AngularJs Check if a key exists in an object
AngularJs Check if a key exists in an object : There are many ways to check whether a key value exists in an object or not. You can use pure JavaScript to check a key. Here in this tutorial we are going to explain how you can check that a key exists in an object or not. You can use our online editor to edit and run the code online.
AngularJs Check if a key exists in an object Example
You can simply use the (“key” in obj1) to check a key in an object it will return false if the key does not exist in object else it will return true. Here is an example to check key in javascript/angularjs object.
AngularJs Check if a key exists in an object Example:
<!DOCTYPE html>
<html lang="en">
<head>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.13/angular.min.js"></script>
<script>
var myApp = angular.module("myApp", []);
myApp.controller("myController", function($scope) {
$scope.obj1 = {"key1":99};
$scope.result = '';
$scope.textvalue = "key1";
$scope.checkKey = function() {
var txtVal = $scope.textvalue;
if(!(txtVal in $scope.obj1)){
$scope.result = "Key not Found.";
}else{
$scope.result = "Key Exists in Object obj1.";
}
}
});
</script>
</head>
<body>
<div ng-app="myApp">
<div ng-controller="myController">
<input type="text" ng-model="textvalue" ><br>
<button ng-click ="checkKey()" >Check Key Exists</button>
<br>
Result = {{result}}<br>
</div>
</div>
</body>
</html>
|
If you run the above example it will produce output something like this –
Advertisements
