javascript - Why overridden `controller.$render` is not getting called? -

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have @ code @ plnkr.co. in link function of directive, controller.$render() called worked fine. problem when override controller.$render function not run. console.log('overridden $render function called'); not appear in console.

script.js is:

var app = angular.module('myapp', []);  app.directive('test', function () {     return {         require: '?ngmodel',         link: function ($scope, $element, $attr, controller) {             if (!controller) {                 console.log("controller of ngmodel not found");                 return;             } else {                 console.log("controller of ngmodel found");                 controller.$setviewvalue('qwerty');                 //controller.$render();                 controller.$render = function(){                   console.log('overridden $render function called');                   }             }         }     }; });

index.html is:

<!doctype html>  <html ng-app="myapp">     <head>         <meta charset="utf-8">          <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.7/angular.min.js"></script>         <script src="script.js"></script>      </head>     <body>         <div>todo write content </div>           <input test type="text" ng-model="name" >          <h1>name: {{name}}</h1>       </body> </html>

try calling controller.$render() right after override it:

var app = angular.module('myapp', []);  app.directive('test', function () {     return {         require: '?ngmodel',         link: function ($scope, $element, $attr, controller) {             if (!controller) {                 console.log("controller of ngmodel not found");                 return;             } else {                 console.log("controller of ngmodel found");                 controller.$setviewvalue('qwerty');                 //controller.$render();                 controller.$render = function(){                   console.log('overridden $render function called');                   }                 controller.$render();             }         }     }; });

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