OnClientSelectedIndexChanged

The OnClientSelectedIndexChanged client-side event occurs immediately after the SelectedItem has been changed.

The event handler receives two parameters:

1. The instance of the DropDownList firing the event.

2. An eventArgs parameter containing the following method:

   • get_index() returns the index of the item, that has just been selected.

Use this event to respond to the newly selected item:

ASPNET

<script type="text/javascript">
    function OnClientSelectedIndexChanged(sender, eventArgs) {
        alert("You selected item with index : " + eventArgs.get_index());
    }
</script>

<telerik:RadDropDownList
    ID="RadDropDownList1"
    runat="server"
    OnClientSelectedIndexChanged="OnClientSelectedIndexChanged">
    <Items>
        <telerik:DropDownListItem Text="Item 1" Value="1" />
        <telerik:DropDownListItem Text="Item 2" Value="2" />
        <telerik:DropDownListItem Text="Item 3" Value="3" />
        <telerik:DropDownListItem Text="Item 4" Value="4" />
    </Items>
</telerik:RadDropDownList>