JSFiddle - React, Tailwind, and code Playground

HTML

<form>
        <select id="categories"

name="users" onchange="showUser(this.value)">
    <option value="">Select a category:</option>
    <option value="movie">Movie</option>
    <option value="musik">Musik</option>
    <option value="books">Books</option>
    <option value="images">Images</option>
    </select>
    </form>

JavaScript

$("#categories").append("<option value='newvalue'>New Value</option>");