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<!DOCTYPE html> <html> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script> <style> input.ng-invalid { background-color: lightblue; } </style> <body> <form ng-app="" name="myForm"> Enter your name: <input name="myName" ng-model="myText" required> </form> <p>Edit the text field and it will get/lose classes according to the status.</p> <p><b>Note:</b> A text field with the "required" attribute is not valid when it is empty.</p> </body> </html>
