如何向组件添加ng-model功能 [英] How to add ng-model functionality to a component

问题描述

基本上，我希望能够将ng-model从父指令传递给子指令指示。我只能使用2向绑定值，但是那样我将无法在child元素的parent指令中使用ng-change。我也可以使用ng-click，但这不适用于非单击式更改（例如，文本区域而不是复选框）。因此，我想知道是否存在一种允许自定义指令具有ng-model / ng-change对的方式，类似于输入，按钮，文本区域和其他html元素的方式。我想避免使用emit，on，watch，传递回调等。我只想能够对自定义指令执行[input type = checkbox ng-model = ngModel]而不是输入。

Basically, I want to be able to pass in ng-model from a parent directive to a child directive. I could just in a 2-way binded value, but then I wouldn't be able to use a ng-change in the parent directive on the child element. I could also use ng-click, but this wouldn't work with a non-clicking change (such as a text area instead of a checkbox). So I'm wondering if there's a way to allow a custom directives to have a ng-model/ng-change pair similar to how inputs, buttons, text areas and other html elements can. I want to avoid using emits, ons, watches, passing callbacks, etc. I just want to be able to do [input type="checkbox" ng-model="ngModel"] on a custom directive instead of input.

父模板

<child ng-model="x" ng-change="x()"></toggle>

父母指令

$scope.x = function() {console.log('hi')};

子模板

<div>
     <input type="checkbox" ng-model="ngModel">
</div>

儿童指令

$scope.ngModel = $element.controller('ngModel'); 

我的角度版本为1.4.8 btw。

My angular version is 1.4.8 btw.

谢谢：）

推荐答案

与@georgeawg答案几乎相同，但使用指令方法（由于 component 是在1.5+版本中引入的，但作者的版本为1.4。 8）：

Almost the same as @georgeawg answer, but using directive method (since component was introduced in 1.5+, but author has 1.4.8):

angular.module('myApp', [])
.controller('MyCtrl', ['$scope', function MyCtrl($scope) {

}])
.directive('inputComponent', [function () {
        var myDirective = {
            restrict: 'E',
            require: 'ngModel',
            templateUrl: "checkboxComponent.html",
            link : function(scope, element, attrs, ngModelCtrl){
                scope.updateModel = function(ngModel) {
                    ngModelCtrl.$setViewValue(ngModel);
                }
            }
        }
        return myDirective;
}]);

fieldset {
  margin-top: 1em;
}

<script src="//code.angularjs.org/1.4.8/angular.js"></script>

<div ng-app="myApp">
  <div ng-controller="MyCtrl">
    
    <input-component ng-model="value"
                     ng-change="value2=value"></input-component>
                     
                                        
    <fieldset>
      <p>value = {{value}}</p>
      <p>value2 = {{value2}}</p>
    </fieldset>
    
  </div>
  
  <script type="text/ng-template" id="checkboxComponent.html">
    <div>
         <input type="text" ng-model="ngModel" ng-change="updateModel(ngModel)" />
    </div>
  </script>
  
</div>

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