How do I force a promise to be rejected in a .then() function?

Question

After making a call to a web API via WinJS.xhr (with a post), the response goes to the onComplete function provided in .then(). There I need to parse the response and determine whether or not a user was successfully logged in, and if so I need to store their user hash in app storage. This would be two Promise objects: First the one returned by WinJS.xhr and then possibly the one returned by Windows.ApplicationModel.roaming.writeText. What I can't figure out is how to combine these two in a way that allows me to return one promise object.

Answer 1

Hi,

I’m not very sure if this is what you want. You can use WinJS.Promise.join to create a single promise from multiple promises. I would like to suggest you to check http://msdn.microsoft.com/en-us/library/windows/apps/hh700330.aspx for a sample.

Best Regards,

Ming Xu.

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Answer 2

I figured out using throw does what I need and allows the chaining I'm looking for.