JSFiddle - React, Tailwind, and code Playground

HTML

<form method="POST" action="#">
    <input type="text" id="edit-combine" name="combined"/>
    <input type="submit" id="edit-submit-clone-of-combined-search" value="search"/>
</form>

JavaScript

$('#edit-combine').on("keyup", function () {
    $('#edit-submit-clone-of-combined-search').prop("disabled", $('#edit-combine').val().length == 0);
}).keyup();