AngularJS ng-class Directive Last Updated : 01 Aug, 2022 Comments Improve Suggest changes Like Article Like Report The ng-class Directive in AngularJS is used to specify the CSS classes on HTML elements. It is used to dynamically bind classes on an HTML element. The value for the ng-class has either string, an object, or an array. It must contain more than one class name, which is separated by space, in the case of a string. If it is an object, it will contain the key-value pairs, where the key represents the class name for the class that wants to add & value represent the boolean value. If the expression inside the ng-class directive returns true then only the class is added else it is not added. If the value of ng-class is an array then it can be the combination of both strings as well as an array. It is supported by all HTML elements. Syntax: <element ng-class="expression"> Contents... </element>Example 1: This example uses the ng-class Directive to set and reset the CSS class. HTML <!DOCTYPE html> <html> <head> <title>ng-class Directive</title> <script src= "https://ajax.googleapis.com/ajax/libs/angularjs/1.4.2/angular.min.js"> </script> <style> .edit { color: green; font-size: 1.5em; } </style> </head> <body ng-app="" style="text-align:center"> <h1 style="color:green;"> GeeksforGeeks </h1> <h3>ng-class Directive</h3> <div> <input type="button" ng-click="edit=true" value="Style" /> <input type="button" ng-click="edit=false" value="Reset" /> <br><br> <span ng-class="{true:'edit'}[edit]"> GeeksforGeeks </span> is the computer science portal for geeks. </div> </body> </html> Output: Example 2: This example uses the ng-class Directive to set the CSS style to the class. HTML <!DOCTYPE html> <html> <head> <title>ng-class Directive</title> <script src= "https://ajax.googleapis.com/ajax/libs/angularjs/1.4.2/angular.min.js"> </script> <style type="text/css"> .index { color: white; background-color: green; } </style> </head> <body ng-app="app" style="padding:20px"> <h1 style="color:green;"> GeeksforGeeks </h1> <h3>ng-class Directive</h3> <div ng-controller="geek"> <table> <thead> <th>Select any sorting technique:</th> <tr ng-repeat="i in sort"> <td ng-class="{index:$index==row}" ng-click="sel($index)"> {{i.name}} </td> </tr> </thead> </table> </div> <script> var app = angular.module("app", []); app.controller('geek', ['$scope', function($scope) { $scope.sort = [{ name: "Merge sort" }, { name: "Quick sort" }, { name: "Bubble sort" }]; $scope.sel = function(index) { $scope.row = index; }; }]); </script> </body> </html> Output: Comment More infoAdvertise with us Next Article Introduction to AngularJS V Vishal Chaudhary 2 Follow Improve Article Tags : Web Technologies AngularJS AngularJS-Directives Similar Reads AngularJS BasicsAngularJS TutorialAngularJS is a free and open-source JavaScript framework that helps developers build modern web applications. 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