Fatal error: Class 'JElement' not found in self defined parameters.

[pherfinion]

I Try to add a self defined parameter. Here the beginning of the code

defined('JPATH_BASE') or die('RESTRICTED');
class JElementMyList extends JElement

but I always get Fatal error: Class 'JElement' not found. Then i try
to import

jimport("joomla.html.parameter.element");

that works so far, but i get only a text field??

[pherfinion]

now I'll take the sql.php from original joomla and modify only two
Lines
class JElementMYSQL extends JElement
{
/**
* Element name
*
* @var string
*/
protected $_name = 'MYSQL';

And rename the file to mysql.php. But i get a textfield??

[elin]

Is there a reason you are not using JFormField? Parameter is deprecated and your code won't work in future releases. 

What is the field supposed to be doing? 

Elin

[pherfinion]

I would like to create a multiple select field for the config.xml. Here, all components are displayed, so that it is possible to select multiple components.

[elin]

Are you saying that you trying to use an sql type field? 

Elin

[pherfinion]

Yes, but in a standard sql field I can't select multiple values.

[elin]

[elin]

Try Multiple=multiple