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Changing TreeList ScrollHeight at Runtime to Fill its Container Height

In a RadTreeList control with scrolling enabled, you can modify
the default treelist scroll height to match the height of its container element.
The following steps describe how to achieve this:

  1. Create a handler for the client-side TreeListCreated event.

  2. In the TreeListCreated event handler, use the treelist's dataDiv to obtain a reference to the DOM element for the treelist's scrollable region.

  3. Alter the style.height attribute of this DOM element to make it equal the height of the treelist's container element. Note that if static headers are enabled you will have to take into account the header height.

The following example illustrates this technique:

<script type="text/javascript">
   function TreeListCreated(sender, args) {
       var scrollArea = $get(sender.get_element().id + '_rtlData');
       var parent = $get("treelistContainer")
       var header = $get(sender.get_element().id + '_rtlHeader')
       scrollArea.style.height = parent.clientHeight - header.clientHeight + "px";
   }
</script>
  <div style="height: 500px; width: 800px" id="treelistContainer">
    <telerik:RadTreeList RenderMode="Lightweight" ID="RadTreeList1" runat="server" DataSourceID="SqlDataSource1"
        AutoGenerateColumns="true" DataKeyNames="EmployeeID" ParentDataKeyNames="ReportsTo">
        <ClientSettings>
            <Scrolling AllowScroll="true" UseStaticHeaders="true" ScrollHeight="300px" />
            <ClientEvents OnTreeListCreated="TreeListCreated" />
        </ClientSettings>
    </telerik:RadTreeList>
</div>
<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
    SelectCommand="SELECT EmployeeID, FirstName, LastName, ReportsTo FROM [Employees]" />