JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://jquery.bassistance.de/validate/jquery.validate.js"></script>
<form method="post" id="form">
    <input id="E_Mail" name="E_mail" title="E_mail" required="required" /><br />
    <input class="submit" type="submit" value="Send"/>
</form>

JavaScript

jQuery(function($) {
    $("#form").validate({
        debug: false,
        focusInvalid: false,
        onfocusout: false,
        onkeyup: false,
        onclick: false,
        rules: {
            E_mail: {
                required: true,
                email: true
            },
        },
        success: function(label) {
            alert('succes:' + label);
        },
        submitHandler: function(form) {
            alert('start submitHandler');
            postContent('test');
            alert('end submitHandler');
        },
        invalidHandler: function(form, validator) {
            alert('invalidHandler');
        },
    });
});


function postContent(postData) {
    alert('postcontent: ' + postData);

}