为什么ngModel的$呈现不叫当AngularJS模型的变化? [英] Why ngModel's $render is not called when the model changes in AngularJS?

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本文介绍了为什么ngModel的$呈现不叫当AngularJS模型的变化?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

DEMO

为什么在下面的例子 $渲染单击该按钮时不叫?

<输入类型=文本NG模型=client.phoneNumber电话号码>
<按钮NG点击=client.phoneNumber ='1111111111'>更改电话号码和LT; /按钮>

.directive(phoneNumber的功能(){
  返回{
    限制:'A',
    要求:'ngModel',
    链接:功能(范围,元素,ATTRS,ngModel){
      ngModel。$ =渲染功能(){
        警报('渲染'); //这不叫
      };
    }
  };
});


解决方案

输入指令的指令之后运行,因此它的 $呈现功能取代你的。

您指令的优先级为大于0的值,例如:

  .directive(phoneNumber的功能(){
  返回{
    限制:'A',
    要求:'ngModel',
    优先权:1,
    链接:功能(范围,元素,ATTRS,ngModel){
      ngModel。$ =渲染功能(){
        警报('渲染');
      };
    }
  };
});

和您的 $渲染将采取precedence,你会看到你的警惕之称。

DEMO

Why in the following example $render is not called when the button is clicked?

<input type="text" ng-model="client.phoneNumber" phone-number>
<button ng-click="client.phoneNumber='1111111111'">Change phone number</button>

.directive("phoneNumber", function() {
  return {
    restrict: 'A',
    require: 'ngModel',
    link: function(scope, element, attrs, ngModel) {
      ngModel.$render = function() {
        alert('rendering');   // This is not called
      };
    } 
  };
}); 

解决方案

The input directive is running after your directive and thus it's $render function is replacing yours.

Set your directive's priority to something greater than 0. For instance:

.directive("phoneNumber", function() {
  return {
    restrict: 'A',
    require: 'ngModel',
    priority: 1,
    link: function(scope, element, attrs, ngModel) {
      ngModel.$render = function() {
        alert('rendering');
      };
    } 
  };
});

And your $render will take precedence and you'll see your alert is called.

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