I have a site showing a list of comments and the comments can be liked by clicking a button.
The site is written using angular and the list of comments are fetched from a node back end and rendered using
<div class="stickyNotes" ng-repeat="comment in commentList1">
<a href=""><img src="../resources/images/thumb.png" class="upvoteImage" /> </a>
You can use $index, and pass it to your controller method onClick. Then you can access the exact comment $scope.commentList1[index] on your controller, and do what you what with it.
you can learn about $index here: