ItemSelecting プロパティ (DataMenuClientEvents)

// The client event 'ItemSelecting' takes two parameters sender and e
// sender  is the object which is raising the event
// e is the DataMenuItemCancelEventArgs

function WebDataMenu1_ItemSelecting(sender, e) {
    //Gets the DataMenuItem object that is going to be selected
    var Item = e.getItem();

    //Gets the text of the item
    var ItemText = Item.get_text();
    
    if (!confirm("Are you sure you want to select the item '"+ItemText+"'?"))
           //Cancels the ItemSelcting event
            e.set_cancel(true);

}