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.
<!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 > |
Output:
- Date not Defined:
- If Date is defined and its value is “2019-04-07T23:46:20.586”:
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