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The following article demonstrates the usage of the OnClientItemCreated client-side event of the RadTreeMap.

The OnClientItemCreated client-side event of the RadTreeMap is fired for each of the RadTreeMapItems in the collection of items. The event could be very useful, for example, if you want to set a specific color for a given item.

The event handler receives two parameter:

  1. The instance of the RadTreeMap control firing the event.

  2. Event arguments — an event arguments object that exposes the following methods:

ClientItemCreated Event Arguments Object

Name Parameters Return Type Description
get_dataItem() DataItem Gets reference to the DataItem object (data container), exposing Text and Value for the currently evaluated item, along with any values set for the DataKeyNames collection.
get_element() DOM Element Returns the DOM element of the div, which the currently evaluated RadTreeMapItem is rendered in.
get_kendoWidget() KendoTreeMap Gets a reference to the KendoTreeMap object.

Example 1: Handle the RadTreeMap's client-side OnClientItemCreated event to set a specific color for a given item.

<script type="text/javascript">
function OnClientItemCreated(sender, eventArgs) {
    if (eventArgs.get_dataItem().text == "Important Item") {
        eventArgs.get_element().style.backgroundColor = "red";
<telerik:RadTreeMap RenderMode="Lightweight" runat="server" ID="RadTreeMap1" OnClientItemCreated="OnClientItemCreated">
        <telerik:TreeMapItem Text="Parent Item">
                <telerik:TreeMapItem Text="Item 1" Value="6">
                        <telerik:TreeMapItem Text="Important Item" Value="3"></telerik:TreeMapItem>
                        <telerik:TreeMapItem Text="Sub Item 1.2" Value="2"></telerik:TreeMapItem>
                        <telerik:TreeMapItem Text="Sub Item 1.3" Value="1"></telerik:TreeMapItem>
                <telerik:TreeMapItem Text="Item 2" Value="4">
                        <telerik:TreeMapItem Text="Sub Item 2.1" Value="5"></telerik:TreeMapItem>
                        <telerik:TreeMapItem Text="Sub Item 2.2" Value="2"></telerik:TreeMapItem>
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