JSFiddle - React, Tailwind, and code Playground

HTML

<p> 
    <select id="page_selection">
        <option value="edit1">About All</option>
        <option value="edit2">Home Introduction</option>
    </select>
    <form method="post" action="page_edit_action.php" />
        <textarea name="about_all" id="edit1">Test About</textarea>
        <textarea name="home_introduction" id="edit2">Test Home</textarea>
    </form>
    </p>

JavaScript

$(function(){
    $('#edit1, #edit2').hide();
    $("#page_selection").change(function(){
        $("#" + this.value).show().siblings().hide();
    }).change();
});