JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" name="textField" />
<input type="submit" value="send" />

JavaScript

$('input[type="submit"]').attr('disabled', true);
$('input[type="text"]').on('keyup',function() {
    if($(this).val() != '') {
        $('input[type="submit"]').attr('disabled' , false);
    }else{
        $('input[type="submit"]').attr('disabled' , true);
    }
});