WebDropDown1.ClientEvents.ActivationChanging = "WebDropDown_ActivationChanging"
WebDropDown1.ClientEvents.ActivationChanging = "WebDropDown_ActivationChanging";
// The client event 'ActivationChanging' takes two parameters sender and e // sender is the object which is raising the event // e is the DropDownActivationEventArgs function WebDropDown_ActivationChanging(sender, e) { //Gets the new active DropDownItem object var newActiveItem = e.getNewActiveItem(); //Gets the text of the new active item var newItemText = newActiveItem.get_text(); if (!confirm("Are you sure you want to activate the item '" + newItemText + "'?")) //Cancels the ActivationChanging event e.set_cancel(true); }