Problems Ajax-ifying the Tree component

[tmarx78]

Hello everyone!

I am using the tree component from:

http://wiki.apache.org/tapestry/Tapestry5TreeComponent

and added a zone parameter to the ActionLink in order to show the data of the 
selected element in the tree.

<t:Tree treeid='literal:demo' source="treeNodes" currentNode="node">
    <t:actionlink t:id="tree" context="node.identifier" zone="showSelection">
    ${node.name}
    </t:actionlink>
  </t:Tree>

<t:zone t:id="showSelection" t:update="show">
                        <table border="1">
                                <tr><td><b>XPath</b></td><td><b>Sample 
data</b></td></tr>
                                <tr><td>${xpath}</td><td>${sampleData}</td></tr>
                        </table>
                </t:zone><br/>


This leads to an error thats fades in and out again that says:

Exception invoking function Tapestry.Initializer.linkZone with parameters 
[{"linkId": "tree_199", "url": 
"/importer/mapping.tree/16?t:state:client=H4sIAAAAAAAAAEWOsUoDQRCGJ4kSxUKwsbG03vUUiWinIBy5iJDGdrgbL6u7e+vuGHONraUv4oMIPoG1tZ2VKDgHot0/MP/3f0/vsHy3BAC9FGHcxFphwHJGijFQ4tjuK+OZokerEsW5KSmpE2vI8znFZBJLOjVkqyk3EWvKXbDbY2pfPzYfh2+fD30YFLBWNi40Xl7zimGjuMI5aou+1lOOxtdHBaxedpAzdHQD99ArYCUI7e9ehMAwXDibMzlJEwxBiiK9VZGqUNxERcmCYSOKF5Oi+1z/fml3n0df/Y44uI32F8aQzZjDodYO3X+9Is1idkzltUPvdTbaO9jJVDBKln8AJSA8eCsBAAA=",
 "zoneId": "showSelection"}]: TypeError: $(element) is null

The Java code is:


        @InjectComponent
        private Zone showSelection;

        @Persist
        @Property
        private String xpath;

        @Persist
        @Property
        private String sampleData;

Object onActionFromTree(int index) {

                TreeNode node = this.getTreeNode(index);
                if (node != null) {

                        this.xpath = node.getXpath();
                        this.sampleData = node.getValue();
                } 

                return this.showSelection.getBody();
        }


Any ideas?

Thanks!

Tobias

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