JSFiddle - React, Tailwind, and code Playground

by Anik Islam Abhi

HTML

<a href="#" name="usernameMenu" class="dropdown-toggle" data-toggle="dropdown" role="button">
    <span class="glyphicon glyphicon-user"></span>
    <span class="caret"></span>
</a>

<br>
<button id="remove">remove text</button>

JavaScript

$("#remove").on("click", function () {
    $('a[name="usernameMenu"]').find('span')[0].nextSibling.remove();
});
$('a[name="usernameMenu"] span:eq(0)').after("add text here");