The angular.isDefined() function in AngularJS is used to determine the value inside isDefined function is defined or not. It returns true if the reference is defined otherwise returns false.
Syntax:
angular.isDefined( value );
Parameter value:
- value: This parameter is a reference to check whether the entered value is defined or not.
Return Value: It returns true if the passed value is defined otherwise returns false.
Example: This example uses angular.isDefined() function to determine the value inside isDefined function is defined or not.
HTML
<!DOCTYPE html> <html> <head> <title>angular.isDefined()</title> <script src= "//ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"> </script> </head> <body ng-app="app" style="text-align:center"> <h1 style="color:green"> GeeksforGeeks </h1> <h3>angular.isDefined()</h3> <div ng-controller="geek"> <b>Date:</b> {{date}} <br><br> {{isDefined}} </div> <!-- Script to uses angular.isDefined() function --> <script> var app = angular.module("app", []); app.controller('geek', ['$scope', function($scope) { $scope.date; $scope.isDefined = angular.isDefined($scope.date) == true ? "$scope.date is defined." : "$scope.date is undefined."; }]); </script> </body> </html> |
Output:
- Date is not Defined:
- If Date is defined and its value is “2019-04-07T23:46:20.586”:
Example 2: This example describes the usage of angular.isDefined() Function in AngularJS by specifying the current time.
HTML
<!DOCTYPE html> <html> <head> <title>angular.isDefined()</title> <script src= "//ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"> </script> </head> <body ng-app="app" style="text-align: center"> <h1 style="color: green">GeeksforGeeks</h1> <h3>angular.isDefined()</h3> <div ng-controller="geek"> <b>Time:</b> {{ today| date : 'mediumTime'}} <br /><br /> {{isDefined}} </div> <!-- Script to uses angular.isDefined() function --> <script> var app = angular.module('app', []); app.controller('geek', ['$scope', function($scope) { $scope.today = new Date(); $scope.isDefined = angular.isDefined($scope.today) == true ? '$scope.date is defined.' : '$scope.date is undefined.'; }, ]); </script> </body> </html> |
Output:
- Time is not Defined:
- When Time is defined:
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