AngularJS ng-class not applying css styles -

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i have company site developing angularjs , having troubles ng-class

here html:

<a href="timeentry.php" ng-class="{{(userrole.admin) ? '' : 'inactive'}}">     link </a>

css:

.inactive {     pointer-events : none;     cursor         : default; }

chrome inspect element:

<a href="timeentry.php" ng-class="inactive">     link </a>

obviously have tested class="inactive" , working should, chrome's view source appears showing me should working not being applied.

assuming userrole.admin boolean, should work

<a href="timeentry.php" ng-class="{ inactive: !userrole.admin }">     link </a>

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