javascript - AngularJS promise not resolving file with FileReader

I am trying to write a very simple function in my service that will create a FileReader, read the small image file I send it and return this result in a promise to my controller. The file gets to my service just fine. It gets to my controller and logs just a blank line. I assume I am messing up the promise part of this somehow. Where am I going wrong there?

Service funtion --

this.fileRead  = function(file) {
    var deferred = $q.defer();

    var reader = new FileReader();
    reader.readAsDataURL(file);

    deferred.resolve(reader.result);

    return deferred.promise;

};

Controller function --

$scope.onFileSelect = function($files) {
     MyService.fileRead($files[0])
                  .then(function(result) {
                    console.log(result);
                 });

};

Answer

You have no onload event, so it doesn't actually return the read file data.

this.fileRead  = function(file) {
    var deferred = $q.defer();

    var reader = new FileReader();


    reader.onload = function() {
        deferred.resolve(reader.result);
    };

    reader.readAsDataURL(file);

    return deferred.promise;
};