javascript - Angular directive not applied on change of the value -


i have directive like

testapp.directive('changevalue', function(){     alert("coming");     return {         restrict: 'e',         link: function (scope, element, attrs) {             element.text(attrs.val);         },         replace: true     }; });

and have views follows

<change-value val="{{test.val}}"/>

when refresh page, see values , alerts. when value changed don't applied directive binds view see being changed outside when called like

<span>{{test.val}}</span>

i not sure how works. in advance!

in code, link function executed once value updated when directive instance created. since want have watch of value , keep updating text can use $observe()

var app = angular.module('my-app', [], function() {})    app.controller('appcontroller', function($scope) {    $scope.test = {      val: "welcome"    };  });    app.directive('changevalue', function() {    return {      restrict: 'e',      link: function(scope, element, attrs) {        attrs.$observe('val', function() {          element.text(attrs.val);        })      },      replace: true    };  });
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>  <div ng-app="my-app" ng-controller="appcontroller">    <change-value val="{{test.val}}"></change-value>    <input ng-model="test.val" />  </div>


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