JSFiddle - React, Tailwind, and code Playground

HTML

<input id="AccountText" type="text" name="AccountText" value="" class="form-control" placeholder="Name" required=''/>
<input class="button" type="submit" value="submit">
<div class="err">

</div>

JavaScript

$(document).ready(function(){
       $('.button').click(function(){
            if ($('#AccountText').val() == ""){
                alert('Please test the field');
            }
        });
    });