onBeforeContextMenu

fires before the moment when a context menu appears by the right mouse click

zoneId	string|number	id of the context menu zone
ev	Event	native window event object

Example

myMenu.attachEvent("onBeforeContextMenu", function(zoneId,ev){
    // your code here
    // returning "true" allows a context menu to be shown, "false" - cancels showing
    return true;
});

The event is cancellable: to show a context menu you need to "return true"

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