javascript - Google.Maps.Event settings - Va versus Xa

Question

I am using an Event Listener that refer to the relatedTarget variable for Firefox or the toElement variable for Chrome and IE. But since I made that part of the code the parent variable changed. Why?

For example, before today I needed to use evt.Va.toElement to refer to the toElement variable but since this morning I need to use evt.Xa.toElement. Why did it change?

google.maps.event.addListener(polygon,"mouseout",function(evt){ // Mouseout
  if(evt.Xa.toElement){ // For Chrome and IE
    if(evt.Xa.toElement.id != "idName"){
     // Do something
    }
  } else {
    // Do something else
  }
}

Is there a way to use toElement or relatedTarget and be certain that it will always work?

Answer 1

evt.Xa is an undocumented property, and shouldn't be used for anything, it could change with any release of the API (the closure compiler reassigns the undocumented properties with each release). Only documented properties are safe to use in production code.