize the crop box cropBoxResizable: true, // Toggle drag mode between "crop" and "move" when click twice on the cropper toggleDragModeOnDblclick: true, // Size limitation minCanvasWidth: 0, minCanvasHeight: 0, minCropBoxWidth: 0, minCropBoxHeight: 0, minContainerWidth: 200, minContainerHeight: 100, // Shortcuts of events ready: null, cropstart: null, cropmove: null, cropend: null, crop: null, zoom: null }; var TEMPLATE = '<div class="cropper-container" touch-action="none">' + '<div class="cropper-wrap-box">' + '<div class="cropper-canvas"></div>' + '</div>' + '<div class="cropper-drag-box"></div>' + '<div class="cropper-crop-box">' + '<span class="cropper-view-box"></span>' + '<span class="cropper-dashed dashed-h"></span>' + '<span class="cropper-dashed dashed-v"></span>' + '<span class="cropper-center"></span>' + '<span class="cropper-face"></span>' + '<span class="cropper-line line-e" data-cropper-action="e"></span>' + '<span class="cropper-line line-n" data-cropper-action="n"></span>' + '<span class="cropper-line line-w" data-cropper-action="w"></span>' + '<span class="cropper-line line-s" data-cropper-action="s"></span>' + '<span class="cropper-point point-e" data-cropper-action="e"></span>' + '<span class="cropper-point point-n" data-cropper-action="n"></span>' + '<span class="cropper-point point-w" data-cropper-action="w"></span>' + '<span class="cropper-point point-s" data-cropper-action="s"></span>' + '<span class="cropper-point point-ne" data-cropper-action="ne"></span>' + '<span class="cropper-point point-nw" data-cropper-action="nw"></span>' + '<span class="cropper-point point-sw" data-cropper-action="sw"></span>' + '<span class="cropper-point point-se" data-cropper-action="se"></span>' + '</div>' + '</div>'; /** * Check if the given value is not a number. */ var isNaN = Number.isNaN || WINDOW.isNaN; /** * Check if the given value is a number. * @param {*} value - The value to check. * @returns {boolean} Returns `true` if the given value is a number, else `false`. */ function isNumber(value) { return typeof value === 'number' && !isNaN(value); } /** * Check if the given value is undefined. * @param {*} value - The value to check. * @returns {boolean} Returns `true` if the given value is undefined, else `false`. */ function isUndefined(value) { return typeof value === 'undefined'; } /** * Check if the given value is an object. * @param {*} value - The value to check. * @returns {boolean} Returns `true` if the given value is an object, else `false`. */ function isObject(value) { return _typeof(value) === 'object' && value !== null; } var hasOwnProperty = Object.prototype.hasOwnProperty; /** * Check if the given value is a plain object. * @param {*} value - The value to check. * @returns {boolean} Returns `true` if the given value is a plain object, else `false`. */ function isPlainObject(value) { if (!isObject(value)) { return false; } try { var _constructor = value.constructor; var prototype = _constructor.prototype; return _constructor && prototype && hasOwnProperty.call(prototype, 'isPrototypeOf'); } catch (e) { return false; } } /** * Check if the given value is a function. * @param {*} value - The value to check. * @returns {boolean} Returns `true` if the given value is a function, else `false`. */ function isFunction(value) { return typeof value === 'function'; } /** * Iterate the given data. * @param {*} data - The data to iterate. * @param {Function} callback - The process function for each element. * @returns {*} The original data. */ function forEach(data, callback) { if (data && isFunction(callback)) { if (Array.isArray(data) || isNumber(data.length) /* array-like */ ) { var length = data.length; var i; for (i = 0; i < length; i += 1) { if (callback.call(data, data[i], i, data) === false) { break; } } } else if (isObject(data)) { Object.keys(data).forEach(function (key) { callback.call(data, data[key], key, data); }); } } return data; } /** * Extend the given object. * @param {*} obj - The object to be extended. * @param {*} args - The rest objects which will be merged to the first object. * @returns {Object} The extended object. */ var assign = Object.assign || function assign(obj) { for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) { args[_key - 1] = arguments[_key]; } if (isObject(obj) && args.length > 0) { args.forEach(function (arg) { if (isObject(arg)) { Object.keys(arg).forEach(function (key) { obj[key] = arg[key]; }); } }); } return obj; }; var REGEXP_DECIMALS = /\.\d*(?:0|9){12}\d*$/; /** * Normalize decimal number. * Check out {@link http://0.30000000000000004.com/} * @param {number} value - The value to normalize. * @param {number} [times=100000000000] - The times for normalizing. * @returns {number} Returns the normalized number. */ function normalizeDecimalNumber(value) { var times = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 100000000000; return REGEXP_DECIMALS.test(value) ? Math.round(value * times) / times : value; } var REGEXP_SUFFIX = /^(?:width|height|left|top|marginLeft|marginTop)$/; /** * Apply styles to the given element. * @param {Element} element - The target element. * @param {Object} styles - The styles for applying. */ function setStyle(element, styles) { var style = element.style; forEach(styles, function (value, property) { if (REGEXP_SUFFIX.test(property) && isNumber(value)) { value += 'px'; } style[property] = value; }); } /** * Check if the given element has a special class. * @param {Element} element - The element to check. * @param {string} value - The class to search. * @returns {boolean} Returns `true` if the special class was found. */ function hasClass(element, value) { return element.classList ? element.classList.contains(value) : element.className.indexOf(value) > -1; } /** * Add classes to the given element. * @param {Element} element - The target element. * @param {string} value - The classes to be added. */ function addClass(element, value) { if (!value) { return; } if (isNumber(element.length)) { forEach(element, function (elem) { addClass(elem, value); }); return; } if (element.classList) { element.classList.add(value); return; } var className = element.className.trim(); if (!className) { element.className = value; } else if (className.indexOf(value) < 0) { element.className = "".concat(className, " ").concat(value); } } /** * Remove classes from the given element. * @param {Element} element - The target element. * @param {string} value - The classes to be removed. */ function removeClass(element, value) { if (!value) { return; } if (isNumber(element.length)) { forEach(element, function (elem) { removeClass(elem, value); }); return; } if (element.classList) { element.classList.remove(value); return; } if (element.className.indexOf(value) >= 0) { element.className = element.className.replace(value, ''); } } /** * Add or remove classes from the given element. * @param {Element} element - The target element. * @param {string} value - The classes to be toggled. * @param {boolean} added - Add only. */ function toggleClass(element, value, added) { if (!value) { return; } if (isNumber(element.length)) { forEach(element, function (elem) { toggleClass(elem, value, added); }); return; } // IE10-11 doesn't support the second parameter of `classList.toggle` if (added) { addClass(element, value); } else { removeClass(element, value); } } var REGEXP_HYPHENATE = /([a-z\d])([A-Z])/g; /** * Transform the given string from camelCase to kebab-case * @param {string} value - The value to transform. * @returns {string} The transformed value. */ function hyphenate(value) { return value.replace(REGEXP_HYPHENATE, '$1-$2').toLowerCase(); } /** * Get data from the given element. * @param {Element} element - The target element. * @param {string} name - The data key to get. * @returns {string} The data value. */ function getData(element, name) { if (isObject(element[name])) { return element[name]; } if (element.dataset) { return element.dataset[name]; } return element.getAttribute("data-".concat(hyphenate(name))); } /** * Set data to the given element. * @param {Element} element - The target element. * @param {string} name - The data key to set. * @param {string} data - The data value. */ function setData(element, name, data) { if (isObject(data)) { element[name] = data; } else if (element.dataset) { element.dataset[name] = data; } else { element.setAttribute("data-".concat(hyphenate(name)), data); } } /** * Remove data from the given element. * @param {Element} element - The target element. * @param {string} name - The data key to remove. */ function removeData(element, name) { if (isObject(element[name])) { try { delete element[name]; } catch (e) { element[name] = undefined; } } else if (element.dataset) { // #128 Safari not allows to delete dataset property try { delete element.dataset[name]; } catch (e) { element.dataset[name] = undefined; } } else { element.removeAttribute("data-".concat(hyphenate(name))); } } var REGEXP_SPACES = /\s\s*/; var onceSupported = function () { var supported = false; if (IN_BROWSER) { var once = false; var listener = function listener() { }; var options = Object.defineProperty({}, 'once', { get: function get() { supported = true; return once; }, /** * This setter can fix a `TypeError` in strict mode * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Getter_only} * @param {boolean} value - The value to set */ set: function set(value) { once = value; } }); WINDOW.addEventListener('test', listener, options); WINDOW.removeEventListener('test', listener, options); } return supported; }(); /** * Remove event listener from the target element. * @param {Element} element - The event target. * @param {string} type - The event type(s). * @param {Function} listener - The event listener. * @param {Object} options - The event options. */ function removeListener(element, type, listener) { var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {}; var handler = listener; type.trim().split(REGEXP_SPACES).forEach(function (event) { if (!onceSupported) { var listeners = element.listeners; if (listeners && listeners[event] && listeners[event][listener]) { handler = listeners[event][listener]; delete listeners[event][listener]; if (Object.keys(listeners[event]).length === 0) { delete listeners[event]; } if (Object.keys(listeners).length === 0) { delete element.listeners; } } } element.removeEventListener(event, handler, options); }); } /** * Add event listener to the target element. * @param {Element} element - The event target. * @param {string} type - The event type(s). * @param {Function} listener - The event listener. * @param {Object} options - The event options. */ function addListener(element, type, listener) { var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {}; var _handler = listener; type.trim().split(REGEXP_SPACES).forEach(function (event) { if (options.once && !onceSupported) { var _element$listeners = element.listeners, listeners = _element$listeners === void 0 ? {} : _element$listeners; _handler = function handler() { delete listeners[event][listener]; element.removeEventListener(event, _handler, options); for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) { args[_key2] = arguments[_key2]; } listener.apply(element, args); }; if (!listeners[event]) { listeners[event] = {}; } if (listeners[event][listener]) { element.removeEventListener(event, listeners[event][listener], options); } listeners[event][listener] = _handler; element.listeners = listeners; } element.addEventListener(event, _handler, options); }); } /** * Dispatch event on the target element. * @param {Element} element - The event target. * @param {string} type - The event type(s). * @param {Object} data - The additional event data. * @returns {boolean} Indicate if the event is default prevented or not. */ function dispatchEvent(element, type, data) { var event; // Event and CustomEvent on IE9-11 are global objects, not constructors if (isFunction(Event) && isFunction(CustomEvent)) { event = new CustomEvent(type, { detail: data, bubbles: true, cancelable: true }); } else { event = document.createEvent('CustomEvent'); event.initCustomEvent(type, true, true, data); } return element.dispatchEvent(event); } /** * Get the offset base on the document. * @param {Element} element - The target element. * @returns {Object} The offset data. */ function getOffset(element) { var box = element.getBoundingClientRect(); return { left: box.left + (window.pageXOffset - document.documentElement.clientLeft), top: box.top + (window.pageYOffset - document.documentElement.clientTop) }; } var location = WINDOW.location; var REGEXP_ORIGINS = /^(https?:)\/\/([^:/?