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: