Angular Directive: Binding to a Variable in the Parent Area

Question

Angular:

jsfiddle

<div ng-app="myApp"> <script> function Contrl($scope){ $scope.parval = 0; $scope.items = [ {id: 1, text: '1'}, {id: 2, text: '2'}, {id: 3, text: '3'} ]; } </script> <div ng-controller="Contrl"> A: <input type="radio" value="1" ng-model="parval">1</input> <input type="radio" value="2" ng-model="parval">2</input> <input type="radio" value="3" ng-model="parval">3</input> <item parval="parval" items="items"></item> </div> 

 angular.module('myApp', []) .directive('item', function() { return { restrict: 'E', replace: true, scope: { parval: '=', items: '=' }, template: '<div>' + 'B: <span ng-repeat="i in items">' + '<input value="{{i.id}}" type="radio" ng-model="parval">{{i.text}}</input>&nbsp;' + '</span>' + '</div>' }; }); 

Now:
Choose A1 → B1, selected

Choose A2 → B2


Press B1 → A1 not changed
Press B2 → A2 not changed

I want to:
Choose A1 → B1, selected

Choose A2 → B2


Choose B1 → A1.
Choose B2 → A2, selected

How?

Answer 1

You are using a primitive that should be avoided instead of using a literal, because ng-repeat creates a new scope. The code below will solve your problem.

 <div ng-controller="Contrl"> A: <input type="radio" value="1" ng-model="parval.value">1</input> <input type="radio" value="2" ng-model="parval.value">2</input> <input type="radio" value="3" ng-model="parval.value">3</input> <item parval="parval" items="items"></item> </div> <script> function Contrl($scope) { $scope.parval = { value: 0 }; $scope.items = [ { id: 1, text: '1' }, { id: 2, text: '2' }, { id: 3, text: '3' } ]; } angular.module('myApp', []) .directive('item', function () { return { restrict: 'E', replace: true, scope: { parval: '=', items: '=' }, template: '<div>' + 'B: <span ng-repeat="i in items">' + '<input value="{{i.id}}" type="radio" ng-model="parval.value">{{i.text}}</input>&nbsp;' + '</span>' + '</div>' }; }); </script> 

Answer 2

One way is to use $ parent (ng-model = "$ parent.parval")

 angular.module('myApp', []) .directive('item', function() { return { restrict: 'E', replace: true, template: '<div>' + 'B: <span ng-repeat="i in items">' + '<input value="{{i.id}}" type="radio" ng-model="$parent.parval">{{i.text}}</input>&nbsp;' + '</span>' + '</div>' }; });