#]+):?(\d*)/i; /** * Check if the given URL is a cross origin URL. * @param {string} url - The target URL. * @returns {boolean} Returns `true` if the given URL is a cross origin URL, else `false`. */ function isCrossOriginURL(url) { var parts = url.match(REGEXP_ORIGINS); return parts && (parts[1] !== location.protocol || parts[2] !== location.hostname || parts[3] !== location.port); } /** * Add timestamp to the given URL. * @param {string} url - The target URL. * @returns {string} The result URL. */ function addTimestamp(url) { var timestamp = "timestamp=".concat(new Date().getTime()); return url + (url.indexOf('?') === -1 ? '?' : '&') + timestamp; } /** * Get transforms base on the given object. * @param {Object} obj - The target object. * @returns {string} A string contains transform values. */ function getTransforms(_ref) { var rotate = _ref.rotate, scaleX = _ref.scaleX, scaleY = _ref.scaleY, translateX = _ref.translateX, translateY = _ref.translateY; var values = []; if (isNumber(translateX) && translateX !== 0) { values.push("translateX(".concat(translateX, "px)")); } if (isNumber(translateY) && translateY !== 0) { values.push("translateY(".concat(translateY, "px)")); } // Rotate should come first before scale to match orientation transform if (isNumber(rotate) && rotate !== 0) { values.push("rotate(".concat(rotate, "deg)")); } if (isNumber(scaleX) && scaleX !== 1) { values.push("scaleX(".concat(scaleX, ")")); } if (isNumber(scaleY) && scaleY !== 1) { values.push("scaleY(".concat(scaleY, ")")); } var transform = values.length ? values.join(' ') : 'none'; return { WebkitTransform: transform, msTransform: transform, transform: transform }; } /** * Get the max ratio of a group of pointers. * @param {string} pointers - The target pointers. * @returns {number} The result ratio. */ function getMaxZoomRatio(pointers) { var pointers2 = assign({}, pointers); var ratios = []; forEach(pointers, function (pointer, pointerId) { delete pointers2[pointerId]; forEach(pointers2, function (pointer2) { var x1 = Math.abs(pointer.startX - pointer2.startX); var y1 = Math.abs(pointer.startY - pointer2.startY); var x2 = Math.abs(pointer.endX - pointer2.endX); var y2 = Math.abs(pointer.endY - pointer2.endY); var z1 = Math.sqrt(x1 * x1 + y1 * y1); var z2 = Math.sqrt(x2 * x2 + y2 * y2); var ratio = (z2 - z1) / z1; ratios.push(ratio); }); }); ratios.sort(function (a, b) { return Math.abs(a) < Math.abs(b); }); return ratios[0]; } /** * Get a pointer from an event object. * @param {Object} event - The target event object. * @param {boolean} endOnly - Indicates if only returns the end point coordinate or not. * @returns {Object} The result pointer contains start and/or end point coordinates. */ function getPointer(_ref2, endOnly) { var pageX = _ref2.pageX, pageY = _ref2.pageY; var end = { endX: pageX, endY: pageY }; return endOnly ? end : assign({ startX: pageX, startY: pageY }, end); } /** * Get the center point coordinate of a group of pointers. * @param {Object} pointers - The target pointers. * @returns {Object} The center point coordinate. */ function getPointersCenter(pointers) { var pageX = 0; var pageY = 0; var count = 0; forEach(pointers, function (_ref3) { var startX = _ref3.startX, startY = _ref3.startY; pageX += startX; pageY += startY; count += 1; }); pageX /= count; pageY /= count; return { pageX: pageX, pageY: pageY }; } /** * Check if the given value is a finite number. */ var isFinite = Number.isFinite || WINDOW.isFinite; /** * Get the max sizes in a rectangle under the given aspect ratio. * @param {Object} data - The original sizes. * @param {string} [type='contain'] - The adjust type. * @returns {Object} The result sizes. */ function getAdjustedSizes(_ref4) // or 'cover' { var aspectRatio = _ref4.aspectRatio, height = _ref4.height, width = _ref4.width; var type = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'contain'; var isValidNumber = function isValidNumber(value) { return isFinite(value) && value > 0; }; if (isValidNumber(width) && isValidNumber(height)) { var adjustedWidth = height * aspectRatio; if (type === 'contain' && adjustedWidth > width || type === 'cover' && adjustedWidth < width) { height = width / aspectRatio; } else { width = height * aspectRatio; } } else if (isValidNumber(width)) { height = width / aspectRatio; } else if (isValidNumber(height)) { width = height * aspectRatio; } return { width: width, height: height }; } /** * Get the new sizes of a rectangle after rotated. * @param {Object} data - The original sizes. * @returns {Object} The result sizes. */ function getRotatedSizes(_ref5) { var width = _ref5.width, height = _ref5.height, degree = _ref5.degree; degree = Math.abs(degree) % 180; if (degree === 90) { return { width: height, height: width }; } var arc = degree % 90 * Math.PI / 180; var sinArc = Math.sin(arc); var cosArc = Math.cos(arc); var newWidth = width * cosArc + height * sinArc; var newHeight = width * sinArc + height * cosArc; return degree > 90 ? { width: newHeight, height: newWidth } : { width: newWidth, height: newHeight }; } /** * Get a canvas which drew the given image. * @param {HTMLImageElement} image - The image for drawing. * @param {Object} imageData - The image data. * @param {Object} canvasData - The canvas data. * @param {Object} options - The options. * @returns {HTMLCanvasElement} The result canvas. */ function getSourceCanvas(image, _ref6, _ref7, _ref8) { var imageAspectRatio = _ref6.aspectRatio, imageNaturalWidth = _ref6.naturalWidth, imageNaturalHeight = _ref6.naturalHeight, _ref6$rotate = _ref6.rotate, rotate = _ref6$rotate === void 0 ? 0 : _ref6$rotate, _ref6$scaleX = _ref6.scaleX, scaleX = _ref6$scaleX === void 0 ? 1 : _ref6$scaleX, _ref6$scaleY = _ref6.scaleY, scaleY = _ref6$scaleY === void 0 ? 1 : _ref6$scaleY; var aspectRatio = _ref7.aspectRatio, naturalWidth = _ref7.naturalWidth, naturalHeight = _ref7.naturalHeight; var _ref8$fillColor = _ref8.fillColor, fillColor = _ref8$fillColor === void 0 ? 'transparent' : _ref8$fillColor, _ref8$imageSmoothingE = _ref8.imageSmoothingEnabled, imageSmoothingEnabled = _ref8$imageSmoothingE === void 0 ? true : _ref8$imageSmoothingE, _ref8$imageSmoothingQ = _ref8.imageSmoothingQuality, imageSmoothingQuality = _ref8$imageSmoothingQ === void 0 ? 'low' : _ref8$imageSmoothingQ, _ref8$maxWidth = _ref8.maxWidth, maxWidth = _ref8$maxWidth === void 0 ? Infinity : _ref8$maxWidth, _ref8$maxHeight = _ref8.maxHeight, maxHeight = _ref8$maxHeight === void 0 ? Infinity : _ref8$maxHeight, _ref8$minWidth = _ref8.minWidth, minWidth = _ref8$minWidth === void 0 ? 0 : _ref8$minWidth, _ref8$minHeight = _ref8.minHeight, minHeight = _ref8$minHeight === void 0 ? 0 : _ref8$minHeight; var canvas = document.createElement('canvas'); var context = canvas.getContext('2d'); var maxSizes = getAdjustedSizes({ aspectRatio: aspectRatio, width: maxWidth, height: maxHeight }); var minSizes = getAdjustedSizes({ aspectRatio: aspectRatio, width: minWidth, height: minHeight }, 'cover'); var width = Math.min(maxSizes.width, Math.max(minSizes.width, naturalWidth)); var height = Math.min(maxSizes.height, Math.max(minSizes.height, naturalHeight)); // Note: should always use image's natural sizes for drawing as // imageData.naturalWidth === canvasData.naturalHeight when rotate % 180 === 90 var destMaxSizes = getAdjustedSizes({ aspectRatio: imageAspectRatio, width: maxWidth, height: maxHeight }); var destMinSizes = getAdjustedSizes({ aspectRatio: imageAspectRatio, width: minWidth, height: minHeight }, 'cover'); var destWidth = Math.min(destMaxSizes.width, Math.max(destMinSizes.width, imageNaturalWidth)); var destHeight = Math.min(destMaxSizes.height, Math.max(destMinSizes.height, imageNaturalHeight)); var params = [-destWidth / 2, -destHeight / 2, destWidth, destHeight]; canvas.width = normalizeDecimalNumber(width); canvas.height = normalizeDecimalNumber(height); context.fillStyle = fillColor; context.fillRect(0, 0, width, height); context.save(); context.translate(width / 2, height / 2); context.rotate(rotate * Math.PI / 180); context.scale(scaleX, scaleY); context.imageSmoothingEnabled = imageSmoothingEnabled; context.imageSmoothingQuality = imageSmoothingQuality; context.drawImage.apply(context, [image].concat(_toConsumableArray(params.map(function (param) { return Math.floor(normalizeDecimalNumber(param)); })))); context.restore(); return canvas; } var fromCharCode = String.fromCharCode; /** * Get string from char code in data view. * @param {DataView} dataView - The data view for read. * @param {number} start - The start index. * @param {number} length - The read length. * @returns {string} The read result. */ function getStringFromCharCode(dataView, start, length) { var str = ''; var i; length += start; for (i = start; i < length; i += 1) { str += fromCharCode(dataView.getUint8(i)); } return str; } var REGEXP_DATA_URL_HEAD = /^data:.*,/; /** * Transform Data URL to array buffer. * @param {string} dataURL - The Data URL to transform. * @returns {ArrayBuffer} The result array buffer. */ function dataURLToArrayBuffer(dataURL) { var base64 = dataURL.replace(REGEXP_DATA_URL_HEAD, ''); var binary = atob(base64); var arrayBuffer = new ArrayBuffer(binary.length); var uint8 = new Uint8Array(arrayBuffer); forEach(uint8, function (value, i) { uint8[i] = binary.charCodeAt(i); }); return arrayBuffer; } /** * Transform array buffer to Data URL. * @param {ArrayBuffer} arrayBuffer - The array buffer to transform. * @param {string} mimeType - The mime type of the Data URL. * @returns {string} The result Data URL. */ function arrayBufferToDataURL(arrayBuffer, mimeType) { var chunks = []; var chunkSize = 8192; var uint8 = new Uint8Array(arrayBuffer); while (uint8.length > 0) { chunks.push(fromCharCode.apply(void 0, _toConsumableArray(uint8.subarray(0, chunkSize)))); uint8 = uint8.subarray(chunkSize); } return "data:".concat(mimeType, ";base64,").concat(btoa(chunks.join(''))); } /** * Get orientation value from given array buffer. * @param {ArrayBuffer} arrayBuffer - The array buffer to read. * @returns {number} The read orientation value. */ function resetAndGetOrientation(arrayBuffer) { var dataView = new DataView(arrayBuffer); var orientation; // Ignores range error when the image does not have correct Exif information try { var littleEndian; var app1Start; var ifdStart; // Only handle JPEG image (start by 0xFFD8) if (dataView.getUint8(0) === 0xFF && dataView.getUint8(1) === 0xD8) { var length = dataView.byteLength; var offset = 2; while (offset + 1 < length) { if (dataView.getUint8(offset) === 0xFF && dataView.getUint8(offset + 1) === 0xE1) { app1Start = offset; break; } offset += 1; } } if (app1Start) { var exifIDCode = app1Start + 4; var tiffOffset = app1Start + 10; if (getStringFromCharCode(dataView, exifIDCode, 4) === 'Exif') { var endianness = dataView.getUint16(tiffOffset); littleEndian = endianness === 0x4949; if (littleEndian || endianness === 0x4D4D /* bigEndian */ ) { if (dataView.getUint16(tiffOffset + 2, littleEndian) === 0x002A) { var firstIFDOffset = dataView.getUint32(tiffOffset + 4, littleEndian); if (firstIFDOffset >= 0x00000008) { ifdStart = tiffOffset + firstIFDOffset; } } } } } if (ifdStart) { var _length = dataView.getUint16(ifdStart, littleEndian); var _offset; var i; for (i = 0; i < _length; i += 1) { _offset = ifdStart + i * 12 + 2; if (dataView.getUint16(_offset, littleEndian) === 0x0112 /* Orientation */ ) { // 8 is the offset of the current tag's value _offset += 8; // Get the original orientation value orientation = dataView.getUint16(_offset, littleEndian); // Override the orientation with its default value dataView.setUint16(_offset, 1, littleEndian); break; } } } } catch (e) { orientation = 1; } return orientation; } /** * Parse Exif Orientation value. * @param {number} orientation - The orientation to parse. * @returns {Object} The parsed result. */ function parseOrientation(orientation) { var rotate = 0; var scaleX = 1; var scaleY = 1; switch (orientation) { // Flip horizontal case 2: scaleX = -1; break; // Rotate left 180° case 3: rotate = -180; break; // Flip vertical case 4: scaleY = -1; break; // Flip vertical and rotate right 90° case 5: rotate = 90; scaleY = -1; break; // Rotate right 90° case 6: rotate = 90; break; // Flip horizontal and rotate right 90° case 7: rotate = 90; scaleX = -1; break; // Rotate left 90° case 8: rotate = -90; break; default: } return { rotate: rotate, scaleX: scaleX, scaleY: scaleY }; } var render = { render: function render() { this.initContainer(); this.initCanvas(); this.initCropBox(); this.renderCanvas(); if (this.cropped) { this.renderCropBox(); } }, initContainer: function initContainer() { var element = this.element, options = this.options, container = this.container, cropper = this.cropper; addClass(cropper, CLASS_HIDDEN); removeClass(element, CLASS_HIDDEN); var containerData = { width: Math.max(container.offsetWidth, Number(options.minContainerWidth) || 200), height: Math.max(container.offsetHeight, Number(options.minContainerHeight) || 100) }; this.containerData = containerData; setStyle(cropper, { width: containerData.width, height: containerData.height }); addClass(element, CLASS_HIDDEN); removeClass(cropper, CLASS_HIDDEN); }, // Canvas (image wrapper) initCanvas: function initCanvas() { var containerData = this.containerData, imageData = this.imageData; var viewMode = this.options.viewMode; var rotated = Math.abs(imageData.rotate) % 180 === 90; var naturalWidth = rotated ? imageData.naturalHeight : imageData.naturalWidth; var naturalHeight = rotated ? imageData.naturalWidth : imageData.naturalHeight; var aspectRatio = naturalWidth / naturalHeight; var canvasWidth = containerData.width; var canvasHeight = containerData.height; if (containerData.height * aspectRatio > containerData.width) { if (viewMode === 3) { canvasWidth = containerData.height * aspectRatio; } else { canvasHeight = containerData.width / aspectRatio; } } else if (viewMode === 3) { canvasHeight = containerData.width / aspectRatio; } else { canvasWidth = containerData.height * aspectRatio; } var canvasData = { aspectRatio: aspectRatio, naturalWidth: naturalWidth, naturalHeight: naturalHeight, width: canvasWidth, height: canvasHeight }; canvasData.left = (containerData.width - canvasWidth) / 2; canvasData.top = (containerData.height - canvasHeight) / 2; canvasData.oldLeft = canvasData.left; canvasData.oldTop = canvasData.top; this.canvasData = canvasData; this.limited = viewMode === 1 || viewMode === 2; this.limitCanvas(true, true); this.initialImageData = assign({}, imageData); this.initialCanvasData = assign({}, canvasData); }, limitCanvas: function limitCanvas(sizeLimited, positionLimited) { var options = this.options, containerData = this.containerData, canvasData = this.canvasData, cropBoxData = this.cropBoxData; var viewMode = options.viewMode; var aspectRatio = canvasData.aspectRatio; var cropped = this.cropped && cropBoxData; if (sizeLimited) { var minCanvasWidth = Number(options.minCanvasWidth) || 0; var minCanvasHeight = Number(options.minCanvasHeight) || 0; if (viewMode > 1) { minCanvasWidth = Math.max(minCanvasWidth, containerData.width); minCanvasHeight = Math.max(minCanvasHeight, containerData.height); if (viewMode === 3) { if (minCanvasHeight * aspectRatio > minCanvasWidth) { minCanvasWidth = minCanvasHeight * aspectRatio; } else { minCanvasHeight = minCanvasWidth / aspectRatio; } } } else if (viewMode > 0) { if (minCanvasWidth) { minCanvasWidth = Math.max(minCanvasWidth, cropped ? cropBoxData.width : 0); } else if (minCanvasHeight) { minCanvasHeight = Math.max(minCanvasHeight, cropped ? cropBoxData.height : 0); } else if (cropped) { minCanvasWidth = cropBoxData.width; minCanvasHeight = cropBoxData.height; if (minCanvasHeight * aspectRatio > minCanvasWidth) { minCanvasWidth = minCanvasHeight * aspectRatio; } else { minCanvasHeight = minCanvasWidth / aspectRatio; } } } var _getAdjustedSizes = getAdjustedSizes({ aspectRatio: aspectRatio, width: minCanvasWidth, height: minCanvasHeight }); minCanvasWidth = _getAdjustedSizes.width; minCanvasHeight = _getAdjustedSizes.height; canvasData.minWidth = minCanvasWidth; canvasData.minHeight = minCanvasHeight; canvasData.maxWidth = Infinity; canvasData.maxHeight = Infinity; } if (positionLimited) { if (viewMode > (cropped ? 0 : 1)) { var newCanvasLeft = containerData.width - canvasData.width; var newCanvasTop = containerData.height - canvasData.height; canvasData.minLeft = Math.min(0, newCanvasLeft); canvasData.minTop = Math.min(0, newCanvasTop); canvasData.maxLeft = Math.max(0, newCanvasLeft); canvasData.maxTop = Math.max(0, newCanvasTop); if (cropped && this.limited) { canvasData.minLeft = Math.min(cropBoxData.left, cropBoxData.left + (cropBoxData.width - canvasData.width)); canvasData.minTop = Math.min(cropBoxData.top, cropBoxData.top + (cropBoxData.height - canvasData.height)); canvasData.maxLeft = cropBoxData.left; canvasData.maxTop = cropBoxData.top; if (viewMode === 2) { if (canvasData.width >= containerData.width) { canvasData.minLeft = Math.min(0, newCanvasLeft); canvasData.maxLeft = Math.max(0, newCanvasLeft); } if (canvasData.height >= containerData.height) { canvasData.minTop = Math.min(0, newCanvasTop); canvasData.maxTop = Math.max(0, newCanvasTop); } } } } else { canvasData.minLeft = -canvasData.width; canvasData.minTop = -canvasData.height; canvasData.maxLeft = containerData.width; canvasData.maxTop = containerData.height; } } }, renderCanvas: function renderCanvas(changed, transformed) { var canvasData = this.canvasData, imageData = this.imageData; if (transformed) { var _getRotatedSizes = getRotatedSizes({ width: imageData.naturalWidth * Math.abs(imageData.scaleX || 1), height: imageData.naturalHeight * Math.abs(imageData.scaleY || 1), degree: imageData.rotate || 0 }), naturalWidth = _getRotatedSizes.width, naturalHeight = _getRotatedSizes.height; var width = canvasData.width * (naturalWidth / canvasData.naturalWidth); var height = canvasData.height * (naturalHeight / canvasData.naturalHeight); canvasData.left -= (width - canvasData.width) / 2; canvasData.top -= (height - canvasData.height) / 2; canvasData.width = width; canvasData.height = height; canvasData.aspectRatio = naturalWidth / naturalHeight; canvasData.naturalWidth = naturalWidth; canvasData.naturalHeight = naturalHeight; this.limitCanvas(true, false); } if (canvasData.width > canvasData.maxWidth || canvasData.width < canvasData.minWidth) { canvasData.left = canvasData.oldLeft; } if (canvasData.height > canvasData.maxHeight || canvasData.height < canvasData.minHeight) { canvasData.top = canvasData.oldTop; } canvasData.width = Math.min(Math.max(canvasData.width, canvasData.minWidth), canvasData.maxWidth); canvasData.height = Math.min(Math.max(canvasData.height, canvasData.minHeight), canvasData.maxHeight); this.limitCanvas(false, true); canvasData.left = Math.min(Math.max(canvasData.left, canvasData.minLeft), canvasData.maxLeft); canvasData.top = Math.min(Math.max(canvasData.top, canvasData.minTop), canvasData.maxTop); canvasData.oldLeft = canvasData.left; canvasData.oldTop = canvasData.top; setStyle(this.canvas, assign({ width: canvasData.width, height: canvasData.height }, getTransforms({ translateX: canvasData.left, translateY: canvasData.top }))); this.renderImage(changed); if (this.cropped && this.limited) { this.limitCropBox(true, true); } }, renderImage: function renderImage(changed) { var canvasData = this.canvasData, imageData = this.imageData; var width = imageData.naturalWidth * (canvasData.width / canvasData.naturalWidth); var height = imageData.naturalHeight * (canvasData.height / canvasData.naturalHeight); assign(imageData, { width: width, height: height, left: (canvasData.width - width) / 2, top: (canvasData.height - height) / 2 }); setStyle(this.image, assign({ width: imageData.width, height: imageData.height }, getTransforms(assign({ translateX: imageData.left, translateY: imageData.top }, imageData)))); if (changed) { this.output(); } }, initCropBox: function initCropBox() { var options = this.options, canvasData = this.canvasData; var aspectRatio = options.aspectRatio || options.initialAspectRatio; var autoCropArea = Number(options.autoCropArea) || 0.8; var cropBoxData = { width: canvasData.width, height: canvasData.height }; if (aspectRatio) { if (canvasData.height * aspectRatio > canvasData.width) { cropBoxData.height = cropBoxData.width / aspectRatio; } else { cropBoxData.width = cropBoxData.height * aspectRatio; } } this.cropBoxData = cropBoxData; this.limitCropBox(true, true); // Initialize auto crop area cropBoxData.width = Math.min(Math.max(cropBoxData.width, cropBoxData.minWidth), cropBoxData.maxWidth); cropBoxData.height = Math.min(Math.max(cropBoxData.height, cropBoxData.minHeight), cropBoxData.maxHeight); // The width/height of auto crop area must large than "minWidth/Height" cropBoxData.width = Math.max(cropBoxData.minWidth, cropBoxData.width * autoCropArea); cropBoxData.height = Math.max(cropBoxData.minHeight, cropBoxData.height * autoCropArea); cropBoxData.left = canvasData.left + (canvasData.width - cropBoxData.width) / 2; cropBoxData.top = canvasData.top + (canvasData.height - cropBoxData.height) / 2; cropBoxData.oldLeft = cropBoxData.left; cropBoxData.oldTop = cropBoxData.top; this.initialCropBoxData = assign({}, cropBoxData); }, limitCropBox: function limitCropBox(sizeLimited, positionLimited) { var options = this.options, containerData = this.containerData, canvasData = this.canvasData, cropBoxData = this.cropBoxData, limited = this.limited; var aspectRatio = options.aspectRatio; if (sizeLimited) { var minCropBoxWidth = Number(options.minCropBoxWidth) || 0; var minCropBoxHeight = Number(options.minCropBoxHeight) || 0; var maxCropBoxWidth = limited ? Math.min(containerData.width, canvasData.width, canvasData.width + canvasData.left, containerData.width - canvasData.left) : containerData.width; var maxCropBoxHeight = limited ? Math.min(containerData.height, canvasData.height, canvasData.height + canvasData.top, containerData.height - canvasData.top) : containerData.height; // The min/maxCropBoxWidth/Height must be less than container's width/height minCropBoxWidth = Math.min(minCropBoxWidth, containerData.width); minCropBoxHeight = Math.min(minCropBoxHeight, containerData.height); if (aspectRatio) { if (minCropBoxWidth && minCropBoxHeight) { if (minCropBoxHeight * aspectRatio > minCropBoxWidth) { minCropBoxHeight = minCropBoxWidth / aspectRatio; } else { minCropBoxWidth = minCropBoxHeight * aspectRatio; } } else if (minCropBoxWidth) { minCropBoxHeight = minCropBoxWidth / aspectRatio; } else if (minCropBoxHeight) { minCropBoxWidth = minCropBoxHeight * aspectRatio; } if (maxCropBoxHeight * aspectRatio > maxCropBoxWidth) { maxCropBoxHeight = maxCropBoxWidth / aspectRatio; } else { maxCropBoxWidth = maxCropBoxHeight * aspectRatio; } } // The minWidth/Height must be less than maxWidth/Height cropBoxData.minWidth = Math.min(minCropBoxWidth, maxCropBoxWidth); cropBoxData.minHeight = Math.min(minCropBoxHeight, maxCropBoxHeight); cropBoxData.maxWidth = maxCropBoxWidth; cropBoxData.maxHeight = maxCropBoxHeight; } if (positionLimited) { if (limited) { cropBoxData.minLeft = Math.max(0, canvasData.left); cropBoxData.minTop = Math.max(0, canvasData.top); cropBoxData.maxLeft = Math.min(containerData.width, canvasData.left + canvasData.width) - cropBoxData.width; cropBoxData.maxTop = Math.min(containerData.height, canvasData.top + canvasData.height) - cropBoxData.height; } else { cropBoxData.minLeft = 0; cropBoxData.minTop = 0; cropBoxData.maxLeft = containerData.width - cropBoxData.width; cropBoxData.maxTop = containerData.height - cropBoxData.height; } } }, renderCropBox: function renderCropBox() { var options = this.options, containerData = this.containerData, cropBoxData = this.cropBoxData; if (cropBoxData.width > cropBoxData.maxWidth || cropBoxData.width < cropBoxData.minWidth) { cropBoxData.left = cropBoxData.oldLeft; } if (cropBoxData.height > cropBoxData.maxHeight || cropBoxData.height < cropBoxData.minHeight) { cropBoxData.top = cropBoxData.oldTop; } cropBoxData.width = Math.min(Math.max(cropBoxData.width, cropBoxData.minWidth), cropBoxData.maxWidth); cropBoxData.height = Math.min(Math.max(cropBoxData.height, cropBoxData.minHeight), cropBoxData.maxHeight); this.limitCropBox(false, true); cropBoxData.left = Math.min(Math.max(cropBoxData.left, cropBoxData.minLeft), cropBoxData.maxLeft); cropBoxData.top = Math.min(Math.max(cropBoxData.top, cropBoxData.minTop), cropBoxData.maxTop); cropBoxData.oldLeft = cropBoxData.left; cropBoxData.oldTop = cropBoxData.top; if (options.movable && options.cropBoxMovable) { // Turn to move the canvas when the crop box is equal to the container setData(this.face, DATA_ACTION, cropBoxData.width >= containerData.width && cropBoxData.height >= containerData.height ? ACTION_MOVE : ACTION_ALL); } setStyle(this.cropBox, assign({ width: cropBoxData.width, height: cropBoxData.height }, getTransforms({ translateX: cropBoxData.left, translateY: cropBoxData.top }))); if (this.cropped && this.limited) { this.limitCanvas(true, true); } if (!this.disabled) { this.output(); } }, output: function output() { this.preview(); dispatchEvent(this.element, EVENT_CROP, this.getData()); } }; var preview = { initPreview: function initPreview() { var crossOrigin = this.crossOrigin; var preview = this.options.preview; var url = crossOrigin ? this.crossOriginUrl : this.url; var image = document.createElement('img'); if (crossOrigin) { image.crossOrigin = crossOrigin; } image.src = url; this.viewBox.appendChild(image); this.viewBoxImage = image; if (!preview) { return; } var previews = preview; if (typeof preview === 'string') { previews = this.element.ownerDocument.querySelectorAll(preview); } else if (preview.querySelector) { previews = [preview]; } this.previews = previews; forEach(previews, function (el) { var img = document.createElement('img'); // Save the original size for recover setData(el, DATA_PREVIEW, { width: el.offsetWidth, height: el.offsetHeight, html: el.innerHTML }); if (crossOrigin) { img.crossOrigin = crossOrigin; } img.src = url; /** * Override img element styles * Add `display:block` to avoid margin top issue * Add `height:auto` to override `height` attribute on IE8 * (Occur only when margin-top <= -height) */ img.style.cssText = 'display:block;' + 'width:100%;' + 'height:auto;' + 'min-width:0!important;' + 'min-height:0!important;' + 'max-width:none!important;' + 'max-height:none!important;' + 'image-orientation:0deg!important;"'; el.innerHTML = ''; el.appendChild(img); }); }, resetPreview: function resetPreview() { forEach(this.previews, function (element) { var data = getData(element, DATA_PREVIEW); setStyle(element, { width: data.width, height: data.height }); element.innerHTML = data.html; removeData(element, DATA_PREVIEW); }); }, preview: function preview() { var imageData = this.imageData, canvasData = this.canvasData, cropBoxData = this.cropBoxData; var cropBoxWidth = cropBoxData.width, cropBoxHeight = cropBoxData.height; var width = imageData.width, height = imageData.height; var left = cropBoxData.left - canvasData.left - imageData.left; var top = cropBoxData.top - canvasData.top - imageData.top; if (!this.cropped || this.disabled) { return; } setStyle(this.viewBoxImage, assign({ width: width, height: height }, getTransforms(assign({ translateX: -left, translateY: -top }, imageData)))); forEach(this.previews, function (element) { var data = getData(element, DATA_PREVIEW); var originalWidth = data.width; var originalHeight = data.height; var newWidth = originalWidth; var newHeight = originalHeight; var ratio = 1; if (cropBoxWidth) { ratio = originalWidth / cropBoxWidth; newHeight = cropBoxHeight * ratio; } if (cropBoxHeight && newHeight > originalHeight) { ratio = originalHeight / cropBoxHeight; newWidth = cropBoxWidth * ratio; newHeight = originalHeight; } setStyle(element, { width: newWidth, height: newHeight }); setStyle(element.getElementsByTagName('img')[0], assign({ width: width * ratio, height: height * ratio }, getTransforms(assign({ translateX: -left * ratio, translateY: -top * ratio }, imageData)))); }); } }; var events = { bind: function bind() { var element = this.element, options = this.options, cropper = this.cropper; if (isFunction(options.cropstart)) { addListener(element, EVENT_CROP_START, options.cropstart); } if (isFunction(options.cropmove)) { addListener(element, EVENT_CROP_MOVE, options.cropmove); } if (isFunction(options.cropend)) { addListener(element, EVENT_CROP_END, options.cropend); } if (isFunction(options.crop)) { addListener(element, EVENT_CROP, options.crop); } if (isFunction(options.zoom)) { addListener(element, EVENT_ZOOM, options.zoom); } addListener(cropper, EVENT_POINTER_DOWN, this.onCropStart = this.cropStart.bind(this)); if (options.zoomable && options.zoomOnWheel) { addListener(cropper, EVENT_WHEEL, this.onWheel = this.wheel.bind(this)); } if (options.toggleDragModeOnDblclick) { addListener(cropper, EVENT_DBLCLICK, this.onDblclick = this.dblclick.bind(this)); } addListener(element.ownerDocument, EVENT_POINTER_MOVE, this.onCropMove = this.cropMove.bind(this)); addListener(element.ownerDocument, EVENT_POINTER_UP, this.onCropEnd = this.cropEnd.bind(this)); if (options.responsive) { addListener(window, EVENT_RESIZE, this.onResize = this.resize.bind(this)); } }, unbind: function unbind() { var element = this.element, options = this.options, cropper = this.cropper; if (isFunction(options.cropstart)) { removeListener(element, EVENT_CROP_START, options.cropstart); } if (isFunction(options.cropmove)) { removeListener(element, EVENT_CROP_MOVE, options.cropmove); } if (isFunction(options.cropend)) { removeListener(element, EVENT_CROP_END, options.cropend); } if (isFunction(options.crop)) { removeListener(element, EVENT_CROP, options.crop); } if (isFunction(options.zoom)) { removeListener(element, EVENT_ZOOM, options.zoom); } removeListener(cropper, EVENT_POINTER_DOWN, this.onCropStart); if (options.zoomable && options.zoomOnWheel) { removeListener(cropper, EVENT_WHEEL, this.onWheel); } if (options.toggleDragModeOnDblclick) { removeListener(cropper, EVENT_DBLCLICK, this.onDblclick); } removeListener(element.ownerDocument, EVENT_POINTER_MOVE, this.onCropMove); removeListener(element.ownerDocument, EVENT_POINTER_UP, this.onCropEnd); if (options.responsive) { removeListener(window, EVENT_RESIZE, this.onResize); } } }; var handlers = { resize: function resize() { var options = this.options, container = this.container, containerData = this.containerData; var minContainerWidth = Number(options.minContainerWidth) || 200; var minContainerHeight = Number(options.minContainerHeight) || 100; if (this.disabled || containerData.width <= minContainerWidth || containerData.height <= minContainerHeight) { return; } var ratio = container.offsetWidth / containerData.width; // Resize when width changed or height changed if (ratio !== 1 || container.offsetHeight !== containerData.height) { var canvasData; var cropBoxData; if (options.restore) { canvasData = this.getCanvasData(); cropBoxData = this.getCropBoxData(); } this.render(); if (options.restore) { this.setCanvasData(forEach(canvasData, function (n, i) { canvasData[i] = n * ratio; })); this.setCropBoxData(forEach(cropBoxData, function (n, i) { cropBoxData[i] = n * ratio; })); } } }, dblclick: function dblclick() { if (this.disabled || this.options.dragMode === DRAG_MODE_NONE) { return; } this.setDragMode(hasClass(this.dragBox, CLASS_CROP) ? DRAG_MODE_MOVE : DRAG_MODE_CROP); }, wheel: function wheel(e) { var _this = this; var ratio = Number(this.options.wheelZoomRatio) || 0.1; var delta = 1; if (this.disabled) { return; } e.preventDefault(); // Limit wheel speed to prevent zoom too fast (#21) if (this.wheeling) { return; } this.wheeling = true; setTimeout(function () { _this.wheeling = false; }, 50); if (e.deltaY) { delta = e.deltaY > 0 ? 1 : -1; } else if (e.wheelDelta) { delta = -e.wheelDelta / 120; } else if (e.detail) { delta = e.detail > 0 ? 1 : -1; } this.zoom(-delta * ratio, e); }, cropStart: function cropStart(e) { if (this.disabled) { return; } var options = this.options, pointers = this.pointers; var action; if (e.changedTouches) { // Handle touch event forEach(e.changedTouches, function (touch) { pointers[touch.identifier] = getPointer(touch); }); } else { // Handle mouse event and pointer event pointers[e.pointerId || 0] = getPointer(e); } if (Object.keys(pointers).length > 1 && options.zoomable && options.zoomOnTouch) { action = ACTION_ZOOM; } else { action = getData(e.target, DATA_ACTION); } if (!REGEXP_ACTIONS.test(action)) { return; } if (dispatchEvent(this.element, EVENT_CROP_START, { originalEvent: e, action: action }) === false) { return; } // This line is required for preventing page zooming in iOS browsers e.preventDefault(); this.action = action; this.cropping = false; if (action === ACTION_CROP) { this.cropping = true; addClass(this.dragBox, CLASS_MODAL); } }, cropMove: function cropMove(e) { var action = this.action; if (this.disabled || !action) { return; } var pointers = this.pointers; e.preventDefault(); if (dispatchEvent(this.element, EVENT_CROP_MOVE, { originalEvent: e, action: action }) === false) { return; } if (e.changedTouches) { forEach(e.changedTouches, function (touch) { // The first parameter should not be undefined (#432) assign(pointers[touch.identifier] || {}, getPointer(touch, true)); }); } else { assign(pointers[e.pointerId || 0] || {}, getPointer(e, true)); } this.change(e); }, cropEnd: function cropEnd(e) { if (this.disabled) { return; } var action = this.action, pointers = this.pointers; if (e.changedTouches) { forEach(e.changedTouches, function (touch) { delete pointers[touch.identifier]; }); } else { delete pointers[e.pointerId || 0]; } if (!action) { return; } e.preventDefault(); if (!Object.keys(pointers).length) { this.action = ''; } if (this.cropping) { this.cropping = false; toggleClass(this.dragBox, CLASS_MODAL, this.cropped && this.options.modal); } dispatchEvent(this.element, EVENT_CROP_END, { originalEvent: e, action: action }); } }; var change = { change: function change(e) { var options = this.options, canvasData = this.canvasData, containerData = this.containerData, cropBoxData = this.cropBoxData, pointers = this.pointers; var action = this.action; var aspectRatio = options.aspectRatio; var left = cropBoxData.left, top = cropBoxData.top, width = cropBoxData.width, height = cropBoxData.height; var right = left + width; var bottom = top + height; var minLeft = 0; var minTop = 0; var maxWidth = containerData.width; var maxHeight = containerData.height; var renderable = true; var offset; // Locking aspect ratio in "free mode" by holding shift key if (!aspectRatio && e.shiftKey) { aspectRatio = width && height ? width / height : 1; } if (this.limited) { minLeft = cropBoxData.minLeft; minTop = cropBoxData.minTop; maxWidth = minLeft + Math.min(containerData.width, canvasData.width, canvasData.left + canvasData.width); maxHeight = minTop + Math.min(containerData.height, canvasData.height, canvasData.top + canvasData.height); } var pointer = pointers[Object.keys(pointers)[0]]; var range = { x: pointer.endX - pointer.startX, y: pointer.endY - pointer.startY }; var check = function check(side) { switch (side) { case ACTION_EAST: if (right + range.x > maxWidth) { range.x = maxWidth - right; } break; case ACTION_WEST: if (left + range.x < minLeft) { range.x = minLeft - left; } break; case ACTION_NORTH: if (top + range.y < minTop) { range.y = minTop - top; } break; case ACTION_SOUTH: if (bottom + range.y > maxHeight) { range.y = maxHeight - bottom; } break; default: } }; switch (action) { // Move crop box case ACTION_ALL: left += range.x; top += range.y; break; // Resize crop box case ACTION_EAST: if (range.x >= 0 && (right >= maxWidth || aspectRatio && (top <= minTop || bottom >= maxHeight))) { renderable = false; break; } check(ACTION_EAST); width += range.x; if (width < 0) { action = ACTION_WEST; width = -width; left -= width; } if (aspectRatio) { height = width / aspectRatio; top += (cropBoxData.height - height) / 2; } break; case ACTION_NORTH: if (range.y <= 0 && (top <= minTop || aspectRatio && (left <= minLeft || right >= maxWidth))) { renderable = false; break; } check(ACTION_NORTH); height -= range.y; top += range.y; if (height < 0) { action = ACTION_SOUTH; height = -height; top -= height; } if (aspectRatio) { width = height * aspectRatio; left += (cropBoxData.width - width) / 2; } break; case ACTION_WEST: if (range.x <= 0 && (left <= minLeft || aspectRatio && (top <= minTop || bottom >= maxHeight))) { renderable = false; break; } check(ACTION_WEST); width -= range.x; left += range.x; if (width < 0) { action = ACTION_EAST; width = -width; left -= width; } if (aspectRatio) { height = width / aspectRatio; top += (cropBoxData.height - height) / 2; } break; case ACTION_SOUTH: if (range.y >= 0 && (bottom >= maxHeight || aspectRatio && (left <= minLeft || right >= maxWidth))) { renderable = false; break; } check(ACTION_SOUTH); height += range.y; if (height < 0) { action = ACTION_NORTH; height = -height; top -= height; } if (aspectRatio) { width = height * aspectRatio; left += (cropBoxData.width - width) / 2; } break; case ACTION_NORTH_EAST: if (aspectRatio) { if (range.y <= 0 && (top <= minTop || right >= maxWidth)) { renderable = false; break; } check(ACTION_NORTH); height -= range.y; top += range.y; width = height * aspectRatio; } else { check(ACTION_NORTH); check(ACTION_EAST); if (range.x >= 0) { if (right < maxWidth) { width += range.x; } else if (range.y <= 0 && top <= minTop) { renderable = false; } } else { width += range.x; } if (range.y <= 0) { if (top > minTop) { height -= range.y; top += range.y; } } else { height -= range.y; top += range.y; } } if (width < 0 && height < 0) { action = ACTION_SOUTH_WEST; height = -height; width = -width; top -= height; left -= width; } else if (width < 0) { action = ACTION_NORTH_WEST; width = -width; left -= width; } else if (height < 0) { action = ACTION_SOUTH_EAST; height = -height; top -= height; } break; case ACTION_NORTH_WEST: if (aspectRatio) { if (range.y <= 0 && (top <= minTop || left <= minLeft)) { renderable = false; break; } check(ACTION_NORTH); height -= range.y; top += range.y; width = height * aspectRatio; left += cropBoxData.width - width; } else { check(ACTION_NORTH); check(ACTION_WEST); if (range.x <= 0) { if (left > minLeft) { width -= range.x; left += range.x; } else if (range.y <= 0 && top <= minTop) { renderable = false; } } else { width -= range.x; left += range.x; } if (range.y <= 0) { if (top > minTop) { height -= range.y; top += range.y; } } else { height -= range.y; top += range.y; } } if (width < 0 && height < 0) { action = ACTION_SOUTH_EAST; height = -height; width = -width; top -= height; left -= width; } else if (width < 0) { action = ACTION_NORTH_EAST; width = -width; left -= width; } else if (height < 0) { action = ACTION_SOUTH_WEST; height = -height; top -= height; } break; case ACTION_SOUTH_WEST: if (aspectRatio) { if (range.x <= 0 && (left <= minLeft || bottom >= maxHeight)) { renderable = false; break; } check(ACTION_WEST); width -= range.x; left += range.x; height = width / aspectRatio; } else { check(ACTION_SOUTH); check(ACTION_WEST); if (range.x <= 0) { if (left > minLeft) { width -= range.x; left += range.x; } else if (range.y >= 0 && bottom >= maxHeight) { renderable = false; } } else { width -= range.x; left += range.x; } if (range.y >= 0) { if (bottom < maxHeight) { height += range.y; } } else { height += range.y; } } if (width < 0 && height < 0) { action = ACTION_NORTH_EAST; height = -height; width = -width; top -= height; left -= width; } else if (width < 0) { action = ACTION_SOUTH_EAST; width = -width; left -= width; } else if (height < 0) { action = ACTION_NORTH_WEST; height = -height; top -= height; } break; case ACTION_SOUTH_EAST: if (aspectRatio) { if (range.x >= 0 && (right >= maxWidth || bottom >= maxHeight)) { renderable = false; break; } check(ACTION_EAST); width += range.x; height = width / aspectRatio; } else { check(ACTION_SOUTH); check(ACTION_EAST); if (range.x >= 0) { if (right < maxWidth) { width += range.x; } else if (range.y >= 0 && bottom >= maxHeight) { renderable = false; } } else { width += range.x; } if (range.y >= 0) { if (bottom < maxHeight) { height += range.y; } } else { height += range.y; } } if (width < 0 && height < 0) { action = ACTION_NORTH_WEST; height = -height; width = -width; top -= height; left -= width; } else if (width < 0) { action = ACTION_SOUTH_WEST; width = -width; left -= width; } else if (height < 0) { action = ACTION_NORTH_EAST; height = -height; top -= height; } break; // Move canvas case ACTION_MOVE: this.move(range.x, range.y); renderable = false; break; // Zoom canvas case ACTION_ZOOM: this.zoom(getMaxZoomRatio(pointers), e); renderable = false; break; // Create crop box case ACTION_CROP: if (!range.x || !range.y) { renderable = false; break; } offset = getOffset(this.cropper); left = pointer.startX - offset.left; top = pointer.startY - offset.top; width = cropBoxData.minWidth; height = cropBoxData.minHeight; if (range.x > 0) { action = range.y > 0 ? ACTION_SOUTH_EAST : ACTION_NORTH_EAST; } else if (range.x < 0) { left -= width; action = range.y > 0 ? ACTION_SOUTH_WEST : ACTION_NORTH_WEST; } if (range.y < 0) { top -= height; } // Show the crop box if is hidden if (!this.cropped) { removeClass(this.cropBox, CLASS_HIDDEN); this.cropped = true; if (this.limited) { this.limitCropBox(true, true); } } break; default: } if (renderable) { cropBoxData.width = width; cropBoxData.height = height; cropBoxData.left = left; cropBoxData.top = top; this.action = action; this.renderCropBox(); } // Override forEach(pointers, function (p) { p.startX = p.endX; p.startY = p.endY; }); } }; var methods = { // Show the crop box manually crop: function crop() { if (this.ready && !this.cropped && !this.disabled) { this.cropped = true; this.limitCropBox(true, true); if (this.options.modal) { addClass(this.dragBox, CLASS_MODAL); } removeClass(this.cropBox, CLASS_HIDDEN); this.setCropBoxData(this.initialCropBoxData); } return this; }, // Reset the image and crop box to their initial states reset: function reset() { if (this.ready && !this.disabled) { this.imageData = assign({}, this.initialImageData); this.canvasData = assign({}, this.initialCanvasData); this.cropBoxData = assign({}, this.initialCropBoxData); this.renderCanvas(); if (this.cropped) { this.renderCropBox(); } } return this; }, // Clear the crop box clear: function clear() { if (this.cropped && !this.disabled) { assign(this.cropBoxData, { left: 0, top: 0, width: 0, height: 0 }); this.cropped = false; this.renderCropBox(); this.limitCanvas(true, true); // Render canvas after crop box rendered this.renderCanvas(); removeClass(this.dragBox, CLASS_MODAL); addClass(this.cropBox, CLASS_HIDDEN); } return