JSFiddle - React, Tailwind, and code Playground
HTML
<div ng-app="" ng-controller="validateCtrl" name="myForm" novalidate ng-form>
<p>Username:<br>
<input type="text" name="user.name" ng-model="user" required/>
<span style="color:red" ng-show="myForm['user.name'].$dirty && myForm['user.name'].$invalid">
<span ng-show="myForm['user.name'].$error.required">Username is required.</span>
</span>
</p>
</div>
JavaScript
function validateCtrl($scope){
}