is this possible to add active class based on click .
Fiddle
<button class="btn btn-twitter btn-left-icon" ng-class="{'active' : install}" type="button" ng-click="liveHint('install')">
نصب جدید
</button>
<button type="button" class="btn btn-twitter btn-left-icon" ng-class="{'active' :add}" ng-click="liveHint('add')">
ادغام
</button>
<button type="button" class="btn btn-twitter btn-left-icon" ng-class="{'active' :add}" ng-click="liveHint('add')">
تفکیک
</button>