JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<input type=text id=password> <br>
<input type=text id=confirm> <br>
<button type="submit" disabled> Submit </button>

JavaScript

$('#password').on("input", function() { validatePassword(); });

$('#confirm').on("input", function() { validatePassword(); });

function validatePassword() {
    if($('#password').val() && $('#confirm').val() && $('#password').val() == $('#confirm').val()) {
        $('button').prop('disabled', false);
    } else {
        $('button').prop('disabled', true);
    }
}