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Posted to dev@beehive.apache.org by Srini <k_...@yahoo.com> on 2005/04/24 04:11:05 UTC
Help me out on netui:tree tag
Hi,
I am trying out an example with the <netui:tree> and <netui:treeItem> and <netui:treeLabel> tags
I am getting the following error
Caught exception when evaluating expression "{session.myTree}" with available binding contexts [actionForm, pageFlow, globalApp, request, session, application, pageContext, bundle, container, url, pageInput]. Root cause: java.lang.RuntimeException: Can not evaluate the identifier "myTree" on a null value object
I am trying to use the same example that is given in the documentation of netui:tree tag
<netui:tree
dataSource="pageflow.myTree"
selectionAction="treeState"
tagId="myTree">
<netui:treeItem expanded="true" >
<netui:treeLabel>Root Folder</netui:treeLabel>
<netui:treeItem expanded="false">
<netui:treeLabel>I</netui:treeLabel>
<netui:treeItem expanded="false">
<netui:treeLabel>A</netui:treeLabel>
<netui:treeItem>1</netui:treeItem>
<netui:treeItem>2</netui:treeItem>
</netui:treeItem>
</netui:treeItem>
</netui:treeItem>
</netui:tree>
Here is the code in controller.jpf
public Forward treeState() {
TreeElement rootNode = this.getMyTree();
String selectedNode = null;
String expandedNode = null;
selectedNode = getRequest().getParameter(TreeElement.SELECTED_NODE);
expandedNode = getRequest().getParameter(TreeElement.EXPAND_NODE);
if (expandedNode != null) {
TreeElement node = rootNode.findNode(expandedNode);
if (node != null) {
node.setExpanded(!node.isExpanded());
}
return new Forward("tree");
}
return new Forward(selectedNode);
}
I have "myTree" variable of type TreeElement in the controller.
I think an example of netui:tree on the beehive site will be very very helpful.
Thanks
Srini
Re: Help me out on netui:tree tag
Posted by Eddie O'Neil <ek...@bea.com>.
One other comment here; once the tree is exposed as a JavaBean
property as Daryl mentioned, it should be bound in the JSP with an
expression like:
pageFlow.myTree
NetUI stores the current JPF under the key "pageFlow" as a request
scoped JSP 2.0 EL implicit object. As such, the attribute key is case
sensitive.
Hope that helps.
Eddie
Daryl Olander wrote:
> In Beehive, the variables being bound to for all expressions must be
> properties and not member variables in the page flow.
>
> BTW, in Beehive the framework sill take care of selection/expansion
> for you if you bind to the same tree variable from request to request.
>
> On 4/23/05, Srini <k_...@yahoo.com> wrote:
>
>>Hi,
>>
>>I am trying out an example with the <netui:tree> and <netui:treeItem> and <netui:treeLabel> tags
>>
>>I am getting the following error
>>
>>Caught exception when evaluating expression "{session.myTree}" with available binding contexts [actionForm, pageFlow, globalApp, request, session, application, pageContext, bundle, container, url, pageInput]. Root cause: java.lang.RuntimeException: Can not evaluate the identifier "myTree" on a null value object
>>
>>I am trying to use the same example that is given in the documentation of netui:tree tag
>>
>><netui:tree
>> dataSource="pageflow.myTree"
>> selectionAction="treeState"
>> tagId="myTree">
>> <netui:treeItem expanded="true" >
>> <netui:treeLabel>Root Folder</netui:treeLabel>
>> <netui:treeItem expanded="false">
>> <netui:treeLabel>I</netui:treeLabel>
>> <netui:treeItem expanded="false">
>> <netui:treeLabel>A</netui:treeLabel>
>> <netui:treeItem>1</netui:treeItem>
>> <netui:treeItem>2</netui:treeItem>
>> </netui:treeItem>
>> </netui:treeItem>
>> </netui:treeItem>
>> </netui:tree>
>>
>>Here is the code in controller.jpf
>>
>> public Forward treeState() {
>> TreeElement rootNode = this.getMyTree();
>> String selectedNode = null;
>> String expandedNode = null;
>> selectedNode = getRequest().getParameter(TreeElement.SELECTED_NODE);
>> expandedNode = getRequest().getParameter(TreeElement.EXPAND_NODE);
>> if (expandedNode != null) {
>> TreeElement node = rootNode.findNode(expandedNode);
>> if (node != null) {
>> node.setExpanded(!node.isExpanded());
>> }
>> return new Forward("tree");
>> }
>> return new Forward(selectedNode);
>> }
>>
>>I have "myTree" variable of type TreeElement in the controller.
>>
>>I think an example of netui:tree on the beehive site will be very very helpful.
>>
>>Thanks
>>Srini
>>
>>
>
>
Re: Help me out on netui:tree tag
Posted by Daryl Olander <do...@gmail.com>.
In Beehive, the variables being bound to for all expressions must be
properties and not member variables in the page flow.
BTW, in Beehive the framework sill take care of selection/expansion
for you if you bind to the same tree variable from request to request.
On 4/23/05, Srini <k_...@yahoo.com> wrote:
> Hi,
>
> I am trying out an example with the <netui:tree> and <netui:treeItem> and <netui:treeLabel> tags
>
> I am getting the following error
>
> Caught exception when evaluating expression "{session.myTree}" with available binding contexts [actionForm, pageFlow, globalApp, request, session, application, pageContext, bundle, container, url, pageInput]. Root cause: java.lang.RuntimeException: Can not evaluate the identifier "myTree" on a null value object
>
> I am trying to use the same example that is given in the documentation of netui:tree tag
>
> <netui:tree
> dataSource="pageflow.myTree"
> selectionAction="treeState"
> tagId="myTree">
> <netui:treeItem expanded="true" >
> <netui:treeLabel>Root Folder</netui:treeLabel>
> <netui:treeItem expanded="false">
> <netui:treeLabel>I</netui:treeLabel>
> <netui:treeItem expanded="false">
> <netui:treeLabel>A</netui:treeLabel>
> <netui:treeItem>1</netui:treeItem>
> <netui:treeItem>2</netui:treeItem>
> </netui:treeItem>
> </netui:treeItem>
> </netui:treeItem>
> </netui:tree>
>
> Here is the code in controller.jpf
>
> public Forward treeState() {
> TreeElement rootNode = this.getMyTree();
> String selectedNode = null;
> String expandedNode = null;
> selectedNode = getRequest().getParameter(TreeElement.SELECTED_NODE);
> expandedNode = getRequest().getParameter(TreeElement.EXPAND_NODE);
> if (expandedNode != null) {
> TreeElement node = rootNode.findNode(expandedNode);
> if (node != null) {
> node.setExpanded(!node.isExpanded());
> }
> return new Forward("tree");
> }
> return new Forward(selectedNode);
> }
>
> I have "myTree" variable of type TreeElement in the controller.
>
> I think an example of netui:tree on the beehive site will be very very helpful.
>
> Thanks
> Srini
>
>