Fires before this menu displays. Canceling this event prevents the menu from displaying.
Context Variables
objEVENT {
jsx3.gui.Event} - the browser event that triggers this event.
objANCHOR {
HTMLElement} - the on-screen HTML element next to which the menu displays. May be
null if a context menu or invoked by a hot key.
intINDEX {
int} - the 1-based nesting index of the menu. The root menu or context menu is 1. Nested menus are 2, 3, 4, and so on. May be
null if invoked by hot key.
strPARENTID {
String} - the CDF jsxid of the menu item expanding to show a nested menu. May be
null if a top-level menu.