How to change the class of a :after in Angularjs using ng-class?

Question

How to change the class of a :after in Angularjs using ng-class?

Asked 9 years, 4 months ago

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3

I have a div with an after and would like to change the background color of that after dynamically via controller, however I am not succeeding in importing ng-class in parent div.

<div class="infos" ng-class="myController.infoBlue">
   My Infos.
   :after
</div>

Note: I have different styles in div and :after. Div has a background of one color and my after has a background of another color and I want to change only the after.

2 answers

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by Denison Luz • **271** points · Answer 1 · 2015-08-06T13:30:38+00:00

Take a look at the code below and see if it helps you.

Or see it working on http://plnkr.co/edit/zmokTDQnJsArl49ynczK?p=preview

<!doctype html>
    <html ng-app>
      <head>
        <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.5/angular.min.js"></script>
<script>
    function Ctrl($scope) {
      $scope.items = [{'color' : 'blue'}, {'color':'red'}, {'color':'green'}];
      $scope.selection = $scope.items[0];
    }
</script>

        <style>

           p.blue::after { 
            content: " - in Blue";
            background-color:blue;
            color: #fff;
          }

          p.red::after { 
            content: " - in Red";
            background-color:red;
            color: #fff;
          }

          p.green::after { 
            content: " - in Green";
            background-color:green;
            color: #fff;
          }

        </style>
      </head>
      <body>

    <div ng-controller="Ctrl">
      <p ng-class="selection.color">I love Brazil! </p>

      <select ng-model="selection" ng-options="item.color for item in items">
      </select>
      <tt>selection={{selection.color}}</tt>
    </div>
      </body>
    </html>

by celsomtrindade • **8,038** points · Answer 2 · 2015-12-12T08:58:47+00:00

The ng-class works through a condition, it needs an expression to apply or not a certain class, for example:

<div class="minhaDiv" ng-class="{'classeSecundaria': meuValor > 5}">Teste</div>

In this case the class classeSecundaria would be applied to the div if the property meuValor has a value greater than 5.

In your case just do this check and apply the desired class. Otherwise it’s just configuration css.

To change the color dynamically, you can do something like this:

.menu:after {
  background:red;
}
.menu.azul:after {
  background:blue;
}

See this example working:

http://plnkr.co/edit/M5MtkqGSqxJRZC8t2C77?p=preview