ModX Evolution: pass variable from url to form text field on page load

I need to pass string from url:

..开发者_StackOverflow社区/page.html?code=123456

to a form (eform snippet in modx) just once is page loaded (link with url and parameter) Thanks for answer...

My solution:
1. create a new snippet called GetCode

<?php
if( !function_exists('eformGetCode') ) {
function eformGetCode(&$fields,&$templates){
global $modx;
$code = strip_tags($_GET['codeID']);
$templates['tpl']=str_replace('[+display_code+]',$code,$templates['tpl']);
return true; } }
return '';
?>

2. Add eform call (and snippet) on webpage:

[!GetCode!]
[!eForm? ... ... &eFormOnBeforeFormParse=`eformGetCode` !]

3. In eform chunk with form code add line:

<input name="code" id="code" value="[+display_code+]" eform="::1:" type="text"/>

5. Now when you put parametr in url like:

..../page.html?code=123456

this should appear in form.

you would do this exactly like you would in php..

$myVar = $_GET['code'];

If you are having issues, take a peek in the modx error logs...

-sean

Solution by KudyKam is better than official solution in MODX docs, in which they use a database. http://wiki.modxcms.com/index.php/Populate_eform_with_dynamic_data