javascript - 如何在 AngularJS 中上传多部分表单？

Question

表单 View :

        <form enctype="multipart/form-data" ng-submit="upload(file)">

            <input type="file" ng-model="modal.file" accept="image/gif" app-filereader /><br />

            <br>

            <textarea name="description" placeholder="Description" ng-model="description" id="" cols="30" rows="10"></textarea>

            <br>

            <input type="hidden" name="user" ng-model="user" value="{{ user }}" />

            <br>

            <input type="submit" value="Submit" class="network-sensitive button button-block button" />

        </form>

指令:

.directive('appFilereader', function(
$q
){
    var slice = Array.prototype.slice;

return {
    restrict: 'A'
    , require: '?ngModel'
    , link: function(scope, element, attrs, ngModel){
        if(!ngModel) return;

        ngModel.$render = function(){}

        element.bind('change', function(e){
            var element = e.target;

            $q.all(slice.call(element.files, 0).map(readFile))
            .then(function(values){
                if(element.multiple) ngModel.$setViewValue(values);
                else ngModel.$setViewValue(values.length ? values[0] : null);
            });

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

                var reader = new FileReader()
                reader.onload = function(e){
                    deferred.resolve(e.target.result);
                }
                reader.onerror = function(e) {
                    deferred.reject(e);
                }
                reader.readAsDataURL(file);

                return deferred.promise;
            }

        });

    }

};

});

我的服务中的上传功能:

upload: function(file) {
  var token = $window.sessionStorage.token;

  var url = 'http://url.co/api/posts/creates';

  var $cache = $cacheFactory.get('$http');

  var deffered = $q.defer();

  var data = $cache.get(url);

  if(!data) {
      $http({
        url: url, 
        method: "POST",
        params: { access_token: token },
        data: file,
        headers: {'Content-Type': undefined },
        transformRequest: angular.identity
      }).then(function(res) {
      deffered.resolve(res);
    });
  } else {
    deffered.resolve(data);
  }

  return deffered.promise;
  }

我没有包含 Controller 代码，因为它只是将表单数据从模态中继到服务并且该部分正在工作。

我遇到的问题是文件是作为编码数据提交的(我对二进制数据和 blob 等的知识有点不稳定)。我的 API(用 Symfony2 编写)期待正常的文件提交，而不是数据字符串。

那么我如何将那个二进制 blob 转换成我可以提交的图像文件呢？或者我错过了什么？

Answer 1

使用这个模块 https://github.com/danialfarid/angular-file-upload 使用起来非常简单。

例如:

    var $file;//single file 
    $scope.sendFiles= function(){
     $upload.upload({
                        url: yourUrl,
                        method: "POST",
                        data: { data: $scope.yourOtherObject },
                        file: $file
                    }).success(function (data, status, headers, config) {
                        // file is uploaded successfully
                        console.log(data);
                        console.log("File upload SUCCESS");
                    }).error(function (data, status) {
                       console.log("File upload FAILED");
                    });
    } 

    $scope.onFileSelect = function ($files) {
                for (var i = 0; i < $files.length; i++) {
                    $file = $files[i];//set a single file
                }
           };

HTML代码

<input type="file" name="myfile" ng-file-select="onFileSelect($files)" />
<button ng-click='sendFiles()'>Send file</button>