バージョン

DropDownOpened プロパティ

シンタックス
'宣言
 
Public Property DropDownOpened As String
public string DropDownOpened {get; set;}
使用例
WebDropDown1.ClientEvents.DropDownOpened = "WebDropDown_DropDownOpened"
WebDropDown1.ClientEvents.DropDownOpened = "WebDropDown_DropDownOpened";
// The client event 'DropDownOpened' takes two parameters sender and e
// sender  is the object which is raising the event
// e is the DropDownContainerEventArgs
 function WebDropDown_DropDownOpened(sender, e) {

     //Returns the state of the drop-down container - 0=closed, 1= opened
     var visible = e.getVisible();

     if (visible == 0) {
         window.status = "DropDown Container Closed!";
     }
     else
         window.status = "DropDown Container Opened!";

 }
参照