Invoking a pull tool method on click

["Harriett Y. Xing (HYX)" <Xi...@EBRINC.COM>]

Hi,

I have a pull tool $adminMenu with method toggleFolderOpen().

What I would like to do is to invoke the method whenever a user clicks on
the following link.  I would like for the user to stay on the same screen
instead of being redirected to a different page.

<a href="invoking $adminMenu.toggleFolderOpen()"> Questions </a> 

I know this is kind of convoluted.  I am trying to implement a treeview as
the navigation menu.  $adminMenu.toggleFolderOpen() updates the variable
that tracks if the folder is open or collapsed.


  
Is there a way to accomplish this?

Thanks.


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RE: Invoking a pull tool method on click

[David Demner <tu...@demner.com>]

Hi,

I don't think you can do this with a pull tool, as it doesn't really fit
with what a pull tool is.  From
http://jakarta.apache.org/turbine/turbine-2.3/howto/pullmodel-howto.html:

"Java programmers can create globally accessible Java classes known as
Tools. These Tools are going to be useful for getting data out of a service
and bringing it to the presentation layer, authenticating users, or creating
links (see the TemplateLink tool that is built into Turbine). "

However, you can do it in a few other ways.

---- Solely in the velocity template (using the pull tool to get the nodes)
----

#if ($data.Parameters.ExpandQuestions == "1")
   <a href="$link.setPage("TreeView.vm").addQueryData("ExpandQuestions",
"0")">Questions</a>
   <!-- whatever nodes go here - probably a foreach loop that accesses your
pull tool-->
#else
   <a href="$link.setPage("TreeView.vm").addQueryData("ExpandQuestions",
"1")">Questions</a>
#end

---- Using the .vm java class (if you need to process something in java)
----

* In your .vm file:

<a href="$link.setPage("TreeView.vm").addQueryData("ExpandQuestions",
1)">Questions</a>

* In a java class called TreeView.java:

public class TreeView extends SecureScreen
{
   public void doBuildTemplate( RunData data, Context context )
   {
      super.doBuildTemplate( data, context );
	if (StringUtils.equals(data.getParameters().get("ExpandQuestions"),
"1")) {
          //whatever you need to get the data for the expanded tree node 
          //Store in List/Vector/HashMap/Array
          //Put the results into context for access from the template
          context.put("questionList", List/Vector/HashMap/Array);
      }
   }
}

---- Using an action (not really what an action is for, but it works) ----

* In your .vm file:

<a href="$link.setAction("AdminSQL").setPage("TreeView.vm")">Questions</a>

* In a java class:

public class AdminSQL extends SecureAction
{
    public void doPerform(RunData data, Context context)
        throws Exception
    {
	//whatever processing you want and store in
List/Vector/HashMap/Array
	//and then put the results into context
	context.put("questionList", List/Vector/HashMap/Array);
    }
}
-------------------------------

The objects you add to the Context from either java class will be available
in the .vm template.

Good luck,

David


-----Original Message-----
From: Harriett Y. Xing (HYX) [mailto:Xing@EBRINC.COM] 
Sent: Friday, January 16, 2004 2:14 PM
To: 'Turbine Users List'
Subject: Invoking a pull tool method on click


Hi,

I have a pull tool $adminMenu with method toggleFolderOpen().

What I would like to do is to invoke the method whenever a user clicks on
the following link.  I would like for the user to stay on the same screen
instead of being redirected to a different page.

<a href="invoking $adminMenu.toggleFolderOpen()"> Questions </a> 

I know this is kind of convoluted.  I am trying to implement a treeview as
the navigation menu.  $adminMenu.toggleFolderOpen() updates the variable
that tracks if the folder is open or collapsed.


  
Is there a way to accomplish this?

Thanks.


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