#Image load queue

Create images preload queue, pause it and restart it.

var images = [
    'https://farm9.staticflickr.com/8517/8400604049_5ddaa2d1ab_h.jpg',
    'https://farm9.staticflickr.com/8369/8397734127_de5c5370e1_h.jpg',
];

queue = imagePreloaderQueue();

queue.add(images);

queue.onQueueLoad(function () {
    var srcList = queue.getLoaded();
    // do something with loaded images
});

Methods

add

Add images to queue.

queue.add(['http://example.com/image1.jpg', 'http://example.com/image2.jpg']);
queue.add('http://example.com/image3.jpg', 'http://example.com/image4.jpg');
queue.add(['http://example.com/image5.jpg', 'http://example.com/image6.jpg'], 'http://example.com/image7.jpg');

start

Start/resume loading images.

pause

Pause loading.

pauseFor

Pause loading for X milliseconds.

queue.pauseFor(1000); // Pause for 1 second

onAfterItem

Callback function that is fired and image is process - either success or error.

queue.onAfterItem(function (src) {
    console.log(src);
}); 

onItemError

Callback function that is fired if image failed to load.

queue.onItemError(function (src) {
    console.log('Error: ' + src);
}); 

onBeforeItemLoad

Callback function that is fired before image start to load.

queue.onBeforeItemLoad(function (src) {
    console.log('Loading: ' + src);
}); 

onAfterItemLoad

Callback function that is fired after image is successfuly loaded.

queue.onBeforeItemLoad(function (src) {
    jQuery('BODY').append('<img src="' + src + '" alt="">');
}); 

onQueueLoad

Callback function that is fired after all queue is process - including unsuccessful images.

queue.onQueueLoad(function () {
    console.log(queue.getLoaded());
}); 

getProgress

Progress = number of processed images / total number of images. This show progress in number of loaded images, not bytes loaded.

jQuery('#progress').text(Math.round(queue.getProgress() * 100) + '%');

queue.getProgress(function () {
    console.log(queue.getLoaded());
});

getLoaded

Returns array of loaded files at given moment.

getQueue

Returns array of queued files at given moment.

isStarted

Returns true if queue was started, false if it wasn't started or was paused.

TODO

Add more tests.