অ্যাঙ্গুলারজেএস ng-focus

<!DOCTYPE html>
<html lang="en" ng-app="app">
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.8.3/angular.min.js"></script>
<body ng-controller="control">

<input
  ng-focus="focused($event)"
  placeholder="এখানে ক্লিক করুন">

<script>
angular.module("app", [])
  .controller("control", function($scope) {

    $scope.focused = function(event) {
      event.target.style.background = "lightgreen";
    };

  });
</script>

</body>
</html>