从 AngularJS 中的服务内部访问 $scope 属性

本文介绍了从 AngularJS 中的服务内部访问 $scope 属性的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

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我正在尝试在 angular 服务中创建一个构造函数，然后我可以在不同的 angular 控制器中使用它.问题是，我从构造函数生成的对象需要访问 $scope 对象上的属性之一才能正常运行.

我的实现与我所追求的功能一起工作，但它涉及将 $scope 对象作为参数传递到构造函数中.有没有更好的方法来实现这一点?我目前的实施方式有什么问题吗?

HTML:

<div ng-controller="myController"><input type="text" ng-model="hello"/><br/>{{你好}}<br/>{{helloSayer.hello}}<br/>{{helloSayer.helloLength()}}

JavaScript:

var myApp = angular.module('myApp', []);myApp.controller('myController', function myController($scope, myService) {$scope.hello = '来自控制器的你好';$scope.helloSayer = new myService.HelloSayer($scope);});myApp.factory('myService', function () {var HelloSayer = 函数(控制器作用域){this.hello = '来自服务的你好';this.helloLength = 函数 () {返回 controllerScope.hello.length;};};返回 {你好说:你好说};});

这是小提琴中的工作代码:http://jsfiddle/dBQz4/>

解决方案

你真的不想传递范围，它们是复杂的野兽.更重要的是，作为一般规则，明确说明您正在传递的内容是一个好主意.如果你只需要一杯牛奶，就不要送奶牛.

var myApp = angular.module('myApp', []);myApp.controller('myController', function myController($scope, myService) {$scope.hello = '来自控制器的你好';$scope.helloSayer = new myService.HelloSayer($scope.hello);});myApp.factory('myService', function () {var HelloSayer = 函数(controller_hello){this.hello = '来自服务的你好';this.helloLength = 函数 () {返回controller_hello.length；};};返回 {你好说:你好说};});

I am trying to create a constructor function inside an angular service, which I could then use inside of my different angular controllers. The problem is, my object generated from the constructor needs access to one of the properties on my $scope object in order to function correctly.

I have the implementation working with the functionality I am after, but it involves passing the $scope object into the constructor function as a parameter. Is there a better way to accomplish this? Are there any issues with the way I currently have it implemented?

HTML:

<div ng-app="myApp">
    <div ng-controller="myController">
        <input type="text" ng-model="hello" />
        <br/>{{hello}}
        <br/>{{helloSayer.hello}}
        <br/>{{helloSayer.helloLength()}}
    </div>
</div>

JavaScript:

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

myApp.controller('myController', function myController($scope, myService) {
    $scope.hello = 'Hello from controller';

    $scope.helloSayer = new myService.HelloSayer($scope);
});

myApp.factory('myService', function () {
    var HelloSayer = function (controllerScope) {
        this.hello = 'Hello from service';
        this.helloLength = function () {
            return controllerScope.hello.length;
        };
    };

    return {
        HelloSayer: HelloSayer
    };
});

Here is the working code in a fiddle: http://jsfiddle/dBQz4/

解决方案

You really do not want to be passing scopes around, they are complicated beasts. More to the point, as a general rule it is a good idea to be explicit about what you are passing around. Don't send the cow if you only need a glass of milk.

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

myApp.controller('myController', function myController($scope, myService) {
    $scope.hello = 'Hello from controller';

    $scope.helloSayer = new myService.HelloSayer($scope.hello);
});

myApp.factory('myService', function () {
    var HelloSayer = function (controller_hello) {
        this.hello = 'Hello from service';
        this.helloLength = function () {
            return controller_hello.length;
        };
    };

    return {
        HelloSayer: HelloSayer
    };
});

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