Feature: ajax load for tree commit log

vendor/assets/javascripts/jquery.waitforimages.js

@@ -0,0 +1,144 @@
+/*
+ * 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);