protected function getInput()
{
// JFormFieldUsergroup generates the value as an object e.g: (object(JObject)#247 (4) { ["_errors"rotected]=> array(0) {} [0] => 12, [1] => ,18)
// we force the value to be an array
$this->value = is_array($this->value) ? $this->value : explode(',', $this->value);
$input = parent::getInput();
if ($groups = self::getAdminGroups()) {
$replacements = array();
foreach ($groups as $group) {
$replacements['value="' . $group . '"'] = 'value="" disabled="disabled"';
}
$input = str_replace(array_keys($replacements), array_values($replacements), $input);
}
return $input;
}
