JSFiddle - React, Tailwind, and code Playground

by liquidmetalrob

HTML

<form action="#" method="post">
    <fieldset>
        <input type="file" />
    </fieldset>
    <fieldset>
        <input type="submit" />
    </fieldset>
</form>

JavaScript

$(document).ready(
    function(){
        $('input:submit').attr('disabled',true);
        $('input:file').change(
            function(){
                if ($(this).val()){
                    $('input:submit').removeAttr('disabled'); 
                }
                else {
                    $('input:submit').attr('disabled',true);
                }
            });
    }
    );