下拉列表树

Ext.onReady(function(){
   Ext.QuickTips.init();
   //创建树形结构
   var tree = new Ext.tree.TreePanel({ 
      border:false, 
      autoScroll:true,
      animate:true,
      height: 270,
      width: 200,
      enableDD:false,
      containerScroll: true,
      rootVisible: false,
      loader: new Ext.tree.TreeLoader({
       dataUrl: '${pageContext.request.contextPath}/organizationAction!getCompanyCheckTree.ilf',       
      }),
      listeners:{
    checkchange:function(node,checked){
        if(checked){
         combo.setRawValue(node.text);
         combo.value = node.id;
         var arr=tree.getChecked();
         for(var i=0; i<arr.length; i++){
         var n=arr[i];
         if(node.id==n.id){continue;}
                  if(n.ui.isChecked()){
                     n.ui.toggleCheck();
                  }
      }
         selectMenu.hide();
        }
        }
   }
   });
   var root = new Ext.tree.AsyncTreeNode({
         text: '根节点',                 //节点名称
         draggable:true,                 //是否支持拖
         expanded: true
   });
   tree.setRootNode(root);
 var selectMenu = new Ext.menu.Menu({
  height: 270,
     width: 200,
     items: [tree]
 });
   var combo = new Ext.form.TriggerField({
     editable:false,
     fieldLabel: '选择',
     applyTo:'point',
     onTriggerClick: function () {
       if (this.menu == undefined) {
           this.menu = selectMenu;
       }
       this.menu.show(this.el, 'tl-bl?');
   }
 
 });

 
});