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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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