Add XHR2 callback support

[spectras]

Hello,

I started using DexterJS for testing my ajax requests, and I really enjoy it so far. However, I am using JQuery 2 and I found out that the only callback supported in master is onreadystatechange. Unfortunately, JQuery2 wants to use onload and friends.

I quickly tweaked my local copy's __DexterStateChange to invoke onload when switching the state to DONE. That gets me going for now, but it is by no mean a clean solution. Proper support for the new callbacks would be awesome if someone fins the time to do it.

[leobalter]

:+1:

working on it, thanks

edit: For further reference: https://github.com/jquery/jquery/blob/master/src/ajax/xhr.js#L77-L110

[spectras]

Great! By the way, you might be interested to know it works fine with Backbone. Here are some gotchas that might find their way into the documentation by the way:

• I added fakeXHR.requests = [] to my QUnit module's setup to ensure my tests are independent. Otherwise, I might end up responding to requests from another testcase. If fakeXHR.requests is considered as an internal api, maybe it would be useful to add an accessor method?
• I use requireJS:
  • I looked for fakeXHR for a while before I realized I had to add it as a requirement (define(['fakeXHR', 'dexter', ...] function (fakeXHR, dexter, ...) {).
  • to have fakeXHR work fine it needs a fakeXHR: "dexter" entry in the path configuration so it knows it is loaded from the same file as dexter.
  • apart from that, dexterjs plays surprinsingly well with requireJS.

[leobalter]

@luanmuniz help \o/

[luanmuniz]

working on it :)

[leobalter]

@raphamorim wanna try this challenge too? :)