Introduction
I expected wordpress to have some built in support for listing all authors of the blog in a select box but that is not the case yet in Wordpress 2.9.2.
I was certain that I can get this done using
wp_list_authors but actually it was a not that straight forward and so let me share this with you. I think this will help those looking for such functionality.The Code
What I did is replaced the content of list items ( <li> ) into select box options ( <option> ) and added a JavaScript function to redirect user to the url when there is a change in the selection in the selection box.
So here is the code.
Code:
<select id="AuthorList" name="AuthorList" onchange="goAuthorList();">
<?php
$authargs = array(
'optioncount' => false,
'exclude_admin' => false,
'show_fullname' => false,
'hide_empty' => true,
'echo' => false, // We will not output using the function.
'feed' => false,
'feed_image' => false,
'style' => 'list',
'html' => true
);
$var_list = wp_list_authors( $authargs ); // Take the output into a variable.
// Replace the tags of list to option box
$var_list = str_replace("</a></li>","</option>",$var_list);
$var_list = str_replace("<li><a href=","<option value=",$var_list);
// Now output the list
echo $var_list;
?>
</select>
<script language="JavaScript">
<!--
function goAuthorList() {
// JavaScript function to change the user to the url of the author
theSelAuthor = document.getElementById("AuthorList").value;
if ("" != theSelAuthor) location.href = theSelAuthor;
}
//-->
</script>
Really nice info, Good contributory share 
@ shabbir! 