fileupload in angularjs produces an error - angularjs

Question

I'm trying to use a simple file upload using angularjs, but the Upload and Close buttons are not working.
Here is my html:
<div>
<div class="modal-header">
<h3 class="modal-title">File Attachment</h3>
</div>
<div class="modal-body">
<input type="file" file-model="myFile" />
</div>
<div class="modal-footer">
<div class="btn-toolbar pull-right" role="toolbar">
<div class="btn-group" role="group" ng-controller="FileUploadController as fileUploadCtrl">
<button class="btn btn-default" ng-click="FileUploadCtrl.uploadFile()">Upload</button>
</div>
<div class="btn-group" role="group">
<button type="button" class="btn btn-default" ng-click="$close()">Close</button>
</div>
</div>
</div>
</div>
In addition, I am getting an error in my factory even before I hit the browse button that states the following, but cannot find a solution for it on the web even though I see many questions about it.
[$injector:undef] Provider 'fileUpload' must return a value from $get factory method.
Here is my factory method:
.factory('fileUpload', ['$http', function ($http) {
this.uploadFileToUrl = function (file, uploadUrl) {
var fd = new FormData();
fd.append('file', file);
$http.post(uploadUrl, fd, {
transformRequest: angular.identity,
headers: { 'Content-Type': undefined }
})
.success(function () {
})
.error(function () {
});
}
}])
Here is my directive:
.directive('fileModel', ['$parse', function ($parse) {
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]);
});
});
}
};
}])
Here is my js file function:
module.controller('FileUploadController', ['$scope', 'fileUpload', function ($scope, fileUpload)
{
$scope.uploadFile = function ()
{
var file = $scope.myFile;
console.log('file is ');
console.dir(file);
var uploadUrl = "/fileUpload";
fileUpload.uploadFileToUrl(file, uploadUrl);
};
}])
Note that I need to use a factory and directive since this file attachment functionality will be used across multiple forms.
From what the error message says, it looks like I need to return a value from the factory method, but don't know what....
Can someone please tell me how I can accomplish the file uploading here and what I'm doing wrong?

Answer 1

Use factory like this
.factory('fileUpload', ['$http', function ($http) {
return
{
uploadFileToUrl : function(file, uploadUrl){
var fd = new FormData();
fd.append('file', file);
$http.post(uploadUrl, fd, {
transformRequest: angular.identity,
headers: {'Content-Type': undefined}
})
.success(function(){
})
.error(function(){
});
}
}
}]);
or if you want instead of factory you can use 'service'
.service('fileUpload', ['$http', function ($http) {
this.uploadFileToUrl = function(file, uploadUrl){
var fd = new FormData();
fd.append('file', file);
$http.post(uploadUrl, fd, {
transformRequest: angular.identity,
headers: {'Content-Type': undefined}
})
.success(function(){
})
.error(function(){
});
}
}]);
for more detail you can check this link : AngularJS: Service vs provider vs factory