ng-class if object exists angularjs

How can we activate class if object exists. i have a json array where i need to activate a class if image_id exists for that particular array.

something like ng-if="data.image_id"  then class get activated

 <div class="test" ng-class="classonimage:data.image_id">
   //showing data

<div>

Here class test is active but classonimage would be activated to modify few css attributes if image_id exists.

So here i want to make some change to story if it contains image. How can we activate ng-class on ng-if. How can we achieve this?

Solution

Try:

<div class="test" ng-class="{'classonimage':data.image_id}"><div>

It's important to place class name between ' ', because if class name contains - ng-class will not work.