JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#" id="link">Show B</a>
<div id="tog_A">A</div>
<div id="tog_B" style="display:none;">B</div>

JavaScript

$("#link").click(function() {
    $("div[id^=tog_]").toggle();
    $(this).text("Show " + $("div[id^=tog_]").not(":visible").attr("id").substr(4));
});