JSFiddle - React, Tailwind, and code Playground

HTML

<form id="myForm" name="nameForm" method="post" action="/echo/html/">Name:
    <input type="text" id="name" name="html" />
    <input type="submit" value="Submit" />
</form>
<div id='error'></div>

CSS

#error {
    color:red
}

JavaScript

$("form").submit(function (e) {
    e.preventDefault();
    var $form = $(this),
        $formId = $form.attr('id'),
        $formName = $form.attr('name');

    //crude validation
    if ($form.find('input[name=html]').val() == "") {
        $('#error').html('Please enter your name.');
    } else {
        //document.forms[$formId].submit();
        document.forms[$formName].submit();
    }

});