javascript - Binding dynamic checkbox in angular.js -

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i have list of options pulled database via json based on product selection in angular.js

here's sample code:

<ion-checkbox ng-repeat="extra in extras" ng-model="order.extras" checklist-value="{{ extra.id }}"><strong>{{ extra.name }}</strong></ion-checkbox>

i want user able select multiple extras can't seem able bind these selections.

i think work ng-model="order.extras[extra.id]" can track checked extras in order.extras.

please have @ demo below or @ jsfiddle.

angular.module('demoapp', ['ionic'])  	.controller('maincontroller', maincontroller);        function maincontroller($scope) {  	$scope.order = {};  	$scope.extras = [      	{          id: 0,          name: 'first'          },          {          id: 1,          name: 'second'          },          {          id: 2,          name: 'third'          }      ]  }
<link href="https://cdnjs.cloudflare.com/ajax/libs/ionic/1.2.4/css/ionic.min.css" rel="stylesheet"/>  <script src="https://cdnjs.cloudflare.com/ajax/libs/ionic/1.2.4/js/ionic-angular.js"></script>  <script src="https://cdnjs.cloudflare.com/ajax/libs/ionic/1.2.4/js/ionic.bundle.js"></script>  <div ng-app="demoapp" ng-controller="maincontroller">  <ion-content>      <ion-checkbox ng-repeat="extra in extras" ng-model="order.extras[extra.id]" checklist-value="{{ extra.id }}"><strong>{{ extra.name }}</strong></ion-checkbox>        current order: {{order}}        </ion-content>  </div>


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