AngularJS | angular.isDefined() Function

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 a defined otherwise returns false.

Syntax:

angular.isDefined( value )

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.

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<!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>
        <h2>angular.isDefined()</h2>
          
        <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>                    

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Output:

  • Date not Defined:
    isDefined
  • If Date is defined and its value is “2019-04-07T23:46:20.586”:
    isDate


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