Using Microsoft Virtual Earth combined with ASP.NET AJAX
· 2006-12-04 11:45 by Thijs Kroesbergen for Brokenwire.NET
If you’ve tried to combine both ASP.NET AJAX and Virtual Earth on one ASPX page, you may have encountered the following error:
Microsoft JScript runtime error: Sys.InvalioperationException: Object Microsoft already exists and is not a namespace.
This happens when you try to use a Virtual Earth (V4) map on a ajax enabled page. A possible solution is to revert to Virtual Earth V3, but then you can’t have a nice 3D map.
But, I found another solution!
The NON-working HTML code looks like this:
This is the code as suggested on the Virtual Earth Interactive SDK
Where the http://dev.virtualearth.net/mapcontrol/v4/mapcontrol.js javascript file is loaded from the header of the ASPX page.
But the following code does work:
Here the mapcontrol.js is loaded just below the AJAX scriptmanager. Because the AJAX scripts are loaded to the browser before the Virtual Earth scripts, the page now loads without errors.
I don’t know if this has any drawbacks, it just worked for me.
There is an all new ASP.NET AJAX Virtual Earth Mapping Server control that abstracts out all JavaScript from being written when implementing mapping. Go check it out at: http://simplovation.com/Page/WebMapsVE.aspx
— Chris Pietschmann 2007-10-20 02:25 #