AngularJS - 用作单选按钮的 3 按钮组

Using the Ionic framework, I'm trying to create a group of three buttons that act as radio buttons:

If I click on Breakfast, I would like Lunch and Dinner to return to their normal (white) state, and Breakfast to turn Blue.

With my current code, I can't get this functionality to work, although I can get the buttons to switch color, slightly randomly (perhaps I just don't understand the ng-class directive).

Here is my HTML code:

<div class="bar bar-subheader">
 <div class="button-bar">
   <a class="button" ng-class="{'button-positive' : !isActiveB, 'none': isActiveB}" ng-click="active('breakfast')">Breakfast</a>
   <a class="button" ng-class="{'button-positive' : !isActiveL, 'none': isActiveL}" ng-click="active('lunch')">Lunch</a>
   <a class="button" ng-class="{'button-positive' : !isActiveD, 'none': isActiveD}" ng-click="active('dinner')">Dinner</a>
 </div>
</div>

My JS:

$scope.active = function(meal) {

 switch (meal) {
   case 'breakfast':
     $scope.$broadcast('slideBox.setSlide', 0);
     $scope.isActiveB = $scope.isActiveB;
     $scope.isActiveL = !$scope.isActiveL;
     $scope.isActiveD = !$scope.isActiveD;
     break;
   case 'lunch':
     $scope.$broadcast('slideBox.setSlide', 1);
     $scope.isActiveB = !$scope.isActiveB;
     $scope.isActiveL = $scope.isActiveL;
     $scope.isActiveD = !$scope.isActiveD;
     break;
   case 'dinner':
     $scope.$broadcast('slideBox.setSlide', 2);
     $scope.isActiveB = !$scope.isActiveB;
     $scope.isActiveL = !$scope.isActiveL;
     $scope.isActiveD = $scope.isActiveD;
     break;
 }
};

I can put the code in JSFidle if you require more information and a working solution.

Thanks for your help.

---

NOTE: I would like to maintain my active() function, and use the ng-class directive if possible, as I have a lot of other code dependent on this function.

解决方案

Maybe this simplified example will help you a little:

angular.module('plunker', []).controller('MainCtrl', function($scope) {
    $scope.active = 'breakfast';
    $scope.setActive = function(type) {
        $scope.active = type;
    };
    $scope.isActive = function(type) {
        return type === $scope.active;
    };
});

<link rel="stylesheet" href="http://code.ionicframework.com/0.9.26/css/ionic.min.css">
<script src="http://code.angularjs.org/1.2.13/angular.js"></script>

<div ng-app="plunker" ng-controller="MainCtrl" class="bar bar-subheader">
    <div class="button-bar">
        <a class="button" ng-class="{'button-positive': isActive('breakfast')}" ng-click="setActive('breakfast')">Breakfast</a>
        <a class="button" ng-class="{'button-positive': isActive('lunch')}" ng-click="setActive('lunch')">Lunch</a>
        <a class="button" ng-class="{'button-positive': isActive('dinner')}" ng-click="setActive('dinner')">Dinner</a>
    </div>
</div>

Demo: http://plnkr.co/edit/9HmuTStz70x5KoAvLaP4?p=preview