this; }, /** * Replace the image's src and rebuild the cropper * @param {string} url - The new URL. * @param {boolean} [hasSameSize] - Indicate if the new image has the same size as the old one. * @returns {Cropper} this */ replace: function replace(url) { var hasSameSize = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false; if (!this.disabled && url) { if (this.isImg) { this.element.src = url; } if (hasSameSize) { this.url = url; this.image.src = url; if (this.ready) { this.viewBoxImage.src = url; forEach(this.previews, function (element) { element.getElementsByTagName('img')[0].src = url; }); } } else { if (this.isImg) { this.replaced = true; } this.options.data = null; this.uncreate(); this.load(url); } } return this; }, // Enable (unfreeze) the cropper enable: function enable() { if (this.ready && this.disabled) { this.disabled = false; removeClass(this.cropper, CLASS_DISABLED); } return this; }, // Disable (freeze) the cropper disable: function disable() { if (this.ready && !this.disabled) { this.disabled = true; addClass(this.cropper, CLASS_DISABLED); } return this; }, /** * Destroy the cropper and remove the instance from the image * @returns {Cropper} this */ destroy: function destroy() { var element = this.element; if (!element[NAMESPACE]) { return this; } element[NAMESPACE] = undefined; if (this.isImg && this.replaced) { element.src = this.originalUrl; } this.uncreate(); return this; }, /** * Move the canvas with relative offsets * @param {number} offsetX - The relative offset distance on the x-axis. * @param {number} [offsetY=offsetX] - The relative offset distance on the y-axis. * @returns {Cropper} this */ move: function move(offsetX) { var offsetY = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : offsetX; var _this$canvasData = this.canvasData, left = _this$canvasData.left, top = _this$canvasData.top; return this.moveTo(isUndefined(offsetX) ? offsetX : left + Number(offsetX), isUndefined(offsetY) ? offsetY : top + Number(offsetY)); }, /** * Move the canvas to an absolute point * @param {number} x - The x-axis coordinate. * @param {number} [y=x] - The y-axis coordinate. * @returns {Cropper} this */ moveTo: function moveTo(x) { var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x; var canvasData = this.canvasData; var changed = false; x = Number(x); y = Number(y); if (this.ready && !this.disabled && this.options.movable) { if (isNumber(x)) { canvasData.left = x; changed = true; } if (isNumber(y)) { canvasData.top = y; changed = true; } if (changed) { this.renderCanvas(true); } } return this; }, /** * Zoom the canvas with a relative ratio * @param {number} ratio - The target ratio. * @param {Event} _originalEvent - The original event if any. * @returns {Cropper} this */ zoom: function zoom(ratio, _originalEvent) { var canvasData = this.canvasData; ratio = Number(ratio); if (ratio < 0) { ratio = 1 / (1 - ratio); } else { ratio = 1 + ratio; } return this.zoomTo(canvasData.width * ratio / canvasData.naturalWidth, null, _originalEvent); }, /** * Zoom the canvas to an absolute ratio * @param {number} ratio - The target ratio. * @param {Object} pivot - The zoom pivot point coordinate. * @param {Event} _originalEvent - The original event if any. * @returns {Cropper} this */ zoomTo: function zoomTo(ratio, pivot, _originalEvent) { var options = this.options, canvasData = this.canvasData; var width = canvasData.width, height = canvasData.height, naturalWidth = canvasData.naturalWidth, naturalHeight = canvasData.naturalHeight; ratio = Number(ratio); if (ratio >= 0 && this.ready && !this.disabled && options.zoomable) { var newWidth = naturalWidth * ratio; var newHeight = naturalHeight * ratio; if (dispatchEvent(this.element, EVENT_ZOOM, { ratio: ratio, oldRatio: width / naturalWidth, originalEvent: _originalEvent }) === false) { return this; } if (_originalEvent) { var pointers = this.pointers; var offset = getOffset(this.cropper); var center = pointers && Object.keys(pointers).length ? getPointersCenter(pointers) : { pageX: _originalEvent.pageX, pageY: _originalEvent.pageY }; // Zoom from the triggering point of the event canvasData.left -= (newWidth - width) * ((center.pageX - offset.left - canvasData.left) / width); canvasData.top -= (newHeight - height) * ((center.pageY - offset.top - canvasData.top) / height); } else if (isPlainObject(pivot) && isNumber(pivot.x) && isNumber(pivot.y)) { canvasData.left -= (newWidth - width) * ((pivot.x - canvasData.left) / width); canvasData.top -= (newHeight - height) * ((pivot.y - canvasData.top) / height); } else { // Zoom from the center of the canvas canvasData.left -= (newWidth - width) / 2; canvasData.top -= (newHeight - height) / 2; } canvasData.width = newWidth; canvasData.height = newHeight; this.renderCanvas(true); } return this; }, /** * Rotate the canvas with a relative degree * @param {number} degree - The rotate degree. * @returns {Cropper} this */ rotate: function rotate(degree) { return this.rotateTo((this.imageData.rotate || 0) + Number(degree)); }, /** * Rotate the canvas to an absolute degree * @param {number} degree - The rotate degree. * @returns {Cropper} this */ rotateTo: function rotateTo(degree) { degree = Number(degree); if (isNumber(degree) && this.ready && !this.disabled && this.options.rotatable) { this.imageData.rotate = degree % 360; this.renderCanvas(true, true); } return this; }, /** * Scale the image on the x-axis. * @param {number} scaleX - The scale ratio on the x-axis. * @returns {Cropper} this */ scaleX: function scaleX(_scaleX) { var scaleY = this.imageData.scaleY; return this.scale(_scaleX, isNumber(scaleY) ? scaleY : 1); }, /** * Scale the image on the y-axis. * @param {number} scaleY - The scale ratio on the y-axis. * @returns {Cropper} this */ scaleY: function scaleY(_scaleY) { var scaleX = this.imageData.scaleX; return this.scale(isNumber(scaleX) ? scaleX : 1, _scaleY); }, /** * Scale the image * @param {number} scaleX - The scale ratio on the x-axis. * @param {number} [scaleY=scaleX] - The scale ratio on the y-axis. * @returns {Cropper} this */ scale: function scale(scaleX) { var scaleY = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : scaleX; var imageData = this.imageData; var transformed = false; scaleX = Number(scaleX); scaleY = Number(scaleY); if (this.ready && !this.disabled && this.options.scalable) { if (isNumber(scaleX)) { imageData.scaleX = scaleX; transformed = true; } if (isNumber(scaleY)) { imageData.scaleY = scaleY; transformed = true; } if (transformed) { this.renderCanvas(true, true); } } return this; }, /** * Get the cropped area position and size data (base on the original image) * @param {boolean} [rounded=false] - Indicate if round the data values or not. * @returns {Object} The result cropped data. */ getData: function getData$$1() { var rounded = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false; var options = this.options, imageData = this.imageData, canvasData = this.canvasData, cropBoxData = this.cropBoxData; var data; if (this.ready && this.cropped) { data = { x: cropBoxData.left - canvasData.left, y: cropBoxData.top - canvasData.top, width: cropBoxData.width, height: cropBoxData.height }; var ratio = imageData.width / imageData.naturalWidth; forEach(data, function (n, i) { data[i] = n / ratio; }); if (rounded) { // In case rounding off leads to extra 1px in right or bottom border // we should round the top-left corner and the dimension (#343). var bottom = Math.round(data.y + data.height); var right = Math.round(data.x + data.width); data.x = Math.round(data.x); data.y = Math.round(data.y); data.width = right - data.x; data.height = bottom - data.y; } } else { data = { x: 0, y: 0, width: 0, height: 0 }; } if (options.rotatable) { data.rotate = imageData.rotate || 0; } if (options.scalable) { data.scaleX = imageData.scaleX || 1; data.scaleY = imageData.scaleY || 1; } return data; }, /** * Set the cropped area position and size with new data * @param {Object} data - The new data. * @returns {Cropper} this */ setData: function setData$$1(data) { var options = this.options, imageData = this.imageData, canvasData = this.canvasData; var cropBoxData = {}; if (this.ready && !this.disabled && isPlainObject(data)) { var transformed = false; if (options.rotatable) { if (isNumber(data.rotate) && data.rotate !== imageData.rotate) { imageData.rotate = data.rotate; transformed = true; } } if (options.scalable) { if (isNumber(data.scaleX) && data.scaleX !== imageData.scaleX) { imageData.scaleX = data.scaleX; transformed = true; } if (isNumber(data.scaleY) && data.scaleY !== imageData.scaleY) { imageData.scaleY = data.scaleY; transformed = true; } } if (transformed) { this.renderCanvas(true, true); } var ratio = imageData.width / imageData.naturalWidth; if (isNumber(data.x)) { cropBoxData.left = data.x * ratio + canvasData.left; } if (isNumber(data.y)) { cropBoxData.top = data.y * ratio + canvasData.top; } if (isNumber(data.width)) { cropBoxData.width = data.width * ratio; } if (isNumber(data.height)) { cropBoxData.height = data.height * ratio; } this.setCropBoxData(cropBoxData); } return this; }, /** * Get the container size data. * @returns {Object} The result container data. */ getContainerData: function getContainerData() { return this.ready ? assign({}, this.containerData) : {}; }, /** * Get the image position and size data. * @returns {Object} The result image data. */ getImageData: function getImageData() { return this.sized ? assign({}, this.imageData) : {}; }, /** * Get the canvas position and size data. * @returns {Object} The result canvas data. */ getCanvasData: function getCanvasData() { var canvasData = this.canvasData; var data = {}; if (this.ready) { forEach(['left', 'top', 'width', 'height', 'naturalWidth', 'naturalHeight'], function (n) { data[n] = canvasData[n]; }); } return data; }, /** * Set the canvas position and size with new data. * @param {Object} data - The new canvas data. * @returns {Cropper} this */ setCanvasData: function setCanvasData(data) { var canvasData = this.canvasData; var aspectRatio = canvasData.aspectRatio; if (this.ready && !this.disabled && isPlainObject(data)) { if (isNumber(data.left)) { canvasData.left = data.left; } if (isNumber(data.top)) { canvasData.top = data.top; } if (isNumber(data.width)) { canvasData.width = data.width; canvasData.height = data.width / aspectRatio; } else if (isNumber(data.height)) { canvasData.height = data.height; canvasData.width = data.height * aspectRatio; } this.renderCanvas(true); } return this; }, /** * Get the crop box position and size data. * @returns {Object} The result crop box data. */ getCropBoxData: function getCropBoxData() { var cropBoxData = this.cropBoxData; var data; if (this.ready && this.cropped) { data = { left: cropBoxData.left, top: cropBoxData.top, width: cropBoxData.width, height: cropBoxData.height }; } return data || {}; }, /** * Set the crop box position and size with new data. * @param {Object} data - The new crop box data. * @returns {Cropper} this */ setCropBoxData: function setCropBoxData(data) { var cropBoxData = this.cropBoxData; var aspectRatio = this.options.aspectRatio; var widthChanged; var heightChanged; if (this.ready && this.cropped && !this.disabled && isPlainObject(data)) { if (isNumber(data.left)) { cropBoxData.left = data.left; } if (isNumber(data.top)) { cropBoxData.top = data.top; } if (isNumber(data.width) && data.width !