Send FormData with other field in AngularJS

Question

I have a form with two input text and one upload. I have to send it to the server but I have some problem concatenating the file with the text. The server expects this answer:

"title=first_input" "text=second_input" "file=my_file.pdf"

This is the html:

<input type="text" ng-model="title">
<input type="text" ng-model="text">
<input type="file" file-model="myFile"/>
<button ng-click="send()">

This is the Controller:

$scope.title = null;
$scope.text = null;

$scope.send = function(){
  var file = $scope.myFile;
  var uploadUrl = 'my_url';
  blockUI.start();
  Add.uploadFileToUrl(file, $scope.newPost.title, $scope.newPost.text, uploadUrl);
};

This is the Directive fileModel:

  return {
restrict: 'A',
link: function(scope, element, attrs) {
  var model = $parse(attrs.fileModel);
  var modelSetter = model.assign;

  element.bind('change', function(){
    scope.$apply(function(){
      modelSetter(scope, element[0].files[0]);
    });
  });
}
};

And this is the Service which call the server:

  this.uploadFileToUrl = function(file, title, text, uploadUrl){
   var fd = new FormData();
   fd.append('file', file);
   var obj = {
     title: title,
     text: text,
     file: fd
   };
   var newObj = JSON.stringify(obj);

     $http.post(uploadUrl, newObj, {
       transformRequest: angular.identity,
       headers: {'Content-Type': 'multipart/form-data'}
     })
  .success(function(){
    blockUI.stop();
  })
  .error(function(error){
    toaster.pop('error', 'Errore', error);
  });
}

If I try to send, I get Error 400, and the response is: Multipart form parse error - Invalid boundary in multipart: None. The Payload of Request is: {"title":"sadf","text":"sdfsadf","file":{}}

Answer 1

Don't serialize FormData with POSTing to server. Do this:

this.uploadFileToUrl = function(file, title, text, uploadUrl){
    var payload = new FormData();

    payload.append("title", title);
    payload.append('text', text);
    payload.append('file', file);

    return $http({
        url: uploadUrl,
        method: 'POST',
        data: payload,
        //assign content-type as undefined, the browser
        //will assign the correct boundary for us
        headers: { 'Content-Type': undefined},
        //prevents serializing payload.  don't do it.
        transformRequest: angular.identity
    });
}

Then use it:

MyService.uploadFileToUrl(file, title, text, uploadUrl).then(successCallback).catch(errorCallback);