/**
 * 1）擴(kuò)展jquery easyui tree的節(jié)點(diǎn)檢索方法。使用方法如下：
 * $("#treeId").tree("search", searchText);	 
 * 其中，treeId為easyui tree的根UL元素的ID，searchText為檢索的文本。
 * 如果searchText為空或""，將恢復(fù)展示所有節(jié)點(diǎn)為正常狀態(tài)
 */
(function($) {	
	
	$.extend($.fn.tree.methods, {
		/**
		 * 擴(kuò)展easyui tree的搜索方法
		 * @param tree easyui tree的根DOM節(jié)點(diǎn)(UL節(jié)點(diǎn))的jQuery對象
		 * @param searchText 檢索的文本
		 * @param this-context easyui tree的tree對象
		 */
		search: function(jqTree, searchText) {
			//easyui tree的tree對象。可以通過tree.methodName(jqTree)方式調(diào)用easyui tree的方法
			var tree = this;
			
			//獲取所有的樹節(jié)點(diǎn)
			var nodeList = getAllNodes(jqTree, tree);
			
	 		//如果沒有搜索條件，則展示所有樹節(jié)點(diǎn)
			searchText = $.trim(searchText);
	 		if (searchText == "") {
	 			for (var i=0; i<nodeList.length; i++) {
	 				$(".tree-node-targeted", nodeList[i].target).removeClass("tree-node-targeted");
	 	 			$(nodeList[i].target).show();
	 	 		}
	 			//展開已選擇的節(jié)點(diǎn)（如果之前選擇了）
	 			var selectedNode = tree.getSelected(jqTree);
	 			if (selectedNode) {
	 				tree.expandTo(jqTree, selectedNode.target);
	 			}
	 			return;
	 		}
	 		
	 		//搜索匹配的節(jié)點(diǎn)并高亮顯示
	 		var matchedNodeList = [];
	 		if (nodeList && nodeList.length>0) {
	 			var node = null;
	 			for (var i=0; i<nodeList.length; i++) {
	 				node = nodeList[i];
	 				if (isMatch(searchText, node.text)) {
	 					matchedNodeList.push(node);
	 				}
	 			}
	 			
	 			//隱藏所有節(jié)點(diǎn)
	 	 		for (var i=0; i<nodeList.length; i++) {
	 	 			$(".tree-node-targeted", nodeList[i].target).removeClass("tree-node-targeted");
	 	 			$(nodeList[i].target).hide();
	 	 		} 			
	 			
	 			//折疊所有節(jié)點(diǎn)
	 	 		tree.collapseAll(jqTree);
	 			
	 			//展示所有匹配的節(jié)點(diǎn)以及父節(jié)點(diǎn) 			
	 			for (var i=0; i<matchedNodeList.length; i++) {
	 				showMatchedNode(jqTree, tree, matchedNodeList[i]);
	 			}
	 		} 	 
		},
		
		/**
		 * 展示節(jié)點(diǎn)的子節(jié)點(diǎn)（子節(jié)點(diǎn)有可能在搜索的過程中被隱藏了）
		 * @param node easyui tree節(jié)點(diǎn)
		 */
		showChildren: function(jqTree, node) {
			//easyui tree的tree對象?？梢酝ㄟ^tree.methodName(jqTree)方式調(diào)用easyui tree的方法
			var tree = this;
			
			//展示子節(jié)點(diǎn)
			if (!tree.isLeaf(jqTree, node.target)) {
				var children = tree.getChildren(jqTree, node.target);
				if (children && children.length>0) {
					for (var i=0; i<children.length; i++) {
						if ($(children[i].target).is(":hidden")) {
							$(children[i].target).show();
						}
					}
				}
			} 	
		},
		
