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LazyLoad.js
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Lazy Load</title> | |
| </head> | |
| <body> | |
| <!-- sample image --> | |
| <img src="http://wiki.softwarelivre.org/pub/System/DocumentGraphics/blank.gif" data-src="http://darksouls3.wiki.fextralife.com/file/view/Dark_Souls_3_E3_screenshot_10.jpg"> | |
| <img src="http://wiki.softwarelivre.org/pub/System/DocumentGraphics/blank.gif" data-src="http://images.alphacoders.com/278/278051.jpg"> | |
| <img src="http://wiki.softwarelivre.org/pub/System/DocumentGraphics/blank.gif" data-src="https://wallpaperscraft.com/image/might_and_magic_heroes_6_dragons_battle_wings_21181_3840x2160.jpg"> | |
| <hr /> | |
| <img id="image-0" width="500" src="http://wiki.softwarelivre.org/pub/System/DocumentGraphics/blank.gif" data-src="http://darksouls3.wiki.fextralife.com/file/view/Dark_Souls_3_E3_screenshot_10.jpg"> | |
| <img id="image-1" width="500" src="http://wiki.softwarelivre.org/pub/System/DocumentGraphics/blank.gif" data-src="http://images.alphacoders.com/278/278051.jpg"> | |
| <img id="image-2" width="500" src="http://wiki.softwarelivre.org/pub/System/DocumentGraphics/blank.gif" data-src="https://wallpaperscraft.com/image/might_and_magic_heroes_6_dragons_battle_wings_21181_3840x2160.jpg"> | |
| <script src="LazyLoad.js"></script> | |
| <script> | |
| window.onload = function() { | |
| //var lLoad = new LazyLoad(); | |
| var lLoad2 = new LazyLoad([ | |
| 'image-0', | |
| 'image-1', | |
| 'image-2' | |
| ]); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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| // I didn't test this yet, please feel free to comment | |
| var LazyLoad = function(imagesIds) { | |
| this.imagesSrc = []; | |
| this.init(imagesIds); | |
| return this; | |
| }; | |
| LazyLoad.prototype = { | |
| init: function(imagesId) { | |
| if (imagesId && imagesId.length > 0) { | |
| this.getImages(imagesId); | |
| } else { | |
| this.getAllImages(); | |
| } | |
| this.load(); | |
| }, | |
| getImages: function(imagesId) { | |
| for (var index in imagesId) { | |
| var image = document.getElementById(imagesId[index]); | |
| if (typeof image.getAttribute !== 'function') { | |
| continue; | |
| } | |
| this.imagesSrc.push({ | |
| 'element': image, | |
| 'src': image.getAttribute('data-src') | |
| }); | |
| } | |
| }, | |
| getAllImages: function() { | |
| var images = document.getElementsByTagName('img'); | |
| for (var index in images) { | |
| if (typeof images[index].getAttribute !== 'function') { | |
| continue; | |
| } | |
| this.imagesSrc.push({ | |
| 'element': images[index], | |
| 'src': images[index].getAttribute('data-src') | |
| }); | |
| } | |
| }, | |
| load: function() { | |
| var _this = this; | |
| var image = this.imagesSrc.shift(); | |
| if (!image) { | |
| return; | |
| } | |
| var img = new Image(); | |
| img.onload = function() { | |
| image.element.src = image.src; | |
| _this.load(); | |
| } | |
| img.src = image.src; | |
| } | |
| }; |
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