Return an array with AJAX

Hi, I'm new to AJAX

I have un page where i want to call an ajax request to add something on this page.
export.php
Code:
<div class="row">
    <div class="span12">
        <select id="listTable" name="listTable">
            <option value="appel">Appels</option>
            <option value="dossier">Dossiers</option>
...