The angular isDefined() function is use to check the value or references in
defined or not in angular $scope.
If the value or reference is defined then return the true otherwise return false.
The live demo, click on link http://embed.plnkr.co/Cp2KA2/
Syntax :
angular.isDefined($val);
The isDefined() function is case sensitive and takes
a $val and returns true/false.
JavaScript Code :
var app = angular.module('myApp', []);
app.controller('myCtrl', ['$scope', function ($val) {
$val.welcomeMsg = function () {
if
(angular.isDefined($val.message)) {
$val.lblmessage = 'Welcome
you ' + $val.message + '!';
} else {
$val.lblmessage = 'Please enter
your name';
}
}
}]);
The example in detail as give below
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script src="https://code.angularjs.org/1.4.9/angular.js"></script>
<script>
var app =
angular.module('myApp',
[]);
app.controller('myCtrl', ['$scope', function ($val) {
$val.welcomeMsg = function () {
if
(angular.isDefined($val.message)) {
$val.lblmessage = 'Welcome you ' + $val.message + '!';
} else {
$val.lblmessage = 'Please enter your
name';
}
}
}]);
</script>
</head>
<body ng-app="myApp" ng-controller="myCtrl">
<div>
<input type="text" ng-model="message" placeholder="Type a
message"
/>
<button ng-click="welcomeMsg()">Submit</button>
</div>
<h1>Result : {{lblmessage}}</h1>
</body>
</html>
Result : go for live demo http://embed.plnkr.co/Cp2KA2/
 Function?&via=stc_network)
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Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..
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