AngularJS ng-required Directive

The AngularJS ng-required directive is used to add the required validator to ng-model. It is mainly used for input and select control but it can also be used for custom controls.

The ng-required directive is necessary to makes you able to shift the value between true and false. In HTML, the required attribute cannot be set to false.

It is supported by <input>, <select>, and <textarea> and other editable elements.

Syntax:

Parameter explanation:

expression: It specifies an expression that will set the required attribute if it returns true.

Let's take an example to demonstrate the usage of ng-required directive.

See this example:

<!DOCTYPE html>
<html>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body ng-app="">
<form name="myForm">
Click here to make the input field required:
<input type="checkbox" ng-model="myVar"><br><br>
<input name="myInput" ng-model="myInput" ng-required="myVar">
<h1 ng-if="!myForm.myInput.$valid">The input field cannot be empty</h1>
</form>
<p><strong>Note:</strong> This example shows an error if the input field is empty <strong>and</strong>
 the checkbox is checked for "required".</p>
</body>
</html>

Test it Now

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