What happens with $q.all() when some calls work and others fail?

Question

What happens with $q.all() when some calls work and others fail?

I have the following code:

    var entityIdColumn = $scope.entityType.toLowerCase()          


        

Answer 1

It's been a while since this question was posted, but maybe my answer might still help someone. I solved a similar problem on my end by simply resolving all promises, but with a return I could process later and see if there were any errors. Here's my example used to preload some image assets:

var loadImg = function(imageSrc) {
    var deferred = $q.defer();

    var img = new Image();
    img.onload = function() {
        deferred.resolve({
            success: true,
            imgUrl: imageSrc
        });
    };
    img.onerror = img.onabort = function() {
        deferred.resolve({
            success: false,
            imgUrl: imageSrc
        });
    };
    img.src = imageSrc;

    return deferred.promise;
}

Later I can see which ones are errorious:

var promiseList = [];
for (var i = 0; i < myImageList.length; i++) {
    promiseList[i] = loadImg(myImageList[i]);
}
$q.all(promiseList).then(
    function(results) {
        for (var i = 0; i < results.length; i++) {
            if (!results[i].success) {
                // these are errors
            }
        }
    }
);