How to apply the CSS class binding in AngularJs?

The ng-class angularjs binding are used to bind the CSS classes in HTML controls with JS binding functions.

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The example as give below.

//This is CSS code sample

    .background1 {

      background-color: #eeee12;

      color: red;

    }

    .background {

      background-color: #3ab44a;

      color: white;

    }

//This is CSS code sample
    .background1 {
      background-color: #eeee12;
      color: red;
    }
    .background {
      background-color: #3ab44a;
      color: white;
    }

//This is AngularJs code sample

    var app = angular.module('ngApp', []);

    app.controller('MainController', function($scope) {

      $scope.color = {

        back: true

      };

      $scope.emp = {

        name: 'Anil Singh',

        comp: 'code-sample.com',

        age: '30 Years'

      };

    });

//This is AngularJs code sample
    var app = angular.module('ngApp', []);
    app.controller('MainController', function($scope) {
      $scope.color = {
        back: true
      };

      $scope.emp = {
        name: 'Anil Singh',
        comp: 'code-sample.com',
        age: '30 Years'
      };
    });

//This is HTML code sample

<body ng-app="ngApp" ng-controller="MainController">

  <div ng-class="{'background': color.back}">

    <label>

      <span>{{emp.name}}</span>

    </label>

  </div>

  <div ng-class="{'background1': color.back}">

    <label>

      <span>{{emp.comp}}</span>

    </label>

  </div>

  <div ng-class="{'background': color.back}">

    <label>

      <span>{{emp.age}}</span>

    </label>

  </div>

</body>

//This is HTML code sample
<body ng-app="ngApp" ng-controller="MainController">
  <div ng-class="{'background': color.back}">
    <label>
      <span>{{emp.name}}</span>
    </label>
  </div>
  <div ng-class="{'background1': color.back}">
    <label>
      <span>{{emp.comp}}</span>
    </label>
  </div>
  <div ng-class="{'background': color.back}">
    <label>
      <span>{{emp.age}}</span>
    </label>
  </div>

</body>

//Full example(CSS + HTML + JavaScript) code sample

<!doctype html>

<html>

<head>

  <meta charset="utf-8">

  <title>css binding in angularjs</title>

  <style>

    .background1 {

      background-color: #eeee12;

      color: red;

    }

    .background {

      background-color: #3ab44a;

      color: white;

    }

  </style>

  <script src="https://code.angularjs.org/1.3.9/angular.js"></script>

  <script>

    var app = angular.module('ngApp', []);

    app.controller('MainController', function($scope) {

      $scope.color = {

        back: true

      };

      $scope.emp = {

        name: 'Anil Singh',

        comp: 'code-sample.com',

        age: '30 Years'

      };

    });

  </script>

</head>

<body ng-app="ngApp" ng-controller="MainController">

  <div ng-class="{'background': color.back}">

    <label>

      <span>{{emp.name}}</span>

    </label>

  </div>

  <div ng-class="{'background1': color.back}">

    <label>

      <span>{{emp.comp}}</span>

    </label>

  </div>

  <div ng-class="{'background': color.back}">

    <label>

      <span>{{emp.age}}</span>

    </label>

  </div>

</body>

</html>

//Full example(CSS + HTML + JavaScript) code sample
<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <title>css binding in angularjs</title>
  <style>
    .background1 {
      background-color: #eeee12;
      color: red;
    }
    .background {
      background-color: #3ab44a;
      color: white;
    }
  </style>
  <script src="https://code.angularjs.org/1.3.9/angular.js"></script>
  <script>
    var app = angular.module('ngApp', []);
    app.controller('MainController', function($scope) {
      $scope.color = {
        back: true
      };

      $scope.emp = {
        name: 'Anil Singh',
        comp: 'code-sample.com',
        age: '30 Years'
      };
    });
  </script>
</head>
<body ng-app="ngApp" ng-controller="MainController">
  <div ng-class="{'background': color.back}">
    <label>
      <span>{{emp.name}}</span>
    </label>
  </div>
  <div ng-class="{'background1': color.back}">
    <label>
      <span>{{emp.comp}}</span>
    </label>
  </div>
  <div ng-class="{'background': color.back}">
    <label>
      <span>{{emp.age}}</span>
    </label>
  </div>
</body>
</html>

The Out put look like below image

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