/**
* Render the chooser HTML
* Target element should be set.
*
* @return string
*/
protected function _toHtml()
{
if (empty($this->_targetElementId)) {
return '';
}
$idSuffix = Mage::helper('Mage_Core_Helper_Data')->uniqHash();
$form = new Varien_Data_Form();
foreach (array('from' => Mage::helper('Mage_Adminhtml_Helper_Data')->__('From'), 'to' => Mage::helper('Mage_Adminhtml_Helper_Data')->__('To')) as $key => $label) {
$id = "{$key}_{$idSuffix}";
$element = new Varien_Data_Form_Element_Date(array('format' => Varien_Date::DATE_INTERNAL_FORMAT, 'label' => $label, 'image' => $this->getViewFileUrl('images/grid-cal.gif'), 'onchange' => "dateTimeChoose_{$idSuffix}()", 'value' => $this->_rangeValues[$key]));
$element->setId($id);
$form->addElement($element);
}
return $form->toHtml() . "<script type=\"text/javascript\">\n dateTimeChoose_{$idSuffix} = function() {\n \$('{$this->_targetElementId}').value = \$('from_{$idSuffix}').value + '{$this->_rangeDelimiter}' + \$('to_{$idSuffix}').value;\n };\n </script>";
}