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<!DOCTYPE html>
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script>
  <meta charset="utf-8">
  <title>JS Bin</title>
  
</head>
<body>
<div ng-app="app" ng-controller="ctrl">
<form id="selectionForm">
    <input type="checkbox" ng-click="toggleAll()" ng-model="isAllSelected">Select all
    <br>
     <div ng-repeat = "option in options">
        <input type="checkbox" ng-model="option.selected" ng-change="optionToggled()">{{option.value}}
     </div>
</form>
  {{options}} 
</div>
</body>
</html>
 
angular.module("app", []).controller("ctrl", function($scope){
  
  $scope.options = [
    {value:'Option1', selected:true}, 
    {value:'Option2', selected:false}
  ];
  
  $scope.toggleAll = function() {
     var toggleStatus = $scope.isAllSelected;
     angular.forEach($scope.options, function(itm){ itm.selected = toggleStatus; });
   
  };
  
  $scope.optionToggled = function(){
    $scope.isAllSelected = $scope.options.every(function(itm){ return itm.selected; });
  };
});
Output

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