Created
July 2, 2009 01:35
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// An image preloader without using Image class nor document.images | |
// Built for a Facebook environment where those two are forbiden. May not work in a regular web page. | |
// Just change | |
function Preloader(options) { | |
var defaultSettings = { | |
preloaderID: "preloader_id", | |
container: document.body | |
}; | |
this.settings = this.extend(defaultSettings, options || {}); | |
this.buildPreloader(); | |
}; | |
Preloader.prototype = { | |
extend: function(destination, source) { | |
for (var property in source) | |
destination[property] = source[property]; | |
return destination; | |
}, | |
// Prepare the preloader. Just a IMG html element hidden with css. | |
buildPreloader: function(preloaderId) { | |
var image = document.createElement('IMG') | |
.setId(this.settings.preloaderId) | |
.setStyle({display: 'none'}); | |
this.settings.container.appendChild(image); | |
}, | |
// Update de src attribute of our hidden tag with the passing url. | |
// Having the src updated will make the tag to load the image. | |
preloadPic: function(imageUrl) { | |
var preloader = document.getElementById(this.settings.preloaderId); | |
if (preloader) { | |
preloader.setSrc(imageUrl); | |
// Don't know why, setting the src make the picture visible. | |
// Have to hide it again. | |
preloader.setStyle({display: 'none'}); | |
} | |
} | |
}; |
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