Angular.js“控制器作为......"+ $scope.$on [英] Angular.js "Controller as ..." + $scope.$on

问题描述

如果我想在 Angular 中使用Controller as ..."语法，我应该如何处理像 $scope.$on(...) 这样我需要放入控制器的东西?

我有一种印象，我可以用下面所示的其他方式来做到这一点.在这里，为了让 $scope.$ 工作，我将this"绑定到回调函数.我试图在控制器内部的this"上调用 $on ，但没有用.

你能在这里给我一个提示，或者如果我完全搞砸了，你能指出一些正确的方法吗?谢谢.

main.js:

angular.module('ramaApp').controller('MainCtrl', ['$scope', '$location', function ($scope, $location) {this.whereAmINow = 'INDEX';$scope.$on('$locationChangeStart', function(event) {this.whereAmINow = $location.path();}.bind(this));this.jumpTo = function(where) { $location.path(where);}}]);

index.html:

<p>我看到的幻灯片名为:{{ main.whereAmINow }}</p><div ng-click="main.jumpTo('/slide1')">幻灯片 1</div><div ng-click="main.jumpTo('/slide2')">幻灯片 2</div><div ng-click="main.jumpTo('/slide3')">幻灯片 3</div>

解决方案

据我所知，如果你想要 $scope 观察者/方法，你需要注入 $scope.ControllerAs 只是一种语法糖，可以让您更清楚地看到嵌套控制器的结构.

三个想法可以简化您的代码.

1. 使用var vm = this，为了摆脱bind(this).

   var vm = this;vm.whereAmINow = "/";$scope.$on('$locationChangeStart', function(event) {vm.whereAmINow = $location.path();});vm.jumpTo = 函数(其中){$location.path(where);}

2. 整个 whereamINow 变量将其放入应用程序 aka .run() 的初始化(在配置之前)是有意义的，因为我认为它是一个全局变量，您不需要使用 $scope 观察者/方法

3. 另一种选择是使用工厂来使更改保持不变，因此您只需创建一个包含当前活动路径的位置工厂.

If i'd like to use the "Controller as ..." syntax in Angular, how should I approach things like $scope.$on(...) that i need to put inside the controller?

I get an impression i could do it some other way than the one shown below. Here, to get $scope.$on working i bind "this" to the callback function. I tried to invoke $on on "this" inside the controller but it didn't work.

Could you give me a hint here or if i'm completely messing up, could you point me to some right way to do it? Thanks.

main.js:

angular.module('ramaApp')
.controller('MainCtrl', ['$scope', '$location', function ($scope, $location) {

    this.whereAmINow = 'INDEX';

    $scope.$on('$locationChangeStart', function(event) {

        this.whereAmINow = $location.path();

    }.bind(this));

    this.jumpTo = function(where) { $location.path(where); }
}]);

index.html:

<div ng-controller="MainCtrl as main">

    <p>I am seeing the slide named: {{ main.whereAmINow }}</p>

    <div ng-click="main.jumpTo('/slide1')">Slide 1</div>
    <div ng-click="main.jumpTo('/slide2')">Slide 2</div>
    <div ng-click="main.jumpTo('/slide3')">Slide 3</div>

</div>

解决方案

As far as I know, you need to inject $scope if you want $scope watchers/methods. ControllerAs is just syntactic sugar to enable to see more clearly the structure of your nested controllers.

Three ideas though which may simplify your code.

1. Use var vm = this, in order to get rid of the bind(this).

   var vm = this;
   vm.whereAmINow = "/";
   
   $scope.$on('$locationChangeStart', function(event) {
       vm.whereAmINow = $location.path();
   });
   
   vm.jumpTo = function(where) {
       $location.path(where);
   }
   

2. The whole whereamINow variable makes sense putting it into the initialization of app aka .run() (before config) since I assume it's a global variable and you don't need to use a $scope watcher/method for it.

3. Another option is to use a factory to make the changes persist, so you simply create a location factory which holds the current active path.

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