/**
 * 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(duì)象
     * @param searchText 檢索的文本
     * @param this-context easyui tree的tree對(duì)象
     */
    search: function(jqTree, searchText) {
      //easyui tree的tree對(duì)象?？梢酝ㄟ^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");
          $(nodeList[i].target).hide();
        }      
        //折疊所有節(jié)點(diǎn)
        tree.collapseAll(jqTree);
        //展示所有匹配的節(jié)點(diǎn)以及父節(jié)點(diǎn)      
        for (var i=0; i<matchedNodeList.length; i++) {
          showMatchedNode(jqTree, tree, matchedNodeList[i]);
        }
      }  
    },
    /**
     * 展示節(jié)點(diǎn)的子節(jié)點(diǎn)（子節(jié)點(diǎn)有可能在搜索的過程中被隱藏了）
     * @param node easyui tree節(jié)點(diǎn)
     */
    showChildren: function(jqTree, node) {
      //easyui tree的tree對(duì)象?？梢酝ㄟ^tree.methodName(jqTree)方式調(diào)用easyui tree的方法
      var tree = this;
      //展示子節(jié)點(diǎn)
      if (!tree.isLeaf(jqTree, node.target)) {
        var children = tree.getChildren(jqTree, node.target);
        if (children && children.length>0) {
          for (var i=0; i<children.length; i++) {
            if ($(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(duì)象。可以通過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);