== cropBoxData.width) { widthChanged = true; cropBoxData.width = data.width; } if (isNumber(data.height) && data.height !== cropBoxData.height) { heightChanged = true; cropBoxData.height = data.height; } if (aspectRatio) { if (widthChanged) { cropBoxData.height = cropBoxData.width / aspectRatio; } else if (heightChanged) { cropBoxData.width = cropBoxData.height * aspectRatio; } } this.renderCropBox(); } return this; }, /** * Get a canvas drawn the cropped image. * @param {Object} [options={}] - The config options. * @returns {HTMLCanvasElement} - The result canvas. */ getCroppedCanvas: function getCroppedCanvas() { var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {}; if (!this.ready || !window.HTMLCanvasElement) { return null; } var canvasData = this.canvasData; var source = getSourceCanvas(this.image, this.imageData, canvasData, options); // Returns the source canvas if it is not cropped. if (!this.cropped) { return source; } var _this$getData = this.getData(), initialX = _this$getData.x, initialY = _this$getData.y, initialWidth = _this$getData.width, initialHeight = _this$getData.height; var ratio = source.width / Math.floor(canvasData.naturalWidth); if (ratio !== 1) { initialX *= ratio; initialY *= ratio; initialWidth *= ratio; initialHeight *= ratio; } var aspectRatio = initialWidth / initialHeight; var maxSizes = getAdjustedSizes({ aspectRatio: aspectRatio, width: options.maxWidth || Infinity, height: options.maxHeight || Infinity }); var minSizes = getAdjustedSizes({ aspectRatio: aspectRatio, width: options.minWidth || 0, height: options.minHeight || 0 }, 'cover'); var _getAdjustedSizes = getAdjustedSizes({ aspectRatio: aspectRatio, width: options.width || (ratio !== 1 ? source.width : initialWidth), height: options.height || (ratio !== 1 ? source.height : initialHeight) }), width = _getAdjustedSizes.width, height = _getAdjustedSizes.height; width = Math.min(maxSizes.width, Math.max(minSizes.width, width)); height = Math.min(maxSizes.height, Math.max(minSizes.height, height)); var canvas = document.createElement('canvas'); var context = canvas.getContext('2d'); canvas.width = normalizeDecimalNumber(width); canvas.height = normalizeDecimalNumber(height); context.fillStyle = options.fillColor || 'transparent'; context.fillRect(0, 0, width, height); var _options$imageSmoothi = options.imageSmoothingEnabled, imageSmoothingEnabled = _options$imageSmoothi === void 0 ? true : _options$imageSmoothi, imageSmoothingQuality = options.imageSmoothingQuality; context.imageSmoothingEnabled = imageSmoothingEnabled; if (imageSmoothingQuality) { context.imageSmoothingQuality = imageSmoothingQuality; } // https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D.drawImage var sourceWidth = source.width; var sourceHeight = source.height; // Source canvas parameters var srcX = initialX; var srcY = initialY; var srcWidth; var srcHeight; // Destination canvas parameters var dstX; var dstY; var dstWidth; var dstHeight; if (srcX <= -initialWidth || srcX > sourceWidth) { srcX = 0; srcWidth = 0; dstX = 0; dstWidth = 0; } else if (srcX <= 0) { dstX = -srcX; srcX = 0; srcWidth = Math.min(sourceWidth, initialWidth + srcX); dstWidth = srcWidth; } else if (srcX <= sourceWidth) { dstX = 0; srcWidth = Math.min(initialWidth, sourceWidth - srcX); dstWidth = srcWidth; } if (srcWidth <= 0 || srcY <= -initialHeight || srcY > sourceHeight) { srcY = 0; srcHeight = 0; dstY = 0; dstHeight = 0; } else if (srcY <= 0) { dstY = -srcY; srcY = 0; srcHeight = Math.min(sourceHeight, initialHeight + srcY); dstHeight = srcHeight; } else if (srcY <= sourceHeight) { dstY = 0; srcHeight = Math.min(initialHeight, sourceHeight - srcY); dstHeight = srcHeight; } var params = [srcX, srcY, srcWidth, srcHeight]; // Avoid "IndexSizeError" if (dstWidth > 0 && dstHeight > 0) { var scale = width / initialWidth; params.push(dstX * scale, dstY * scale, dstWidth * scale, dstHeight * scale); } // All the numerical parameters should be integer for `drawImage` // https://github.com/fengyuanchen/cropper/issues/476 context.drawImage.apply(context, [source].concat(_toConsumableArray(params.map(function (param) { return Math.floor(normalizeDecimalNumber(param)); })))); return canvas; }, /** * Change the aspect ratio of the crop box. * @param {number} aspectRatio - The new aspect ratio. * @returns {Cropper} this */ setAspectRatio: function setAspectRatio(aspectRatio) { var options = this.options; if (!this.disabled && !isUndefined(aspectRatio)) { // 0 -> NaN options.aspectRatio = Math.max(0, aspectRatio) || NaN; if (this.ready) { this.initCropBox(); if (this.cropped) { this.renderCropBox(); } } } return this; }, /** * Change the drag mode. * @param {string} mode - The new drag mode. * @returns {Cropper} this */ setDragMode: function setDragMode(mode) { var options = this.options, dragBox = this.dragBox, face = this.face; if (this.ready && !this.disabled) { var croppable = mode === DRAG_MODE_CROP; var movable = options.movable && mode === DRAG_MODE_MOVE; mode = croppable || movable ? mode : DRAG_MODE_NONE; options.dragMode = mode; setData(dragBox, DATA_ACTION, mode); toggleClass(dragBox, CLASS_CROP, croppable); toggleClass(dragBox, CLASS_MOVE, movable); if (!options.cropBoxMovable) { // Sync drag mode to crop box when it is not movable setData(face, DATA_ACTION, mode); toggleClass(face, CLASS_CROP, croppable); toggleClass(face, CLASS_MOVE, movable); } } return this; } }; var AnotherCropper = WINDOW.Cropper; var Cropper = /*#__PURE__*/ function () { /** * Create a new Cropper. * @param {Element} element - The target element for cropping. * @param {Object} [options={}] - The configuration options. */ function Cropper(element) { var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {}; _classCallCheck(this, Cropper); if (!element || !REGEXP_TAG_NAME.test(element.tagName)) { throw new Error('The first argument is required and must be an <img> or <canvas> element.'); } this.element = element; this.options = assign({}, DEFAULTS, isPlainObject(options) && options); this.cropped = false; this.disabled = false; this.pointers = {}; this.ready = false; this.reloading = false; this.replaced = false; this.sized = false; this.sizing = false; this.init(); } _createClass(Cropper, [{ key: "init", value: function init() { var element = this.element; var tagName = element.tagName.toLowerCase(); var url; if (element[NAMESPACE]) { return; } element[NAMESPACE] = this; if (tagName === 'img') { this.isImg = true; // e.g.: "img/picture.jpg" url = element.getAttribute('src') || ''; this.originalUrl = url; // Stop when it's a blank image if (!url) { return; } // e.g.: "http://example.com/img/picture.jpg" url = element.src; } else if (tagName === 'canvas' && window.HTMLCanvasElement) { url = element.toDataURL(); } this.load(url); } }, { key: "load", value: function load(url) { var _this = this; if (!url) { return; } this.url = url; this.imageData = {}; var element = this.element, options = this.options; if (!options.rotatable && !options.scalable) { options.checkOrientation = false; } // Only IE10+ supports Typed Arrays if (!options.checkOrientation || !window.ArrayBuffer) { this.clone(); return; } // XMLHttpRequest disallows to open a Data URL in some browsers like IE11 and Safari if (REGEXP_DATA_URL.test(url)) { if (REGEXP_DATA_URL_JPEG.test(url)) { this.read(dataURLToArrayBuffer(url)); } else { this.clone(); } return; } var xhr = new XMLHttpRequest(); var clone = this.clone.bind(this); this.reloading = true; this.xhr = xhr; xhr.ontimeout = clone; xhr.onabort = clone; xhr.onerror = clone; xhr.onprogress = function () { if (xhr.getResponseHeader('content-type') !== MIME_TYPE_JPEG) { xhr.abort(); } }; xhr.onload = function () { _this.read(xhr.response); }; xhr.onloadend = function () { _this.reloading = false; _this.xhr = null; }; // Bust cache when there is a "crossOrigin" property to avoid browser cache error if (options.checkCrossOrigin && isCrossOriginURL(url) && element.crossOrigin) { url = addTimestamp(url); } xhr.open('GET', url); xhr.responseType = 'arraybuffer'; xhr.withCredentials = element.crossOrigin === 'use-credentials'; xhr.send(); } }, { key: "read", value: function read(arrayBuffer) { var options = this.options, imageData = this.imageData; var orientation = resetAndGetOrientation(arrayBuffer); var rotate = 0; var scaleX = 1; var scaleY = 1; if (orientation > 1) { // Generate a new Data URL with the orientation value set to 1 // as some iOS browsers will render image with its orientation this.url = arrayBufferToDataURL(arrayBuffer, MIME_TYPE_JPEG); var _parseOrientation = parseOrientation(orientation); rotate = _parseOrientation.rotate; scaleX = _parseOrientation.scaleX; scaleY = _parseOrientation.scaleY; } if (options.rotatable) { imageData.rotate = rotate; } if (options.scalable) { imageData.scaleX = scaleX; imageData.scaleY = scaleY; } this.clone(); } }, { key: "clone", value: function clone() { var element = this.element, url = this.url; var crossOrigin; var crossOriginUrl; if (this.options.checkCrossOrigin && isCrossOriginURL(url)) { crossOrigin = element.crossOrigin; if (crossOrigin) { crossOriginUrl = url; } else { crossOrigin = 'anonymous'; // Bust cache when there is not a "crossOrigin" property crossOriginUrl = addTimestamp(url); } } this.crossOrigin = crossOrigin; this.crossOriginUrl = crossOriginUrl; var image = document.createElement('img'); if (crossOrigin) { image.crossOrigin = crossOrigin; } image.src = crossOriginUrl || url; this.image = image; image.onload = this.start.bind(this); image.onerror = this.stop.bind(this); addClass(image, CLASS_HIDE); element.parentNode.insertBefore(image, element.nextSibling); } }, { key: "start", value: function start() { var _this2 = this; var image = this.isImg ? this.element : this.image; image.onload = null; image.onerror = null; this.sizing = true; var IS_SAFARI = WINDOW.navigator && /(Macintosh|iPhone|iPod|iPad).