AngularJS ng-required Directive

by Online Tutorials Library July 22, 2022

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:

     <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js" id="ba489871fe4b1d39e04e5d8181d936d3" type="PenciLazyScript"></script>    
<form name="myForm">  Click here to make the input field required:  <input ng-model="myVar" type="checkbox">
<p>  <input name="myInput" ng-model="myInput" ng-required="myVar">  </p>
<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>
<p>      </p>

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