Tip for debugging JavaScript metro apps

April 5, 2012 at 7:52 am | Posted in HTML/JavaScript, Metro, Visual Studio, Windows 8 | Leave a comment

With the release of the Windows 8 beta, I’ve been playing around again with metro apps made with HTML/JavaScript.  I was frustrated with debugging situations in which portions of code just didn’t seem to execute while displaying no error messages.  Then yesterday, I discovered this.  It explains that code with Promises deals with runtime errors in a special way and expects error handling routines to react to appropriately.

It is helpful to make sure that the Visual Studio menu item Debug > Exceptions > JavaScript Runtime > Thrown is selected.  This should expose errors that the runtime has detected but is ‘holding’ for some handling routine that is often not yet implemented.

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