Progressive Image Loader
A Progressive Image loader javascript class. Originally created by Hinderling Volkart AG. With a few tweaks made for my specific needs of a more obsessive asset nullification system.
Usage:
//path, numImages, opts
var imgLoader = new ProgressiveImageSequence("path/to/directory/frame-{index}.jpg", 3221, {
indexSize : 6,// makes your filename to load path/to/directory/frame-000001 always 6 digits
initialStep : 64, // starts at every 64th img then every 32nd img, then every 16th img etc. ALWAYS a power of 2
onProgress : onImgLoaderProgress, //function to fire when an image loads
onComplete : onImgLoaderComplete, // function to fire when loading completes
stopAt : 1,//when to stop loading, 1 will be the last image
loadDelay : CSSTransformSupport ? 5 : 50 //milliseconds to wait before loading next image in the load loop
});
//when ready to start loading
var loadStartPosition = loadCounterForIE = 0;
imgLoader.loadPosition(loadStartPosition, function(){
//because sometimes IE will fire this multiple times I added this to make sure it fires once
loadCounterForIE++;
if(loadCounterForIE == 1)
imgLoader.load();//start the loading progress
}):
Useful Methods
You can obviously call any method that is under the this name space (this.whatever()) but i find these few have been useful for me
imgLoader.getNumLoaded(); //returns the number of images loaded
imgLoader.getLoadProgress(): // returns load progress (0-100%)
imgLoader.loadPosition(position); //loads an image at a certain position through the sequence
imgLoader.getAt(index);// returns an image at a specific index
imgLoader.reset();//resets loading back to initial state
imgLoader.stop();// stop loading and leave the loaded stuff as is
imgLoader.stopLoading();// added by me, stops loading, removes event listener references and unloads all images, setting those to null.