一个openlaszlo添加删除树节点的例子

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应一位网友的要求，做了这个例子，实现添加删除目录，但是没有象他那样去移动按钮的位置。

xml 代码

<canvas debug="true" fontsize="12">
    <include href="lz/tree.lzx"/>
    <dataset name="treedata">
        <root>
            <project name="演示方案" isleaf="false">
                <scheme name="业务模型一" isleaf="false">
                    <item name="业务协作流程图" isleaf="true"/>
                    <item name="组织机构图" isleaf="true"/>
                scheme>
                <scheme name="业务模型二" isleaf="false">
                    <item name="业务协作流程图" isleaf="true"/>
                    <item name="组织机构图" isleaf="true"/>
                scheme>
            project>
            <project name="视频" isleaf="false">
                <scheme name="视频分类一" isleaf="false">
                    <item name="视频一" isleaf="true"/>
                scheme>
                <scheme name="视频分类二" isleaf="false">
                    <item name="视频一" isleaf="true"/>
                scheme>
            project>
            <project name="图片" isleaf="false">
                <scheme name="图片分类一" isleaf="false">
                    <item name="图片一" isleaf="true"/>
                scheme>
                <scheme name="图片分类二" isleaf="false">
                    <item name="图片一" isleaf="true"/>
                scheme>
            project>
        root>
    dataset>
    <handler name="oninit">
        canvas.treecontainer.projecttree.datapath.setPointer(treedata.childNodes[0]);
    handler>

    <attribute name="selecteditem" value="null"/>
    <button name="adddir" x="0" y="4" text="Add Dir" height="24">
        <handler name="onclick">
            if(canvas.selecteditem==null){
               var projectnode = new LzDataElement('project');
               projectnode.setAttr('name','NEW DIR');
               projectnode.setAttr('isleaf',false);
               canvas.treecontainer.projecttree.datapath.p.appendChild(projectnode);
            }
        handler>
    button>
    <button name="deldir" x="80" y="4" text="Del Dir" height="24">
        <handler name="onclick">
            if(canvas.selecteditem!=null){
                canvas.selecteditem.deleteNode();
                canvas.selecteditem = null;
            }
        handler>
    button>
    <view name="treecontainer" x="10" y="30" width="200" height="400" bgcolor="#F5F5F5" clip="true">
        <tree name="projecttree" text="分类目录" datapath="" isleaf="false" open="true">
            <tree datapath="*"  text="$path{'@name'}" xindent="20" y="18" closesiblings="false" expander="lztree_plusminus_rsc" isleaf="$path{'@isleaf'}">
                <handler name="onclick">
                    canvas.selecteditem =this.datapath;
                handler>
            tree>
        tree>
        <scrollbar/>
    view>
canvas>