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The OnClientItemSelected client-side event occurs immediately after certain item is selected.

The event handler receives two parameters:

  1. The instance of the DropDownList firing the event.

  2. An eventArgs parameter containing the following method:

    • get_item returns the item, that has just been selected.

Use this event to respond to the newly selected item:

<script type="text/javascript">
    function OnClientItemSelected(sender, eventArgs) {

        var item = eventArgs.get_item();
        alert("You selected " + item.get_text() + " with value " + item.get_value());


<telerik:RadDropDownList RenderMode="Lightweight" ID="RadDropDownList1" runat="server" OnClientItemSelected="OnClientItemSelected">

        <telerik:DropDownListItem runat="server" Text="Item 1" Value="1" />
        <telerik:DropDownListItem runat="server" Text="Item 2" Value="2" />
        <telerik:DropDownListItem runat="server" Text="Item 3" Value="3" />
        <telerik:DropDownListItem runat="server" Text="Item 4" Value="4" />

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