javascript - scope change doesn't execute code in directive -

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here directive looks like

//noinspection jscheckfunctionsignatures angular.module('notificationdirective', []).directive('notification', function ($timeout) {     //noinspection jsunusedlocalsymbols     return {         restrict: 'e',         replace: true,         scope: {             ngmodel: '@'         },         template: '<div class="alert fade" bs-alert="ngmodel"></div>',         link: function (scope, element, attrs) {             scope.$watch('message', function () {                 console.log('message now: ' + json.stringify(scope.message)); //                element.show(); //                //noinspection jsunresolvedfunction //                $timeout(function () { //                    //element.empty(); //                    element.fadeout("slow"); //                }, 2000);             });         }     } });

here controller

function notificationcontroller($scope) {     $scope.message = {};     console.log('notification activated');      $scope.invite = function() {         console.log("submitting invite " + $scope.email);         $scope.message.title = 'hello'; //        console.log('message ' + json.stringify($scope.message, null, 2));     } }

here how use it

<form class="pure-form" data-ng-controller="notificationcontroller">     <input type="text" class="pure-input-1-2" placeholder="email"            data-ng-model="email">     <button type="submit"             class="pure-button notice pure-button-xlarge"             data-ng-click="invite()">invite me     </button> </form> <notification data-ng-model="message"></notification>

what want
- whenever value if scope.message changes in notificationcontroller, directive has new value can alert on web page

what not understand
seems not understanding how $scope.$watch working

please help

you made several mistakes :

  1. your notification tag must inside controller (in html) since must have access 'message' variable.
  2. your binding in directive wrong : must use '=' instead of '@' (as thalis said).
  3. variable 'message' not exist in directive, must use scope.ngmodel (which binded message variable).
  4. callback given in watcher executed each time variable updated. since use object, watcher executed when variable reference change. must set 'true' third parameter of watcher check object equality).

here sample :

html :

<body>     <div id="my-app" data-ng-app="myapp">         <form class="pure-form" data-ng-controller="notificationcontroller">             <input type="text" class="pure-input-1-2" placeholder="email" data-ng-model="email" />             <button type="submit"               class="pure-button notice pure-button-xlarge"               data-ng-click="invite()">invite me             </button>             <notification data-ng-model="message"></notification>         </form>             </div> </body>

javascript :

var myapp = angular.module('myapp', []);  myapp.directive('notification', function() {     return {         restrict: 'e',         replace: true,         scope: {             ngmodel: '='         },         template: '<div class="alert fade" bs-alert="ngmodel"></div>',         link: function (scope, element, attrs) {             scope.$watch('ngmodel', function () {                 console.log('message now: ' + json.stringify(scope.ngmodel)); //                element.show(); //                //noinspection jsunresolvedfunction //                $timeout(function () { //                    //element.empty(); //                    element.fadeout("slow"); //                }, 2000);             }, true);         }     } });  myapp.controller('notificationcontroller', ['$scope', function($scope) {     $scope.message = {};     console.log('notification activated');      $scope.invite = function() {         console.log("submitting invite " + $scope.email);         $scope.message.title = 'hello'; //      console.log('message ' + json.stringify($scope.message, null, 2));     }; }]);

see fiddle : http://jsfiddle.net/77uca/15/


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