Walter.js 
Walter.js is a Javascript library that does all common things that you usually do when preload images. In this way Walter.js exports an easy Api based on Promises and events in wich you can subscribe for know the status of each image.
API
Preload one image
var promise = Walter('picture.jpg');Preload multiple images
var promise = Walter(['picture1.jpg', 'picture2.jpg']);Events
var promise = Walter(['picture1.jpg', 'picture2.jpg']);
//It's called when each image is loaded
promise.progress(function(index, img) {
console.log(index, img);
});
//It's called when all images are loaded
promise.then(function(images) {
console.log('then', images);
});
//It's called if some image has error
promise.catch(function(promise) {
console.log('catch', promise);
});Chaining
You can also use Walter.js with chain style
promise.then(onComplete).catch(onError).progress(onUpdate);Config
Walter.config({
path: 'assets/images'
});Dependencies
None :D
How to Run Unit Tests
- npm install
- grunt test
TODO
- Add RSVP library for support old browsers
- Document code