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imageLoader.js
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imageLoader.js
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/*
* imageLoader
* @author Marcin Rek
* @version 0.1
*/
/*
* 1. Promise polyfill
*/
if (!window.Promise) {
/* jshint ignore:start */
!function(e){function n(){}function t(e,n){return function(){e.apply(n,arguments)}}function o(e){if("object"!=typeof this)throw new TypeError("Promises must be constructed via new");if("function"!=typeof e)throw new TypeError("not a function");this._state=0,this._handled=!1,this._value=void 0,this._deferreds=[],s(e,this)}function i(e,n){for(;3===e._state;)e=e._value;return 0===e._state?void e._deferreds.push(n):(e._handled=!0,void o._immediateFn(function(){var t=1===e._state?n.onFulfilled:n.onRejected;if(null===t)return void(1===e._state?r:u)(n.promise,e._value);var o;try{o=t(e._value)}catch(i){return void u(n.promise,i)}r(n.promise,o)}))}function r(e,n){try{if(n===e)throw new TypeError("A promise cannot be resolved with itself.");if(n&&("object"==typeof n||"function"==typeof n)){var i=n.then;if(n instanceof o)return e._state=3,e._value=n,void f(e);if("function"==typeof i)return void s(t(i,n),e)}e._state=1,e._value=n,f(e)}catch(r){u(e,r)}}function u(e,n){e._state=2,e._value=n,f(e)}function f(e){2===e._state&&0===e._deferreds.length&&o._immediateFn(function(){e._handled||o._unhandledRejectionFn(e._value)});for(var n=0,t=e._deferreds.length;n<t;n++)i(e,e._deferreds[n]);e._deferreds=null}function c(e,n,t){this.onFulfilled="function"==typeof e?e:null,this.onRejected="function"==typeof n?n:null,this.promise=t}function s(e,n){var t=!1;try{e(function(e){t||(t=!0,r(n,e))},function(e){t||(t=!0,u(n,e))})}catch(o){if(t)return;t=!0,u(n,o)}}var a=setTimeout;o.prototype["catch"]=function(e){return this.then(null,e)},o.prototype.then=function(e,t){var o=new this.constructor(n);return i(this,new c(e,t,o)),o},o.all=function(e){var n=Array.prototype.slice.call(e);return new o(function(e,t){function o(r,u){try{if(u&&("object"==typeof u||"function"==typeof u)){var f=u.then;if("function"==typeof f)return void f.call(u,function(e){o(r,e)},t)}n[r]=u,0===--i&&e(n)}catch(c){t(c)}}if(0===n.length)return e([]);for(var i=n.length,r=0;r<n.length;r++)o(r,n[r])})},o.resolve=function(e){return e&&"object"==typeof e&&e.constructor===o?e:new o(function(n){n(e)})},o.reject=function(e){return new o(function(n,t){t(e)})},o.race=function(e){return new o(function(n,t){for(var o=0,i=e.length;o<i;o++)e[o].then(n,t)})},o._immediateFn="function"==typeof setImmediate&&function(e){setImmediate(e)}||function(e){a(e,0)},o._unhandledRejectionFn=function(e){"undefined"!=typeof console&&console&&console.warn("Possible Unhandled Promise Rejection:",e)},o._setImmediateFn=function(e){o._immediateFn=e},o._setUnhandledRejectionFn=function(e){o._unhandledRejectionFn=e},"undefined"!=typeof module&&module.exports?module.exports=o:e.Promise||(e.Promise=o)}(this);
/* jshint ignore:end */
}
/*
* 2. Create custom events
*/
var loaderUpdated = new Event('loader-updated');
/*
* 3. Image Loader OBJ
*/
var imageLoader = {
// Images to load
images: [],
// Preload promise array
preloadPromises: [],
// Preloader data
preloadData: {
imageCount: undefined,
imagesLoaded: 0,
percent: 0
},
// Act on image loaded
onImageLoaded: function(loaderId) {
var _this = this;
// Increment loaded images count
_this.preloadData.imagesLoaded = _this.preloadData.imagesLoaded + 1;
// Count percent
