nui UI 具有右键属性的菜单树

参考示例：树右键菜单

          
一：创建ContextMenu    

<ul id="treeMenu" class="nui-contextmenu"  onbeforeopen="onBeforeOpen">       
    <li iconCls="icon-move" onclick="onMoveNode">移动节点</li>
    <li class="separator"></li>
    <li>
        <span iconCls="icon-add">新增节点</span>
        <ul>
            <li onclick="onAddBefore">插入节点前</li>               
            <li onclick="onAddAfter">插入节点后</li>   
            <li onclick="onAddNode">插入子节点</li>                
        </ul>
    </li>
    <li name="edit" iconCls="icon-edit" onclick="onEditNode">编辑节点</li>
    <li name="remove" iconCls="icon-remove" onclick="onRemoveNode">删除节点</li>       
</ul>

          
二：设置contextmenu  

<ul id="tree1" class="nui-tree" url="../data/tree.txt" style="width:200px;padding:5px;"
    showTreeIcon="true" textField="text" idField="id"
    contextMenu="#treeMenu">       
</ul>

         
三：监听beforeopen事件  

function onBeforeOpen(e) {
    var menu = e.sender;
    var tree = nui.get("tree1");

    var node = tree.getSelectedNode();
    if (!node) {
        e.cancel = true;
    }
    if (node && node.text == "Base") {
        e.cancel = true;
        //阻止浏览器默认右键菜单
        e.htmlEvent.preventDefault();
        return;
    }

    ////////////////////////////////
    var editItem = nui.getbyName("edit", menu);
    var removeItem = nui.getbyName("remove", menu);
    editItem.show();
    removeItem.enable();

    if (node.id == "forms") {
        editItem.hide();
    }
    if (node.id == "lists") {
        removeItem.disable();
    }
}