TreeGrid isLeaf function ??

[jerry426]

using SmartClient 8.3

I'm trying to implement this function in a TreeGrid to prevent removal of a node if the node is a folder (has child nodes):

removeSelectedNodeIfNoChildrenExist: function(data, node) {
   if (this.data.isLeaf(node)) {
      isc.say("huh");
   //this.removeSelectedData();
   }
}

Problem is, in my example code above, it always executes the code in my if block regardless of whether the node is a leaf or has children.

So, I have two questions:

1. What am I doing wrong with my client side code?

2. How would I go about preventing deletion of a node with child nodes via some bit of magic in my server side data source declaration? I suspect I would put something in the "remove" operationBinding, but need help on what that would look like.

Thanks for any help!
Jerry

[jerry426]

partially solved by hacked workaround...

Ok... so I solved part of my problem for now by creating a client-side function which fetches child records which then allows me to get the length of the returned data array. Here's what I did:

   function setChildGroupVariables(groupId) {
      isc.DataSource.get("Groups").fetchData({groupParentId: groupId},
      function(dsResponse, data) {
         childGroupCount = data.length;
      });
   }

which then lets me use the childGroupCount elsewhere as a boolean. I'm sure there's a cleaner way to do this and with luck I'll stumble across it later.

However, if anyone could point me in a direction toward preventing deletion of a node whenever that node has child records (it's a self referential parent/child relationship in a single table) by some magic in my server side DataSource declaration xml file I would be most grateful!

Thanks,
Jerry