_this.preloadData.percent = Math.round((_this.preloadData.imagesLoaded / _this.preloadData.imageCount) * 100);
// Run custom trigger
if (document.getElementById(loaderId) && undefined !== loaderId) {
document.getElementById(loaderId).dispatchEvent(loaderUpdated);
}
},
// Get images from scene
getImagesFromScene: function(id) {
var _this = this;
// Clear arrays
_this.images = [];
_this.preloadPromises = [];
// Loop through images
var elements = document.querySelectorAll('#' + id + ' [data-src], #' + id + ' [data-src-bg]'),
i;
for (i = 0; i < elements.length; i+=1) {
var item = elements[i],
parent = item,
parentNode = item.parentNode;
id = item.id ? item.id : undefined,
data = item.dataset ? item.dataset : undefined,
src = item.dataset.src ? item.dataset.src : item.dataset.srcBg,
type = item.dataset.src ? 'img' : 'bg',
alt = item.dataset.alt ? item.dataset.alt : false,
classVal = item.dataset.class ? item.dataset.class : false;
// Create OBJ with image data
var tempImgObj = {
id: id,
data: data,
parent: parent,
parentNode: parentNode,
src: src,
type: type,
alt: alt,
classVal: classVal
};
// Push the object to array
_this.images.push(tempImgObj);
}
// Update data OBJ
_this.preloadData.imageCount = _this.images.length;
},
// Place the images in DOM
buildImages: function() {
var _this = this;
// Loop through image OBJs
_this.images.map(function(el, i){
// Regular image
if (el.type === 'img') {
//var $img = $('<img src="'+item.src+'"/>');
var img = document.createElement('img');
// Set img src
img.src = el.src;
// Apply id
if (el.id) {
img.id = el.id;
}
// Apply alt
if (el.alt) {
img.alt = el.alt;
}
// Apply classes
if (el.classVal) {
el.classVal.split(' ').map(function(item){
img.classList.add(item);
});
}
// Apply data
if (el.data) {
for (var property in el.data) {
if (el.data.hasOwnProperty(property) && (property !== 'src' && property !== 'alt' && property !== 'class')) {
img.dataset[property] = el.data[property];
}
}
}
// Insert image before item
el.parentNode.insertBefore(img, el.parent);
// Remove item
el.parentNode.removeChild(el.parent);
} else { // ... else background image
el.parent.style.backgroundImage = 'url("' + el.src+'")';
// Apply classes
if (el.classVal) {
el.classVal.split(' ').map(function (item) {
el.parent.classList.add(item);
});
}
// Remove data-src-bg
delete el.parent.dataset.srcBg;
// Remove data-src-bg
delete el.parent.dataset.class;
}
});
},
// Preload the images
preloadImages: function(parentResolve, loaderId) {
var _this = this;
// Loop trough images
_this.images.map(function(item, i){
var imgSrc = item.src;
// Create the promise
var imagePromise = new Promise(function(resolve,reject){
var img = new Image();
img.onload = function(){
_this.onImageLoaded(loaderId);
resolve();
};
img.onerror = function(){
_this.onImageLoaded(loaderId);
resolve();
};
img.src = imgSrc;
});
// Push the promise to array
_this.preloadPromises.push(imagePromise);
});
// When all images load put them in DOM
Promise.all(_this.preloadPromises)
.then(function() {
// Place the images in DOM
_this.buildImages();
// Resolved passed promises if available
if (parentResolve !== undefined) {
parentResolve();
}
});
},
// Run
loadSceneImages: function(id, loaderId) {
var _this = this;
// Clear arrays
_this.images = [];
_this.preloadPromises = [];
_this.preloadData = {
imageCount: undefined,
imagesLoaded: 0,
percent: 0
}
// Create the promise
var promise = new Promise(function(resolve, reject){
// Get images data
_this.getImagesFromScene(id);
// Preload the images
_this.preloadImages(resolve, loaderId);
});
return promise;
}
};