angularjs - How to update angular ng-class when a variable changes? -

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i want ng-class update when variable in controller changes. reason, triggered on page load , whilst variable change, ng-class not update reflect this.

here code triggers variable change: 

<a class="cs-mobile-menu__close-icon" ng-click="switchmobilemenu('right')"> </a>

here code want change depending on variable:

<div class="right-menu__user"         ng-class="{                   'animate': true,                   'animate--leave': !isrightmenuopen}">   {{user.firstname}} {{user.lastname}} </div>

here corresponding code controller:

$rootscope.isleftmenuopen = false; $rootscope.isrightmenuopen = false;  $scope.switchmobilemenu = function(direction) {        if (direction === 'left') {            $scope.isleftmenuopen = !($scope.isleftmenuopen);        } else {            $scope.isrightmenuopen = !($scope.isrightmenuopen);        } };

it seems ng-class set on initial ng-click. believe need wrap above function in $scope.apply() function ng-class watches changes , applies them ng-click toggles variable. on right track? if so, how this?

you don't need $scope.$apply. working example: https://jsbin.com/fogasiniku/edit?html,js,output

do have double dashes in css class name?


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