I'm facing a strange problem. I'm trying to define a custom field for the frontend-view of my component like this:

defined('JPATH_BASE') or die;


class JFormFieldAssignToUser extends JFormFieldList
    protected $type = 'assigntouser';

    protected function getInput() 
        $html   = array();
        $user   = JFactory::getUser();           
        $html[] = JHtml::_('select.option', "Test", "Test");                            
        $html   = array_merge(parent::getOptions(), $html);
        return $html;

now I'm adding this to my xml:

<field name        = "assigntouser" 
       type        = "assigntouser"    
       label       = "TEST"                
       description = "TEST"
       filter      = "safehtml"
       default     = "">
    <option value = "">TEST</option>

and include it to my layout like that:

<?php echo $this->form->renderFieldset("testfieldset"); ?>

But it only shows this error:

Notice: Array to string conversion in /var/www/web1/htdocs/layouts/joomla/form/renderfield.php on line 35

A field, which is designed in the same way, that is added to the backend of Joomla, works without problems...

1 Answer 1


I think you want to use use getOptions(..) not getInput(...) with a JFormFieldList.

getInput returns the full <select /> input as a string. getOptions populates the select options with an array of <option /> strings.


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