how it not working add class using ng-repeat?

it may be click photo and not add class inside the ng-repeat using angularjs

   <div class="resultitem" ng-repeat="a in vm.gettrustalbum">
    <div class="result">
     </div>
  </div>

add class “demo” inside the ng-repeat?

output

 <div class="resultitem" ng-repeat="a in vm.gettrustalbum">
     <div class="result demo">
     </div>
  </div>

Source: AngularJS

from Angular Questions https://angularquestions.com/2017/10/04/how-it-not-working-add-class-using-ng-repeat/
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