TypeError：無法讀取null的屬性“0”

Question

我正在研究一個使用Sails.js作為框架的NodeJS項目。

我想要完成的是一個權限系統，其中每個組的權限由Check Boxes設置，我使用的是AngularJS的典型表單。

當我單擊“Sumbit”按鈕時，它會在瀏覽器的控制台上拋出此錯誤：

angular.1.3.js:11594 TypeError: Cannot read property '0' of null
at $parseFunctionCall (angular.1.3.js:12333)
at callback (angular.1.3.js:22949)
at Scope.$eval (angular.1.3.js:14383)
at Scope.$apply (angular.1.3.js:14482)
at HTMLFormElement.<anonymous> (angular.1.3.js:22954)
at HTMLFormElement.eventHandler (angular.1.3.js:3011)(anonymous function) @ angular.1.3.js:11594

任何有關這方面的幫助將不勝感激。

編輯忘記了代碼：
這是接收從表單發布的信息的代碼

createGroup: function(req, res) {
Groups.create({
  groupName: req.param('groupName'),
  canViewUsers: req.param('canViewUsers'),
  canEditUsers: req.param('canEditUsers'),
  canPromoteToStaff: req.param('canPromoteToStaff'),
  canViewNotes: req.param('canViewNotes'),
  canEditPermissions: req.param('canEditPermissions')
});

以下是捕獲信息並將其POST到create函數的代碼

angular.module('GroupsModule').controller('GroupsController', ['$scope', '$http', 'toastr', function($scope, $http, toastr) {

$scope.createGroup = {
    loading: false
  };

$scope.createGroupForm = function(){

// Set the loading state (i.e. show loading spinner)
$scope.createGroup.loading = true;


// Submit request to Sails.
$http.post('/createGroup', {
  groupName: $scope.createGroupForm.groupName,
  canViewUsers: $scope.createGroupForm.canViewUsers,
  canEditUsers: $scope.createGroupForm.canEditUsers,
  canPromoteToStaff: $scope.createGroupForm.canPromoteToStaff,
  canViewNotes: $scope.createGroupForm.canViewNotes,
  canEditPermissions: $scope.createGroupForm.canEditPermissions
})
  .then(function onSuccess(sailsResponse){
    window.location = '/groups';
  })
  .catch(function onError(sailsResponse){

    // Handle known error type(s).
    // If using sails-disk adpater -- Handle Duplicate Key
    var groupAlreadyExists = sailsResponse.status == 409;

    if (groupAlreadyExists) {
      toastr.error('That group already exists', 'Error');
    }

  })
  .finally(function eitherWay(){
    $scope.createGroup.loading = false;
  })

有結束括號，但它們沒有在帖子中正確格式化。

最后這里是Form本身的代碼：

<!--STYLES-->
<link rel="stylesheet" href="/styles/angular-toastr.css">
<link rel="stylesheet" href="/styles/bootstrap.3.1.1.css">
<link rel="stylesheet" href="/styles/importer.css">
<link rel="stylesheet" href="/styles/style.css">
<link rel="stylesheet" href="/styles/theme.css">
<link rel="stylesheet" href="/styles/theme.min.css">
<!--STYLES END-->
<body ng-app="DashboardModule" ng-controller="DashboardController" ng-cloak>
<div class="bs-docs-section clearfix">
  <div class="row">
    <div class="bs-component">
      <nav class="navbar navbar-default">
        <div class="container-fluid">
          <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
              <span class="sr-only">Toggle navigation</span>
              <span class="icon-bar"></span>
              <span class="icon-bar"></span>
              <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="/">Insomnia eSports</a>
          </div>

          <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav">
              <li><a href="/groups"><i class="fa fa-users" aria-hidden="true"></i> Group Management </a></li>
            </ul>

            <!--
            <form class="navbar-form navbar-left" role="search">
              <div class="form-group">
                <input type="text" class="form-control" placeholder="Search">
              </div>
              <button type="submit" class="btn btn-default">Submit</button>
            </form>
            -->
            <ul class="nav navbar-nav navbar-right">
              <li><a href="/logout">Sign Out</a></li>
            </ul>
          </div>
        </div>
      </nav>
    </div>
  </div>
</div>

<form ng-submit="createGroupForm()" id="create-group-form" class="form-signin" name="createGroupForm">
  <h2 class="form-signin-heading">Create an account</h2>
  <div class="row">

    <!-- Group Name -->
      <label>Group Name</label>
      <input type="text" class="form-control" placeholder="Group Name" name="groupName" ng-model="createGroupForm.name" ng-maxlength="25" required>

    </div>

    <!-- Can View Users -->
      <label>View Users?</label>
      <input type="checkbox" name="canViewUsers" ng-model="canViewUsers.value">

    <!-- Can View Users -->
      <label>Edit Users?</label>
      <input type="checkbox" name="canEditUsers" ng-model="canEditUsers.value">

    <!-- Can Promote To Staff -->
      <label>Promote to Staff?</label>
      <input type="checkbox" name="canPromoteToStaff" ng-model="canPromoteToStaff.value">


    <!-- Can Promote To Staff -->
      <label>Can view notes?</label>
      <input type="checkbox" name="canViewNotes" ng-model="canViewNotes.value">

    <!-- Can Promote To Staff -->
      <label>Can edit permissions?</label>
      <input type="checkbox" name="canEditPermissions" ng-model="canEditPermissions.value">

  <br/>

  <!-- Disable signup button until the form has no errors -->
  <button class="btn btn-success btn-lg btn-block" type="submit" ng-disabled="createGroupForm.$invalid">
    <span ng-show="!createGroupForm.loading">Create Group</span>
    <span class="overlord-loading-spinner fa fa-spinner" ng-show="createGroupForm.loading" ></span>
    <span ng-show="createGroupForm.loading">Preparing your new group...</span>
  </button>

  <input type="hidden" name="_csrf" value="<%= _csrf %>" />
</form>
<!--SCRIPTS-->
<script src="/js/dependencies/sails.io.js"></script>
<script src="/js/dependencies/angular.1.3.js"></script>
<script src="/js/dependencies/Base64.js"></script>
<script src="/js/dependencies/angular-toastr.js"></script>
<script src="/js/dependencies/compareTo.module.js"></script>
<script src="/js/public/signup/SignupModule.js"></script>
<script src="/js/public/groups/GroupsModule.js"></script>
<script src="/js/private/dashboard/DashboardModule.js"></script>
<script src="/js/public/homepage/HomepageModule.js"></script>
<script src="/js/private/dashboard/DashboardController.js"></script>
<script src="/js/public/groups/GroupsController.js"></script>
<script src="/js/public/homepage/HomepageController.js"></script>
<script src="/js/public/signup/SignupController.js"></script>
<!--SCRIPTS END-->
</body>

Answer 1

我在createGroupForm上使用$ scope而不僅僅是createGroup錯誤地解決了這個問題。 更正后的代碼位如下：

代替：

$scope.createGroupForm.canViewUsers

采用：

$scope.createGroup.canViewUsers

TypeError：無法讀取null的屬性“0”

問題描述

1 個解決方案

解決方案1
0 已采納 2016-11-03 05:55:44

TypeError：無法讀取null的屬性“0”

問題描述

1 個解決方案

解決方案1 0 已采納 2016-11-03 05:55:44

解決方案1
0 已采納 2016-11-03 05:55:44