一个openlaszlo添加删除树节点的例子

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

1. <canvas debug="true" fontsize="12">  
2.     <include href="lz/tree.lzx"/>  
3.     <dataset name="treedata">  
4.         <root>  
5.             <project name="演示方案" isleaf="false">  
6.                 <scheme name="业务模型一" isleaf="false">  
7.                     <item name="业务协作流程图" isleaf="true"/>                   
8.                     <item name="组织机构图" isleaf="true"/>                     
9.                 </scheme>  
10.                 <scheme name="业务模型二" isleaf="false">  
11.                     <item name="业务协作流程图" isleaf="true"/>                   
12.                     <item name="组织机构图" isleaf="true"/>                         
13.                 </scheme>  
14.             </project>     
15.             <project name="视频" isleaf="false">  
16.                 <scheme name="视频分类一" isleaf="false">  
17.                     <item name="视频一" isleaf="true"/>                   
18.                 </scheme>  
19.                 <scheme name="视频分类二" isleaf="false">  
20.                     <item name="视频一" isleaf="true"/>                   
21.                 </scheme>  
22.             </project>  
23.             <project name="图片" isleaf="false">  
24.                 <scheme name="图片分类一" isleaf="false">  
25.                     <item name="图片一" isleaf="true"/>                   
26.                 </scheme>  
27.                 <scheme name="图片分类二" isleaf="false">  
28.                     <item name="图片一" isleaf="true"/>                   
29.                 </scheme>  
30.             </project>  
31.         </root>        
32.     </dataset>  
33.     <handler name="oninit">  
34.         canvas.treecontainer.projecttree.datapath.setPointer(treedata.childNodes[0]);   
35.     </handler>  
36.     <!--*** save the selected item ***-->  
37.     <attribute name="selecteditem" value="null"/>  
38.     <button name="adddir" x="0" y="4" text="Add Dir" height="24">  
39.         <handler name="onclick">  
40.             if(canvas.selecteditem==null){   
41.                var projectnode = new LzDataElement('project');   
42.                projectnode.setAttr('name','NEW DIR');   
43.                projectnode.setAttr('isleaf',false);   
44.                canvas.treecontainer.projecttree.datapath.p.appendChild(projectnode);   
45.             }   
46.         </handler>  
47.     </button>  
48.     <button name="deldir" x="80" y="4" text="Del Dir" height="24">  
49.         <handler name="onclick">  
50.             if(canvas.selecteditem!=null){   
51.                 canvas.selecteditem.deleteNode();   
52.                 canvas.selecteditem = null;   
53.             }   
54.         </handler>  
55.     </button>  
56.     <view name="treecontainer" x="10" y="30" width="200" height="400" bgcolor="#F5F5F5" clip="true">  
57.         <tree name="projecttree" text="分类目录" datapath="" isleaf="false" open="true">  
58.             <tree datapath="*"  text="$path{'@name'}" xindent="20" y="18" closesiblings="false" expander="lztree_plusminus_rsc" isleaf="$path{'@isleaf'}">  
59.                 <handler name="onclick">  
60.                     canvas.selecteditem =this.datapath;   
61.                 </handler>  
62.             </tree>  
63.         </tree>  
64.         <scrollbar/>  
65.     </view>    
66. </canvas>