Load On Demand - get lowest level when parent is checked

[Logan]

I have a RadTreeView that loads nodes on demand via a web service.  Only the node at the very bottom level has a value, which is what I need to retrieve.  If the user checks a node and then expands it, it's children will be checked all the way to the lowest level, and the value will be provided.  However, here is my problem: When the user selects a parent node (that is NOT expanded) I cannot figure out how to get the value of its children's lowest level nodes.  Essentially, when a node is selected I need it to retrieve and check all of its children.  Is this possible?

[Shinu]

Hi,

Try the following code.

JS:

function OnClientNodeClicked(sender, args)
 {

 var currentNode = args.get_node();

 if (args.get_node()._hasChildren())
   {

  var allNodes = currentNode.get_allNodes();

  if (currentNode.get_checked())
      {

  for (var i = 0; i < allNodes.length; i++)
       {

   allNodes[i].set_checked(false);

   currentNode.set_checked(false);

  }

   }

  else
      {

   for (var i = 0; i < allNodes.length; i++)
        {

    allNodes[i].set_checked(true);

    currentNode.set_checked(true);

    }

   }

   alert(args.get_node().get_lastChild().get_text()); // to get the last node of selected parent.

 }
 }


Thanks,
Shinu.

[Logan]

Shinu, 

Thank you for the reply.  The problem I am having with the code you provided is that:

args.get_node()._hasChildren()


returns false until the node is expanded and its children are loaded from the web service.  This is the main problem that I am running into.  My original idea was to force the node to expand, however .ExpandChildNodes() does not work with web service load on demand, and I cannot find any way to expand a node programatically.
. 

[Shinu]

Hi,

To expand a node programatically please have a look into the following help documetation.
Load On Demand expand on server-side Node click

Thanks,
Shinu.

[Logan]

Is it possible to expand the node being clicked AND the nodes that are being loaded from node.expand()? 

[Kate]

Hello Logan,

Please try using the approach  described in this help article - Expanding Nodes on a Single Click

Regards,
Kate
Telerik