JSFiddle - React, Tailwind, and code Playground

HTML

<form>
    <input id="shortcode_value" readonly value="one">
    <input type="button" onclick="clickme('two');return false;" value="clickme">
</form>

JavaScript

function clickme(res){
	$('#shortcode_value').removeAttr("readonly");
    $("#shortcode_value").val(res) // Не работает
	$('#shortcode_value').attr("readonly", "readonly");
}