javascript - 如何从 AngularJS 获取变量并在 javascript 中使用它们？

Question

我正在使用 Ionic 和 Cordova 创建一个照片编辑应用程序。我在网上读到可以获取 AngularJS 变量并在 JS 中使用它们。但我尝试了一下，控制台中出现错误: app.js:1271 未捕获类型错误:$(...).scope 不是函数

这是我的代码:

//Loading the variable from AngularJS
        window.onload = function() {
            var sources = {

                yoda: $('[ng-controller="SecureController"]').scope().pictureUrl
            };
            loadImages(sources, initStage);

        };


 //Using ngCordova to capture the image and set the image link to $scope.pictureUrl. *This part works*

$cordovaCamera.getPicture(options)
        .then(function(imageData) {
            syncArray.$add({image: imageData});
            $scope.pictureUrl= 'data:image/jpeg:base64,' + data
            .then(function() {
                alert("Image has been uploaded");
            });

Answer 1

如果您的 jQuery 资源引用位于 angualrjs 资源引用之后，Angualrjs 资源引用之后，Angular 切换到 Angular jqlite，您将收到此错误，因此 jQuery 选择器不知道 .scope()

我创建了以下三个jsfiddles来演示，示例3将在控制台中出现错误:

Example1 :没有 Jquery - 如果没有引用 jquery，则必须使用 Angular jqlite

HTML:

<div id="myDiv" ng-controller="SecureController">
  <h1>{{pictureUrl}}</h1>
</div>

JS:

var myApp = angular.module('application', []);

myApp.controller('SecureController', ['$scope', function($scope) {
  $scope.pictureUrl = 'this is a test url';
}]);

window.onload = function() {
  var sources = {
    yoda: angular.element(document.getElementById('myDiv')).scope().pictureUrl
  };
  console.log(sources.yoda);
  alert(sources.yoda);
}

Example2 :jQuery 包含在 Angular 之前 - 使用 jQuery 选择器

HTML:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.9/angular.min.js"></script>

<div id="myDiv" ng-controller="SecureController">
  <h1>{{pictureUrl}}</h1>
</div>

JS:

var myApp = angular.module('application', []);

myApp.controller('SecureController', ['$scope', function($scope) {
  $scope.pictureUrl = 'this is a test url';
}]);

window.onload = function() {  
  var sources = {
    yoda: $('#myDiv').scope().pictureUrl
  };
  console.log(sources.yoda);
  alert(sources.yoda);
}

Example3 :jQuery 包含在 angaular 之后 - 您将收到 Uncaught TypeError: $(...).scope is not a function 错误

HTML:

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.9/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js"></script>

<div id="myDiv" ng-controller="SecureController">
  <h1>{{pictureUrl}}</h1>
</div>

JS:

var myApp = angular.module('application', []);

myApp.controller('SecureController', ['$scope', function($scope) {
  $scope.pictureUrl = 'this is a test url';
}]);

window.onload = function() {  
  var sources = {
    yoda: $('#myDiv').scope().pictureUrl
  };
  console.log(sources.yoda);
  alert(sources.yoda);
}