JSFiddle - React, Tailwind, and code Playground
HTML
<form method='POST' action='http://www.google.com'>
<input type="submit" id="postpayment" name="postpayment" class="btn btn-primary" value="Post" />
<input type="submit" id="load" name="load" class="btn btn-primary" value="Load" />
</form>
JavaScript
$(function () {
$('#postpayment').click(function (event) {
event.preventDefault();
$('#load').prop('disabled', true);
});
});