		/**
		 * 將滾動(dòng)條滾動(dòng)到指定的節(jié)點(diǎn)位置，使該節(jié)點(diǎn)可見（如果有滾動(dòng)條才滾動(dòng)，沒有滾動(dòng)條就不滾動(dòng)）
		 * @param param {
		 * 	 treeContainer: easyui tree的容器（即存在滾動(dòng)條的樹容器）。如果為null，則取easyui tree的根UL節(jié)點(diǎn)的父節(jié)點(diǎn)。
		 *  targetNode: 將要滾動(dòng)到的easyui tree節(jié)點(diǎn)。如果targetNode為空，則默認(rèn)滾動(dòng)到當(dāng)前已選中的節(jié)點(diǎn)，如果沒有選中的節(jié)點(diǎn)，則不滾動(dòng)
		 * } 
		 */
		scrollTo: function(jqTree, param) {
			//easyui tree的tree對象?？梢酝ㄟ^tree.methodName(jqTree)方式調(diào)用easyui tree的方法
			var tree = this;
			
			//如果node為空，則獲取當(dāng)前選中的node
			var targetNode = param && param.targetNode ? param.targetNode : tree.getSelected(jqTree);
			
			if (targetNode != null) {
				//判斷節(jié)點(diǎn)是否在可視區(qū)域				
				var root = tree.getRoot(jqTree);
				var $targetNode = $(targetNode.target);
				var container = param && param.treeContainer ? param.treeContainer : jqTree.parent();
				var containerH = container.height();
				var nodeOffsetHeight = $targetNode.offset().top - container.offset().top;
				if (nodeOffsetHeight > (containerH - 30)) {
					var scrollHeight = container.scrollTop() + nodeOffsetHeight - containerH + 30;
					container.scrollTop(scrollHeight);
				}							
			}
		}
	});
	
	
	
	
	/**
	 * 展示搜索匹配的節(jié)點(diǎn)
	 */
	function showMatchedNode(jqTree, tree, node) {
 		//展示所有父節(jié)點(diǎn)
 		$(node.target).show();
 		$(".tree-title", node.target).addClass("tree-node-targeted");
 		var pNode = node;
 		while ((pNode = tree.getParent(jqTree, pNode.target))) {
 			$(pNode.target).show(); 			
 		}
 		//展開到該節(jié)點(diǎn)
 		tree.expandTo(jqTree, node.target);
 		//如果是非葉子節(jié)點(diǎn)，需折疊該節(jié)點(diǎn)的所有子節(jié)點(diǎn)
 		if (!tree.isLeaf(jqTree, node.target)) {
 			tree.collapse(jqTree, node.target);
 		}
 	} 	 
	
	/**
	 * 判斷searchText是否與targetText匹配
	 * @param searchText 檢索的文本
	 * @param targetText 目標(biāo)文本
	 * @return true-檢索的文本與目標(biāo)文本匹配；否則為false.
	 */
	function isMatch(searchText, targetText) {
 		return $.trim(targetText)!="" && targetText.indexOf(searchText)!=-1;
 	}
	
	/**
	 * 獲取easyui tree的所有node節(jié)點(diǎn)
	 */
	function getAllNodes(jqTree, tree) {
		var allNodeList = jqTree.data("allNodeList");
		if (!allNodeList) {
			var roots = tree.getRoots(jqTree);
 			allNodeList = getChildNodeList(jqTree, tree, roots);
 			jqTree.data("allNodeList", allNodeList);
		}
 		return allNodeList;
 	}
 	
	/**
	 * 定義獲取easyui tree的子節(jié)點(diǎn)的遞歸算法
	 */
 	function getChildNodeList(jqTree, tree, nodes) {
 		var childNodeList = [];
 		if (nodes && nodes.length>0) { 			
 			var node = null;
 			for (var i=0; i<nodes.length; i++) {
 				node = nodes[i];
 				childNodeList.push(node);
 				if (!tree.isLeaf(jqTree, node.target)) {
 					var children = tree.getChildren(jqTree, node.target);
 					childNodeList = childNodeList.concat(getChildNodeList(jqTree, tree, children));
 				}
 			}
 		}
 		return childNodeList;
 	}
})(jQuery);