How to upload a file using AngularJs like the traditional way - file-upload

Question

I've been tried this for days. Assuming I have a form like following:
<form ng-submit="create()" class="form-horizontal" enctype="multipart/form-data">
<div class="control-group">
<label class="control-label">name : </label>
<div class="controls">
<input type="text" class="input-xlarge" ng-model="message.title" />
</div>
</div>
<div class="control-group">
<label class="control-label">avatar : </label>
<div class="controls">
<input type="file" ng-model="message.avatar" name="message[avatar]" />
</div>
</div>
<div class="well">
<input class="btn btn-large btn-primary" type="submit" value="建立資料" />
</div>
</form>
I am using the carrierwave gem to handle the file upload behind the scene. My controller is like this:
$scope.create = function($scope.message){
var deferred = $q.defer();
$http({
method: 'POST',
url: '/resources/messages',
data: $.param({message: message}),
headers: {'Content-Type': 'multipart/form-data'}
}).
success(function(data, status, headers, config){
deferred.resolve(data);
}).
error(function(data, status, headers, config){
deferred.reject(status);
});
return deferred.promise;
};
However it is not working. What I intend to do is create a form and upload everything like the old way, but the examples I found such as ng-upload, or like this post, or jquery file upload, they don't suit my need. Is there any example or sample code for this purpose? Thank you.

Answer 1

I think "like the old way" would be to not use Ajax, but I'm guessing that's not what you mean. :)
#shaunhusain's fiddle is a good example of how to use the FormData object to handle the file upload. And using this site as a reference, you can use the transformRequest to incorporate the FormData object.
Keeping your basic $http code, modify it to add the transform object:
$scope.create = function(message){
var deferred = $q.defer();
$http({
method: 'POST',
url: '/resources/messages',
data: message // your original form data,
transformRequest: formDataObject // this sends your data to the formDataObject provider that we are defining below.
headers: {'Content-Type': 'multipart/form-data'}
}).
success(function(data, status, headers, config){
deferred.resolve(data);
}).
error(function(data, status, headers, config){
deferred.reject(status);
});
return deferred.promise;
};
Create a factory that will incorporate manipulate the form data into a sendable payload. It will iterate through your form data (including uploaded file) and return a sender-friendly object:
app.factory('formDataObject', function() {
return function(data) {
var fd = new FormData();
angular.forEach(data, function(value, key) {
fd.append(key, value);
});
return fd;
};
});
I haven't tested this, but it should work out of the box.