[Q] Unhandled rejection reasons (should be empty

[a.su...@gmail.com]

Hi

Today I've started using q as a deferred/promises library and began reading some docs and writing a post with the following example

var xhr = new XMLHttpRequest();

function request(){

  var def = Q.defer();

  xhr.open('GET', 'data1.json');

  xhr.send();

  xhr.onreadystatechange = solver;

  function solver(){

    if (xhr.readyState === 4) {

      if(xhr.status === 200){

        def.resolve();

      }else{

        def.reject( new Error('Error message') );

      }

    }

  }

  return def.promise;

}

req = request();

req.then(function(){

  console.log('done!');

},function(err){

  console.log('fail!');

});

If the request is ok everything works as expected BUT if the request fails the console displays the following 

GET http://dev.home/demos/deferreds/data1.json 404 (Not Found) scripts.js:9

XHR finished loading: "http://dev.home/demos/deferreds/data1.json". scripts.js:9

[Q] Unhandled rejection reasons (should be empty): ["Error: Error message↵    at XMLHttpRequest.solver (http://dev.home/demos/deferreds/scripts.js:17:21)"] libs.js:989

fail!

Searching across the web, I found I can hide the [Q]'s messages putting something like

Q.stopUnhandledRejectionTracking();

at the top of file, but still do not figure out why is this message for.

How can I adapt my example to not show this message? or is totally normal this kind of message?

[Nathan Stott]

Try chaining .done() onto the end of your .then like this:

req.then(function() { ... }, function() { ... }).done()

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[Alfredo Sumaran]

On Sun, Nov 10, 2013 at 9:26 PM, Nathan Stott <nrs...@gmail.com> wrote:

Try chaining .done() onto the end of your .then like this:

req.then(function() { ... }, function() { ... }).done()

The same result. I ended up putting

Q.stopUnhandledRejectionTracking();

But I'd like to know what is the reason of this message.

[Nathan Stott]

That should only happen when an error that is not handled by an attached rejection handler occurs iiuc.

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