不更新控制器型号角文件上传指令 [英] Angular File Upload directive not updating controller model

问题描述

我试图按照此 [教程] ，但可以'弄不明白的工作。

I am attempting to follow this [tutorial] but can't get it working.

我的角度控制器记录未定义在我的指令创建的模型。
这里是href=\"http://jsfiddle.net/JeJenny/ZG9re/\" rel=\"nofollow\"> [的jsfiddle] 它工作创造了我的教程的作者一个

My Angular controller is logging undefined for a model created in my directive. Here is a [JSFiddle] of it working created my author of tutorial.

问题是认为可以找到 $ scope.myFile 键，但控制器不（ $ scope.myFile 为未定义）。

The problem is the view can find $scope.myFile and but controller does not ($scope.myFile is undefined).

该视图显示 {{} myFile.name} （如刚才的例子我-image.jpg的）。在 MYFILE 变量是包含在选定的文件数据的JS对象。这工作得很好。该指令似乎被分配模型所选文件的值（因此鉴于正确​​显示的话）。

The view displays {{ myFile.name }} (as just example my-image.jpg). The myFile variable is a JS object containing data on selected file. This works fine. The directive seems to be assigning the model the value of selected file (and thus displays it correctly in view).

<input file-model="myFile" type="file"/ >
<div class="label label-info">
  {{ myFile.name }}
</div>
<button ng-click="uploadDocs()">Click</button>

下面是我从这个 [教程] 得到了指令。

Here is the directive I got from this [tutorial].

由于输入型文件不能使用 NG-模型，该指令树立典型，以关联与文件输入，每次文件大火更改事件分配给它。

Since input type file can't use ng-model, this directive sets up the model to be associated with an file input, assigning to it every time the file fires change event.

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(){
              if (element[0].files.length > 1) {
                modelSetter(scope, element[0].files);
              }
              else {
                modelSetter(scope, element[0].files[0]);
              }
            });
          });
        }
      };
    }
  ]).

在控制器我只要登录 $ scope.myFile 。这是从在上述的HTML按钮调用。
理想情况下，我会在这里的文件上传到服务器上，但我不能，因为 $ scope.myFile 是不确定的。

In the controller I just log $scope.myFile. This is called from the button in the HTML above. Ideally, I'd be uploading the files to server here, but I can't because $scope.myFile is undefined.

$scope.uploadDocs = function() {
  var file = $scope.myFile;
  console.log($scope.myFile);
};

有人能告诉我为什么认为会recieving $ scope.myFile 但是控制器日志未定义为 $ scope.myFile ？

推荐答案

我想从控制器访问指令的变量时，碰到了同样的问题。在我来说，我可以让 MYFILE 提供给控制器，但我不得不把它分配给范围。$父。$​​ parent.myFile 从指令中。为了访问变量我不想在祖先的深度硬code，所以我结束了使用一个服务共享指令和控制器之间的变量：

I ran into the same problem when trying to access a directive's variable from the controller. In my case I could make myFile available to the controller, but I had to assign it to scope.$parent.$parent.myFile from within the directive. I didn't want to hard code in a depth of ancestry in order to access the variable, so I ended up using a service to share the variable between directive and controller:

.factory('fileService', function() {
    var files = [];
    return files;
})

我的指令，code更改为使用该服务，而不是 attrs.fileModel 这是本教程中使用：

.directive('fileModel', ['$parse', 'fileService', function ($parse, fileService) {
    return {
        restrict: 'A',
        link: function(scope, element) {
            element.bind('change', function(){
                scope.$apply(function(){
                    if (element[0].files != undefined) {
                        fileService.push(element[0].files[0]);
                        console.log('directive applying with file');
                    }
                });
            });
        }
    };
}])

然后，注入的FileService到控制器后，我可以直接从的FileService访问文件：

Then, after injecting fileService into the controller I could access the file directly from fileService:

$scope.uploadDocs = function() {
    console.log(fileService);
};

这篇关于不更新控制器型号角文件上传指令的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！