angularjs - Two way binding in a directive that triggers a watch even after the data changes again? -


i'm writing directive lookup value list of data , display value. why when click change data button in plunkr example not change result? i've tried $watch fires once.

plunk: http://plnkr.co/edit/9a3z0kmm8eabngyv1nmh?p=preview

for example, here usage:

<lookup-binder lookup="lookuplist" find="data.id" result="lookuplist.description"></lookup-binder>

here directive looks like:

app.directive('lookupbinder', function() {   return {     restrict: 'e',     scope: {       lookup: '=',       find: '=',       result: '='     },     controller: function($scope){       console.log('controller fired');     },      link: function(scope, element, attrs, tabsctrl) {        console.log('link fired')        scope.$watch(scope.find, function(newvalue, oldvalue) {           console.log('watch fired');            var el = _.find(scope.lookup, { id: scope.find });         if(el != null){           scope.result = el.description;         }         });       },     template: 'lookup binder: <br/> lookuplist: {{lookup}} <br/> find: {{find}} <br/> result: {{result}} <br/>'   }; });

controller:

var appname = angular.module('app', []);  angular.module('app').controller('testcontroller', testcontroller);  testcontroller.$inject = ['$scope'];  function testcontroller($scope) {     $scope.gradelevels = [{         id: '1',         description: 'kindergarden'     }, {         id: '2',         description: 'first grade'     }];     $scope.gradelevel = {         gradelevelid: '1',         record: 'test1'     };     console.info('gradelevels[0].id = ' + $scope.gradelevels[0].id);     console.info('gradelevel.gradelevelid = ' + $scope.gradelevel.gradelevelid); }

scope's $watch function takes either string or function, change either 1 of them:

scope.$watch('find', function(newvalue, oldvalue) {      ... }

also, result of _.random number, , ids strings, change random string:

$scope.data.id = _.random(1,4).tostring();

check plunker


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