/**
* Add the 'Use Config Settings' checkbox to the input element
*
* @param Varien_Data_Form_Element_Abstract $element
* @return string
*/
public function render(Varien_Data_Form_Element_Abstract $element)
{
$id = 'use_config_' . $element->getId();
$checkbox = new Varien_Data_Form_Element_Checkbox(array('html_id' => $id, 'name' => $id));
$checkbox->setForm($element->getForm());
$checkbox->setAfterElementHtml(' <label for="' . $id . '">' . $this->helper('adminhtml')->__('Use Config Settings') . '</label>' . $this->getElementJs());
$checkbox->setOnclick(sprintf("if(this.checked){\$('%s').disabled=true;}else{\$('%s').disabled=false;}", $element->getForm()->getHtmlIdPrefix() . $element->getId(), $element->getForm()->getHtmlIdPrefix() . $element->getId()));
if (!$element->getValue()) {
$checkbox->setChecked(true);
$element->setDisabled(true);
if (preg_match("/^carousel_([a-z_]{1,})\$/", $element->getId(), $result)) {
$element->setValue(Mage::getStoreConfig('ibanners/carousel/' . $result[1]));
}
}
$element->setNote($checkbox->getElementHtml());
return parent::render($element);
}
