1 files changed, 58 insertions, 0 deletions
diff --git a/frontend/beta/js/YUI-extensions/tree/AsyncTreeNode.js b/frontend/beta/js/YUI-extensions/tree/AsyncTreeNode.js
new file mode 100644
index 0000000..5d48b00
--- a/dev/null
+++ b/frontend/beta/js/YUI-extensions/tree/AsyncTreeNode.js
@@ -0,0 +1,58 @@
+YAHOO.ext.tree.AsyncTreeNode = function(config){
+    this.loaded = false;
+    this.loading = false;
+    YAHOO.ext.tree.AsyncTreeNode.superclass.constructor.apply(this, arguments);
+    this.events['beforeload'] = true;
+    this.events['load'] = true;
+};
+YAHOO.extendX(YAHOO.ext.tree.AsyncTreeNode, YAHOO.ext.tree.TreeNode, {
+    expand : function(deep, anim, callback){
+        if(this.loading){ // if an async load is already running, waiting til it's done
+            var timer;
+            var f = function(){
+                if(!this.loading){ // done loading
+                    clearInterval(timer);
+                    this.expand(deep, anim, callback);
+                }
+            }.createDelegate(this);
+            timer = setInterval(f, 200);
+        }
+        if(!this.loaded){
+            if(this.fireEvent('beforeload', this) === false){
+                return;
+            }
+            this.loading = true;
+            this.ui.beforeLoad(this);
+            var loader = this.loader || this.attributes.loader || this.getOwnerTree().getLoader();
+            if(loader){
+                loader.load(this, this.loadComplete.createDelegate(this, [deep, anim, callback]));
+                return;
+            }
+        }
+        YAHOO.ext.tree.AsyncTreeNode.superclass.expand.call(this, deep, anim, callback);
+    },
+    
+    isLoading : function(){
+        return this.loading;  
+    },
+    
+    loadComplete : function(deep, anim, callback){
+        this.loading = false;
+        this.loaded = true;
+        this.ui.afterLoad(this);
+        this.fireEvent('load', this);
+        this.expand(deep, anim, callback);
+    },
+    
+    isLoaded : function(){
+        return this.loaded;
+    },
+    
+    hasChildNodes : function(){
+        if(!this.isLeaf() && !this.loaded){
+            return true;
+        }else{
+            return YAHOO.ext.tree.AsyncTreeNode.superclass.hasChildNodes.call(this);
+        }
+    }
+});