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<!DOCTYPE html> <html> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/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>In this example, we will display an error if the field is empty AND the checkbox is checked for "required".</p> </body> </html>
