andrzejpolis / waitforimages

A jQuery plugin that lets you attach callbacks to useful image loading events.

#waitForImages 1.4.2#

Copyright (c) 2011-2013 Alex Dickson @alexdickson

Licensed under the MIT licenses.

http://alexanderdickson.com

##Overview##

Provides useful callbacks once descendant images have loaded.

waitForImages also supports images referenced in CSS, such as the background-image property.

It can be useful when WebKit incorrectly reports element dimensions/offsets on document ready, because it has not calculated their descendant img dimensions yet.

##Download##

• Production (minified)
• Development (unminified)

##Usage##

###Standard###

Just provide a callback function and it will be called once all descendent images have loaded.

$('selector').waitForImages(function() {
	// All descendant images have loaded, now slide up.
    $(this).slideUp();	
});

this is a reference to the collection that waitForImages() was called on.

###Advanced###

You can pass a second function as a callback that will be called for each image that is loaded, with some information passed as arguments.

$('selector').waitForImages(function() {
    alert('All images have loaded.');
}, function(loaded, count, success) {
   alert(loaded + ' of ' + count + ' images has ' + (success ? 'loaded' : 'failed to load') +  '.');
   $(this).addClass('loaded');
});

You can also set the third argument to true if you'd like the plugin to iterate over the colleciton and all descendent elements, checking for images referenced in the CSS (by default, it looks at the background-image, list-style-image, border-image and border-corner-image properties). If it finds any, they will be treated as a descendant image.

The callback will be called on the successful and unsuccessful loading of the image. Check the third argument to determine the success of the image load. It will be true if the image loaded successfully.

If you want to skip the first argument, pass $.noop or alternatively, pass an object literal to the plugin, instead of the arguments individually.

$('selector').waitForImages({
    finished: function() {
        // ...
    },
    each: function() {
       // ...
    },
    waitForAll: true
});

You may also set the CSS properties that possibly contain image references yourself. Just assign an array of properties to the plugin.

$.waitForImages.hasImgProperties = ['backgroundImage'];

waitForImages also exposes a custom selector, :uncached, which when used in conjunction with the img selector, allows you to select img elements that are not cached already by the browser.

$('img:uncached').attr('title', 'Loading Image');

##Thanks##

• Matt Scharley
• Astletron
• Zerkms

##Feedback##

Please use the Issues for any bugs, feature requests, etc.