Me.WebTab1.ClientEvents.AjaxSubmitting = "WebTab1_AjaxSubmitting"
this.WebTab1.ClientEvents.AjaxSubmitting = "WebTab1_AjaxSubmitting";
// The client event AjaxSubmitting takes two parameters sender and e // sender is the object which is raising the event // e is the TabItemCancelEventArgs function WebTab1_AjaxSubmitting(sender, e) { var tab = sender; //Gets the index of the tab raising the client event var tabIndex = e.get_tabIndex(); //Gets the collection of tabs var tabs = tab.get_tabs(); //Gets the text of the tab raising the event var tabText = tabs[tabIndex].get_text(); //Assuming you have a label called labelOutput on the form var label = $get('labelOutput'); if (tabIndex == 4) { //Cancels the client event e.set_cancel(true); label.innerHTML = "Ajax request cancelled!"; } else label.innerHTML = "AjaxSubmitting for tab " + tabText + "..."; }