*AppleWebKit/i.test(WINDOW.navigator.userAgent); var done = function done(naturalWidth, naturalHeight) { assign(_this2.imageData, { naturalWidth: naturalWidth, naturalHeight: naturalHeight, aspectRatio: naturalWidth / naturalHeight }); _this2.sizing = false; _this2.sized = true; _this2.build(); }; // Modern browsers (except Safari) if (image.naturalWidth && !IS_SAFARI) { done(image.naturalWidth, image.naturalHeight); return; } var sizingImage = document.createElement('img'); var body = document.body || document.documentElement; this.sizingImage = sizingImage; sizingImage.onload = function () { done(sizingImage.width, sizingImage.height); if (!IS_SAFARI) { body.removeChild(sizingImage); } }; sizingImage.src = image.src; // iOS Safari will convert the image automatically // with its orientation once append it into DOM (#279) if (!IS_SAFARI) { sizingImage.style.cssText = 'left:0;' + 'max-height:none!important;' + 'max-width:none!important;' + 'min-height:0!important;' + 'min-width:0!important;' + 'opacity:0;' + 'position:absolute;' + 'top:0;' + 'z-index:-1;'; body.appendChild(sizingImage); } } }, { key: "stop", value: function stop() { var image = this.image; image.onload = null; image.onerror = null; image.parentNode.removeChild(image); this.image = null; } }, { key: "build", value: function build() { if (!this.sized || this.ready) { return; } var element = this.element, options = this.options, image = this.image; // Create cropper elements var container = element.parentNode; var template = document.createElement('div'); template.innerHTML = TEMPLATE; var cropper = template.querySelector(".".concat(NAMESPACE, "-container")); var canvas = cropper.querySelector(".".concat(NAMESPACE, "-canvas")); var dragBox = cropper.querySelector(".".concat(NAMESPACE, "-drag-box")); var cropBox = cropper.querySelector(".".concat(NAMESPACE, "-crop-box")); var face = cropBox.querySelector(".".concat(NAMESPACE, "-face")); this.container = container; this.cropper = cropper; this.canvas = canvas; this.dragBox = dragBox; this.cropBox = cropBox; this.viewBox = cropper.querySelector(".".concat(NAMESPACE, "-view-box")); this.face = face; canvas.appendChild(image); // Hide the original image addClass(element, CLASS_HIDDEN); // Inserts the cropper after to the current image container.insertBefore(cropper, element.nextSibling); // Show the image if is hidden if (!this.isImg) { removeClass(image, CLASS_HIDE); } this.initPreview(); this.bind(); options.initialAspectRatio = Math.max(0, options.initialAspectRatio) || NaN; options.aspectRatio = Math.max(0, options.aspectRatio) || NaN; options.viewMode = Math.max(0, Math.min(3, Math.round(options.viewMode))) || 0; addClass(cropBox, CLASS_HIDDEN); if (!options.guides) { addClass(cropBox.getElementsByClassName("".concat(NAMESPACE, "-dashed")), CLASS_HIDDEN); } if (!options.center) { addClass(cropBox.getElementsByClassName("".concat(NAMESPACE, "-center")), CLASS_HIDDEN); } if (options.background) { addClass(cropper, "".concat(NAMESPACE, "-bg")); } if (!options.highlight) { addClass(face, CLASS_INVISIBLE); } if (options.cropBoxMovable) { addClass(face, CLASS_MOVE); setData(face, DATA_ACTION, ACTION_ALL); } if (!options.cropBoxResizable) { addClass(cropBox.getElementsByClassName("".concat(NAMESPACE, "-line")), CLASS_HIDDEN); addClass(cropBox.getElementsByClassName("".concat(NAMESPACE, "-point")), CLASS_HIDDEN); } this.render(); this.ready = true; this.setDragMode(options.dragMode); if (options.autoCrop) { this.crop(); } this.setData(options.data); if (isFunction(options.ready)) { addListener(element, EVENT_READY, options.ready, { once: true }); } dispatchEvent(element, EVENT_READY); } }, { key: "unbuild", value: function unbuild() { if (!this.ready) { return; } this.ready = false; this.unbind(); this.resetPreview(); this.cropper.parentNode.removeChild(this.cropper); removeClass(this.element, CLASS_HIDDEN); } }, { key: "uncreate", value: function uncreate() { if (this.ready) { this.unbuild(); this.ready = false; this.cropped = false; } else if (this.sizing) { this.sizingImage.onload = null; this.sizing = false; this.sized = false; } else if (this.reloading) { this.xhr.onabort = null; this.xhr.abort(); } else if (this.image) { this.stop(); } } /** * Get the no conflict cropper class. * @returns {Cropper} The cropper class. */ }], [{ key: "noConflict", value: function noConflict() { window.Cropper = AnotherCropper; return Cropper; } /** * Change the default options. * @param {Object} options - The new default options. */ }, { key: "setDefaults", value: function setDefaults(options) { assign(DEFAULTS, isPlainObject(options) && options); } }]); return Cropper; }(); assign(Cropper.prototype, render, preview, events, handlers, change, methods); return Cropper;})));cropper-js
cropper-jquery-js
/*! * jQuery Cropper v1.0.0 * https://github.com/fengyuanchen/jquery-cropper * * Copyright (c) 2018 Chen Fengyuan * Released under the MIT license * * Date: 2018-04-01T06:20:13.168Z */(function (global, factory) { typeof exports === 'object' && typeof module !== 'undefined' ? factory(require('jquery'), require('cropperjs')) : typeof define === 'function' && define.amd ? define(['jquery', 'cropperjs'], factory) : global.layui && layui.define ? layui.define(['jquery', 'cropper'], function (exports) { exports('jqcropper', factory(layui.jquery, layui.cropper)) }) : (factory(global.jQuery, global.Cropper));}(this, (function ($, Cropper) { 'use strict'; $ = $ && $.hasOwnProperty('default') ? $['default'] : $; Cropper = Cropper && Cropper.hasOwnProperty('default') ? Cropper['default'] : Cropper; if ($.fn) { var AnotherCropper = $.fn.cropper; var NAMESPACE = 'cropper'; $.fn.cropper = function jQueryCropper(option) { for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) { args[_key - 1] = arguments[_key]; } var result = void 0; this.each(function (i, element) { var $element = $(element); var isDestroy = option === 'destroy'; var cropper = $element.data(NAMESPACE); if (!cropper) { if (isDestroy) { return; } var options = $.extend({}, $element.data(), $.isPlainObject(option) && option); cropper = new Cropper(element, options); $element.data(NAMESPACE, cropper); } if (typeof option === 'string') { var fn = cropper[option]; if ($.isFunction(fn)) { result = fn.apply(cropper, args); if (result === cropper) { result = undefined; } if (isDestroy) { $element.removeData(NAMESPACE); } } } }); return result !== undefined ? result : this; }; $.fn.cropper.Constructor = Cropper; $.fn.cropper.setDefaults = Cropper.setDefaults; $.fn.cropper.noConflict = function noConflict() { $.fn.cropper = AnotherCropper; return this; }; }})));cropper-jquery
实现图片裁剪的代码
裁剪HTML
<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title></title> <meta name="renderer" content="webkit"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"> <link rel="stylesheet" href="{{static_url('layui/css/layui.css')}}" media="all"> <link rel="stylesheet" href="{{static_url('cropper/cropper.css')}}"> <style> #choice-btn { display: inline-block; height: 38px; line-height: 38px; padding: 0 18px; background-color: #009688; color: #fff; white-space: nowrap; text-align: center; font-size: 14px; border: none; border-radius: 2px; cursor: pointer; } </style></head><body><div style="margin: 20px;"> <div style="margin-bottom:30px;"> <label for="cropper_imgUpload"> <span id="choice-btn"><i></i>选择图片</span> </label> <input type="file" id="cropper_imgUpload" name="file" style="display:none" accept="image/*"> </div> <div class="layui-row layui-col-space15"> <div> <div id="readyimg" style="height: 360px;width: 100%;border: 1px dashed black;background-color: rgb(247, 247, 247);"> <img id="img" src="" alt=""> </div> </div> <div> <div>预览:</div> <div id="img-preview" style="width: 180px;height: 120px;overflow: hidden;border: 1px dashed black;"> </div> </div> </div> <div class="layui-row layui-hide oper-btn" style="margin-top: 20px;"> <div> <button type="button" class="layui-btn layui-icon layui-icon-left" cropper-event="rotate" data-option="-15" title="Rotate -90 degrees"> 向左旋转 </button> <button type="button" class="layui-btn layui-icon layui-icon-right" cropper-event="rotate" data-option="15" title="Rotate 90 degrees"> 向右旋转 </button> <button type="button" class="layui-btn layui-icon layui-icon-refresh" cropper-event="reset" title="reset-image">重置图片 </button> </div> <div class="layui-col-xs2 layui-col-xs-offset1"> <button type="button" class="layui-btn layui-btn-fluid" id="keep-save" cropper-event="confirmSave">保存修改 </button> </div> </div></div><script src="{{static_url('layui/layui.js')}}" charset="utf-8"></script><script> layui.config({ base: '/static/cropper/' }).extend({ cropper: 'cropper' }).use(['element', 'layer', 'cropper', 'jquery', 'jqcropper'], function () { var element = layui.element; var $ = layui.jquery; var layer = layui.layer; var cropper = layui.cropper; var imageEle = $("#img") , preview = '#img-preview' , file = $("input[name='file']") , uploadImageMaxSize = 2048 //文件上传大小限制 , options = { aspectRatio: 3 / 2, viewMode: 1, preview: preview, dragMode: 'none', responsive: false, restore: false // cropBoxMovable:false, // cropBoxResizable:false, }; // 找到上传图片的input标签绑定change事件 $("#cropper_imgUpload").change(function () { $(".oper-btn").removeClass("layui-hide"); // 1. 创建一个读取文件的对象 var fileReader = new FileReader(); fileReader.readAsDataURL(this.files[0]); fileReader.onload = function () { // 2. 等上一步读完文件之后才 把图片加载到img标签中 imageEle.attr("src", fileReader.result); //图片链接（base64） imageEle.cropper(options); }; }); $(".layui-btn").on('click', function () { var event = $(this).attr("cropper-event"); //监听确认保存图像 if (event === 'confirmSave') { imageEle.cropper("getCroppedCanvas").toBlob(function (blob) { var filesize = (blob["size"] / 1024).toFixed(2); if (filesize < uploadImageMaxSize) { var formData = new FormData(); formData.append('file', blob); $.ajax({ method: "post", url: '/web/api/upload/upload?option={{option}}', //用于文件上传的服务器端请求地址 data: formData, processData: false, contentType: false, success: function (response) { if (response.code === 0) { // 代开裁剪页面的回调函数 parent.cropperCallback(response.data, '{{index}}'); layer.msg("上传成功", { icon: 1, time: 2500 // 默认三秒 }, function () { // 回调关闭弹出层 var index = parent.layer.getFrameIndex(window.name); parent.layer.close(index); }); $(".canvanslog").attr("src", response.data[0].fp_show); } else { layer.alert(response.msg, {icon: 2}); } }, error: function (response) { layer.alert("网络异常", {icon: 2}); } }); } else { layer.alert("上传图片大小不超过" + uploadImageMaxSize + "KB", {icon: 2}) } }); } else if (event === 'rotate') { //监听旋转 var option = $(this).attr('data-option'); imageEle.cropper('rotate', option); } else if (event === 'reset') { //重设图片 imageEle.cropper('reset'); } }); });</script></body></html>cropper-html
父页面的回调
// 图片上传成功回调函数 function cropperCallback(response, index) { if (response) { var inputEle = document.getElementById("imgInput"); if (index === "None") { // 添加图片的回调 var trEle = document.createElement("tr"); var addImageIndex = totalArray.length; trEle.innerHTML = '<td><img src="' + response[0].fp_show + '" alt=""></td><td><span style="color: #5FB878;">添加成功</span></td><td>' + '<button type="button" class="layui-btn layui-btn-sm edit-btn" id="edit_' + addImageIndex + '">修改</button>' + '<button type="button" class="layui-btn layui-btn-sm delete-btn" id="delete_' + addImageIndex + '">删除</button></td>'; document.getElementById("imgList").appendChild(trEle); totalArray.push(response[0].fp_relative); } else { // 修改图片的回调 var thisTrChild = document.getElementById("edit_" + index).parentElement.parentElement.children; thisTrChild[0].innerHTML = '<img src="' + response[0].fp_show + '" alt="">'; thisTrChild[1].innerHTML = '<span style="color: #5FB878;">修改成功</span>'; totalArray[parseInt(index)] = response[0].fp_relative; } inputEle.value = totalArray.join(","); } }
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出处：https://www.cnblogs.com/zhaopanpan/
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