[mapguide-users] Fusion.Event.MAP_EXTENTS_CHANGED throws error

[GordonL]

Hi, I am just trying to grab the current scale when the user zooms in and out
- but after the code runs once, successfully, to throws the following error:

Message: 'this.events[...][...]' is null or not an object
Line: 110
Char: 13
Code: 0
URI: http://localhost/mapguide2010/fusion/lib/EventMgr.js

the code:

mapWidget.registerForEvent(Fusion.Event.MAP_EXTENTS_CHANGED,
alert(mapWidget.getScale()));


the code works great, once.
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