145 lines
5 KiB
JavaScript
145 lines
5 KiB
JavaScript
/*
|
|
* waitForImages 1.4
|
|
* -----------------
|
|
* Provides a callback when all images have loaded in your given selector.
|
|
* http://www.alexanderdickson.com/
|
|
*
|
|
*
|
|
* Copyright (c) 2011 Alex Dickson
|
|
* Licensed under the MIT licenses.
|
|
* See website for more info.
|
|
*
|
|
*/
|
|
|
|
;(function($) {
|
|
// Namespace all events.
|
|
var eventNamespace = 'waitForImages';
|
|
|
|
// CSS properties which contain references to images.
|
|
$.waitForImages = {
|
|
hasImageProperties: [
|
|
'backgroundImage',
|
|
'listStyleImage',
|
|
'borderImage',
|
|
'borderCornerImage'
|
|
]
|
|
};
|
|
|
|
// Custom selector to find `img` elements that have a valid `src` attribute and have not already loaded.
|
|
$.expr[':'].uncached = function(obj) {
|
|
// Ensure we are dealing with an `img` element with a valid `src` attribute.
|
|
if ( ! $(obj).is('img[src!=""]')) {
|
|
return false;
|
|
}
|
|
|
|
// Firefox's `complete` property will always be`true` even if the image has not been downloaded.
|
|
// Doing it this way works in Firefox.
|
|
var img = document.createElement('img');
|
|
img.src = obj.src;
|
|
return ! img.complete;
|
|
};
|
|
|
|
$.fn.waitForImages = function(finishedCallback, eachCallback, waitForAll) {
|
|
|
|
// Handle options object.
|
|
if ($.isPlainObject(arguments[0])) {
|
|
eachCallback = finishedCallback.each;
|
|
waitForAll = finishedCallback.waitForAll;
|
|
finishedCallback = finishedCallback.finished;
|
|
}
|
|
|
|
// Handle missing callbacks.
|
|
finishedCallback = finishedCallback || $.noop;
|
|
eachCallback = eachCallback || $.noop;
|
|
|
|
// Convert waitForAll to Boolean
|
|
waitForAll = !! waitForAll;
|
|
|
|
// Ensure callbacks are functions.
|
|
if (!$.isFunction(finishedCallback) || !$.isFunction(eachCallback)) {
|
|
throw new TypeError('An invalid callback was supplied.');
|
|
};
|
|
|
|
return this.each(function() {
|
|
// Build a list of all imgs, dependent on what images will be considered.
|
|
var obj = $(this),
|
|
allImgs = [];
|
|
|
|
if (waitForAll) {
|
|
// CSS properties which may contain an image.
|
|
var hasImgProperties = $.waitForImages.hasImageProperties || [],
|
|
matchUrl = /url\((['"]?)(.*?)\1\)/g;
|
|
|
|
// Get all elements, as any one of them could have a background image.
|
|
obj.find('*').each(function() {
|
|
var element = $(this);
|
|
|
|
// If an `img` element, add it. But keep iterating in case it has a background image too.
|
|
if (element.is('img:uncached')) {
|
|
allImgs.push({
|
|
src: element.attr('src'),
|
|
element: element[0]
|
|
});
|
|
}
|
|
|
|
$.each(hasImgProperties, function(i, property) {
|
|
var propertyValue = element.css(property);
|
|
// If it doesn't contain this property, skip.
|
|
if ( ! propertyValue) {
|
|
return true;
|
|
}
|
|
|
|
// Get all url() of this element.
|
|
var match;
|
|
while (match = matchUrl.exec(propertyValue)) {
|
|
allImgs.push({
|
|
src: match[2],
|
|
element: element[0]
|
|
});
|
|
};
|
|
});
|
|
});
|
|
} else {
|
|
// For images only, the task is simpler.
|
|
obj
|
|
.find('img:uncached')
|
|
.each(function() {
|
|
allImgs.push({
|
|
src: this.src,
|
|
element: this
|
|
});
|
|
});
|
|
};
|
|
|
|
var allImgsLength = allImgs.length,
|
|
allImgsLoaded = 0;
|
|
|
|
// If no images found, don't bother.
|
|
if (allImgsLength == 0) {
|
|
finishedCallback.call(obj[0]);
|
|
};
|
|
|
|
$.each(allImgs, function(i, img) {
|
|
|
|
var image = new Image;
|
|
|
|
// Handle the image loading and error with the same callback.
|
|
$(image).bind('load.' + eventNamespace + ' error.' + eventNamespace, function(event) {
|
|
allImgsLoaded++;
|
|
|
|
// If an error occurred with loading the image, set the third argument accordingly.
|
|
eachCallback.call(img.element, allImgsLoaded, allImgsLength, event.type == 'load');
|
|
|
|
if (allImgsLoaded == allImgsLength) {
|
|
finishedCallback.call(obj[0]);
|
|
return false;
|
|
};
|
|
|
|
});
|
|
|
|
image.src = img.src;
|
|
});
|
|
});
|
|
};
|
|
})(jQuery);
|