Hooks for upload complete

[JulieGoldberg]

Is it possible to add a hook I can use when the upload is complete? I want to auto-submit the form as soon as it's done.

I can't add a change event to the file-url being set, since it's a hidden. So I've implemented a simple work-around -- checking if the url has a value, and trying every second once the file-input has been set. I did it simply with timeouts, though I'm sure I could have done it more elegantly with promises.

`
var maxChecksForUploadComplete = 360;
var submitFormOnceS3UploadIsComplete = function() {
if ($('.file-url').val()) {
return uploader.submitForm();
}
else if (maxChecksForUploadComplete) {
maxChecksForUploadComplete--;
return setTimeout(submitFormOnceS3UploadIsComplete, 1000)
}
else { //too many tries, exit the recursive loop
return;
}
}

$('.file-input').change(submitFormOnceS3UploadIsComplete);
`