JSFiddle - React, Tailwind, and code Playground

HTML

<form method="post">
    <input type="text" name="name1" id="name1" class="number" />
    <input type="text" name="name2" id="name2" class="number" />
    <input type="submit" name="send" id="send" class="hey" value="one" disabled />
</form>

JavaScript

function doCheck() {
    var allFilled = true;
    $('input[type=text]').each(function () {
        if ($(this).val() == '') {
            allFilled = false;
            return false;
        }
    });
    $('input[type=submit]').prop('disabled', !allFilled);
}

$(document).ready(function () {
    $('input[type=text]').keyup(doCheck);
});