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The OnClientDropDownOpened client-side event occurs after the drop-down list has been opened.

The event handler receives two parameters:

  1. The instance of the DropDownList firing the event.

  2. An eventArgs parameter which does not have methods.

You can use this event to perform any client-side actions when the drop-down is completely opened:

<script type="text/javascript">
    function OnClientDropDownOpenedHandler(sender, eventArgs) {
        alert("The dropdown is opened now");
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