从AngularJS中的父控制器调用指令的方法 [英] Calling directive's methods from parent controller in AngularJS

问题描述

我正在使用 AngularJS 与别名控制器模式。我无法从父控制器访问（或我不知道如何）指令方法。

I am using AngularJS with the alias controllers pattern. I can't access (or I don't know how to) directive methods from a parent controller.

我的控制器里面有一个函数，它应该调用一个指令方法，但是这个指令方法在这个控制器值。

I have a function inside my controller that should call a directive method but this directive method is not available inside the this controller value.

这是我所拥有的。我做错了什么？

This is what I have. What I am doing wrong?

JS

angular.module('myApp', []).

controller('MyCtrl', function(){
  this.text = 'Controller text';

  this.dirText = 'Directive text';

  this.click = function(){
    this.changeText();
  }
})

.directive('myDir', function(){
  return {
     restrict: 'E',
     scope: {
       text: '='
     },
     link: function(scope, element, attrs){
       scope.changeText = function(){
         scope.text = 'New directive text';
       };
     },
     template: '<h2>{{text}}</h2>'
  };
});

HTML

<div ng-app="myApp">
  <div ng-controller="MyCtrl as ctrl">
    <h1>{{ctrl.text}}</h1>
    <my-dir text="ctrl.dirText"></my-dir>
    <button ng-click="ctrl.click()">Change Directive Text</button>
  </div>
</div>

此处代码的代码。

推荐答案

如果您严格使用孤立的 / code>在一个指令内，那么指令方法只能通过使用角度事件（例如 $ broadcast & $ emit

If you strictly want to use isolated scope inside a directive then the directive method can be only called by using angular events such as $broadcast & $emit

在您的情况下，您需要使用 $ broadcast 将事件发送到整个 $ rootScope

In your case, you need to use $broadcast to send event to entire $rootScope

您的代码将成为这样。

工作代码笔

HTML

<div ng-app="myApp">
  <div ng-controller="MyCtrl as ctrl">
    <h1>{{ctrl.text}}</h1>
    <my-dir text="ctrl.dirText"></my-dir>
    <button ng-click="ctrl.click()">Change Directive Text</button>
  </div>
</div>

代码

angular.module('myApp', []).

controller('MyCtrl', function($rootScope){
  var that = this;

  this.text = 'Controller text';

  this.dirText = 'Directive text';

  this.click = function(){
      $rootScope.$broadcast('changeText',{});
  }
}).

directive('myDir', function(){
  return {
     restrict: 'E',
     scope: {
       text: '='
     },
     link: function(scope, element, attrs){
       scope.changeText = function(){
         scope.text = 'New directive text';
       };
         scope.$on('changeText',function(event, data){
             scope.changeText()
         });
     },
     template: '<h2>{{text}}</h2>'
  };
});

而不是调用子范围的方法，您需要广播一个事件，而且必须收听通过指令范围&在收听该事件之后，它将触发 changeText 方法。

Instead of calling method of child scope, you need to broadcast an event and that will have to be listened by the directive scope & it will fire changeText method after listening to that event.

注意

使用服务/工厂将是更好的方法。

Using service / factory would be better approach.

This would be hopefully help you. Thanks.

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