JQuery / PHP Dropdown Variable For TextArea Value - php

Question

I have a functioning "Account Notes" page that allows the user to add notes to their account for their own uses. I want to allow my admins to input notes into user accounts without logging in. I have a Dropdown on the Admin page that allows the admins to select a user. After selecting the user I want to echo the notes already in their notes section into the TextArea below and allow an update to the notes.
function getNotes(){
global $id;
$result = query("SELECT * FROM `extras` WHERE `userid`=".$id);
while ($row = mysql_fetch_assoc($result)){
return $row['notes'];
}
}
<form action="update.php" method="post">
<h4 class="widgettitle title-primary">Account Notes</h4>
<br/>
<textarea rows="20" scroll="auto" class="txt" name="notes" style="width: 80%;"/><?=getNotes();?></textarea>
<div style="text-align:center;"><button class="btn btn-primary">Update</button></div>
<input type="hidden" name="formtype" value="updatenotes" />
<input type="hidden" name="redir" value="notes.php" />
</form>
</form>
</div>
</div><!--row-fluid-->
All of the above code works correctly, so there are no issues above. My issue lies below...
The following code is what I have on my admin.php page for the user notes addition code...
<div id="addusernotes">
<form action="update.php" method="post">
<h4 class="widgettitle title-primary"><center>Add User Notes</center></h4><br/>
<?php
echo '<select id="user" name="user">';
$user = query("SELECT * FROM `users` ORDER by `user`");
if($user && mysql_num_rows($user))
{
while ($row = mysql_fetch_assoc($user))
{
echo '<option value="'.$row['id'].'">'.$row['user'].'</option>';
}
}
echo '</select>';
?><br/>
Notes:<br/>
<textarea rows="5" scroll="auto" class="txt" name="adminusernotes" style="width: 80%;"/></textarea><br/>
<input type="submit" name="adminnotes" value="Add Notes"><br/><br/>
<input type="hidden" name="formtype" value="adminusernotes" />
<input type="hidden" name="redir" value="admin.php" />
</form>
What JQuery do I need to add to the admin.php file to allow the Notes from the DB to display in the TextArea? I have been stumped on this for nearly 3 days.....Any help will be more than appreciated!!!
FYI....I have intentionally left out some of my "proprietary code for security reasons...

Answer 1

To alter a textarea's content with jQuery, you simply use:
$("#element-id-here").val("whatever value...");
But give your textarea an ID first. And you can change the value to a variable too.
If you want PHP to echo the textarea contents:
<textarea><?php echo "contents here"; ?></textarea>