283 lines
8.6 KiB
JavaScript
283 lines
8.6 KiB
JavaScript
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/*!
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* imagesLoaded v3.0.2
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* JavaScript is all like "You images are done yet or what?"
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*/
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(function (window) {
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'use strict';
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var $ = window.jQuery;
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var console = window.console;
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var hasConsole = typeof console !== 'undefined';
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// -------------------------- helpers -------------------------- //
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// extend objects
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function extend(a, b) {
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for (var prop in b) {
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a[prop] = b[prop];
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}
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return a;
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}
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var objToString = Object.prototype.toString;
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function isArray(obj) {
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return objToString.call(obj) === '[object Array]';
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}
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// turn element or nodeList into an array
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function makeArray(obj) {
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var ary = [];
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if (isArray(obj)) {
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// use object if already an array
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ary = obj;
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} else if (typeof obj.length === 'number') {
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// convert nodeList to array
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for (var i = 0, len = obj.length; i < len; i++) {
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ary.push(obj[i]);
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}
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} else {
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// array of single index
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ary.push(obj);
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}
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return ary;
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}
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// -------------------------- -------------------------- //
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function defineImagesLoaded(EventEmitter, eventie) {
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/**
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* @param {Array, Element, NodeList, String} elem
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* @param {Object or Function} options - if function, use as callback
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* @param {Function} onAlways - callback function
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*/
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function ImagesLoaded(elem, options, onAlways) {
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// coerce ImagesLoaded() without new, to be new ImagesLoaded()
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if (!(this instanceof ImagesLoaded)) {
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return new ImagesLoaded(elem, options);
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}
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// use elem as selector string
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if (typeof elem === 'string') {
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elem = document.querySelectorAll(elem);
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}
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this.elements = makeArray(elem);
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this.options = extend({}, this.options);
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if (typeof options === 'function') {
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onAlways = options;
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} else {
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extend(this.options, options);
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}
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if (onAlways) {
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this.on('always', onAlways);
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}
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this.getImages();
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if ($) {
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// add jQuery Deferred object
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this.jqDeferred = new $.Deferred();
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}
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// HACK check async to allow time to bind listeners
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var _this = this;
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setTimeout(function () {
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_this.check();
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});
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}
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ImagesLoaded.prototype = new EventEmitter();
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ImagesLoaded.prototype.options = {};
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ImagesLoaded.prototype.getImages = function () {
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this.images = [];
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// filter & find items if we have an item selector
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for (var i = 0, len = this.elements.length; i < len; i++) {
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var elem = this.elements[i];
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// filter siblings
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if (elem.nodeName === 'IMG') {
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this.addImage(elem);
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}
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// find children
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var childElems = elem.querySelectorAll('img');
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// concat childElems to filterFound array
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for (var j = 0, jLen = childElems.length; j < jLen; j++) {
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var img = childElems[j];
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this.addImage(img);
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}
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}
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};
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/**
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* @param {Image} img
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*/
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ImagesLoaded.prototype.addImage = function (img) {
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var loadingImage = new LoadingImage(img);
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this.images.push(loadingImage);
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};
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ImagesLoaded.prototype.check = function () {
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var _this = this;
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var checkedCount = 0;
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var length = this.images.length;
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this.hasAnyBroken = false;
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// complete if no images
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if (!length) {
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this.complete();
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return;
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}
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function onConfirm(image, message) {
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if (_this.options.debug && hasConsole) {
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console.log('confirm', image, message);
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}
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_this.progress(image);
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checkedCount++;
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if (checkedCount === length) {
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_this.complete();
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}
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return true; // bind once
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}
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for (var i = 0; i < length; i++) {
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var loadingImage = this.images[i];
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loadingImage.on('confirm', onConfirm);
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loadingImage.check();
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}
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};
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ImagesLoaded.prototype.progress = function (image) {
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this.hasAnyBroken = this.hasAnyBroken || !image.isLoaded;
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this.emit('progress', this, image);
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if (this.jqDeferred) {
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this.jqDeferred.notify(this, image);
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}
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};
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ImagesLoaded.prototype.complete = function () {
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var eventName = this.hasAnyBroken ? 'fail' : 'done';
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this.isComplete = true;
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this.emit(eventName, this);
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this.emit('always', this);
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if (this.jqDeferred) {
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var jqMethod = this.hasAnyBroken ? 'reject' : 'resolve';
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this.jqDeferred[jqMethod](this);
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}
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};
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// -------------------------- jquery -------------------------- //
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if ($) {
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$.fn.imagesLoaded = function (options, callback) {
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var instance = new ImagesLoaded(this, options, callback);
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return instance.jqDeferred.promise($(this));
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};
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}
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// -------------------------- -------------------------- //
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var cache = {};
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function LoadingImage(img) {
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this.img = img;
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}
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LoadingImage.prototype = new EventEmitter();
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LoadingImage.prototype.check = function () {
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// first check cached any previous images that have same src
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var cached = cache[this.img.src];
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if (cached) {
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this.useCached(cached);
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return;
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}
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// add this to cache
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cache[this.img.src] = this;
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// If complete is true and browser supports natural sizes,
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// try to check for image status manually.
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if (this.img.complete && this.img.naturalWidth !== undefined) {
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// report based on naturalWidth
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this.confirm(this.img.naturalWidth !== 0, 'naturalWidth');
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return;
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}
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// If none of the checks above matched, simulate loading on detached element.
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var proxyImage = this.proxyImage = new Image();
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eventie.bind(proxyImage, 'load', this);
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eventie.bind(proxyImage, 'error', this);
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proxyImage.src = this.img.src;
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};
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LoadingImage.prototype.useCached = function (cached) {
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if (cached.isConfirmed) {
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this.confirm(cached.isLoaded, 'cached was confirmed');
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} else {
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var _this = this;
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cached.on('confirm', function (image) {
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_this.confirm(image.isLoaded, 'cache emitted confirmed');
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return true; // bind once
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});
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}
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};
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LoadingImage.prototype.confirm = function (isLoaded, message) {
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this.isConfirmed = true;
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this.isLoaded = isLoaded;
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this.emit('confirm', this, message);
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};
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// trigger specified handler for event type
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LoadingImage.prototype.handleEvent = function (event) {
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var method = 'on' + event.type;
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if (this[method]) {
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this[method](event);
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}
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};
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LoadingImage.prototype.onload = function () {
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this.confirm(true, 'onload');
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this.unbindProxyEvents();
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};
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LoadingImage.prototype.onerror = function () {
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this.confirm(false, 'onerror');
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this.unbindProxyEvents();
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};
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LoadingImage.prototype.unbindProxyEvents = function () {
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eventie.unbind(this.proxyImage, 'load', this);
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eventie.unbind(this.proxyImage, 'error', this);
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};
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// ----- ----- //
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return ImagesLoaded;
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}
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// -------------------------- transport -------------------------- //
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if (typeof define === 'function' && define.amd) {
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// AMD
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define([
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'eventEmitter',
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'eventie'
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],
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defineImagesLoaded);
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} else {
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// browser global
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window.imagesLoaded = defineImagesLoaded(
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window.EventEmitter,
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window.eventie
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);
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}
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})(window);
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