Version

DropDownOpening Property

Syntax
'Declaration
 
Public Property DropDownOpening As String
public string DropDownOpening {get; set;}
Example
WebDropDown1.ClientEvents.DropDownOpening = "WebDropDown_DropDownOpening"
WebDropDown1.ClientEvents.DropDownOpening = "WebDropDown_DropDownOpening";
// The client event 'DropDownOpening' takes two parameters sender and e
// sender  is the object which is raising the event
// e is the DropDownContainerEventArgs
function WebDropDown_DropDownOpening(sender, e) {

    if (!confirm("Are you sure you want to open the drop-down container?"))
    //Cancels the DropDownOpening event 
        e.set_cancel(true);
}
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also