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<?php
/**
* TDropDownList class file
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Revision: $ $Date: $
* @package System.Web.UI.WebControls
*/
/**
* TDropDownList class
*
* TDropDownList displays a dropdown list on a Web page.
* It inherits all properties and events from {@link TListControl}.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Revision: $ $Date: $
* @package System.Web.UI.WebControls
* @since 3.0
*/
class TDropDownList extends TListControl implements IPostBackDataHandler
{
/**
* Adds attributes to renderer.
* @param THtmlWriter the renderer
*/
protected function addAttributesToRender($writer)
{
$writer->addAttribute('name',$this->getUniqueID());
parent::addAttributesToRender($writer);
}
/**
* Loads user input data.
* This method is primarly used by framework developers.
* @param string the key that can be used to retrieve data from the input data collection
* @param array the input data collection
* @return boolean whether the data of the component has been changed
*/
public function loadPostData($key,$values)
{
if(!$this->getEnabled(true))
return false;
$this->ensureDataBound();
$selection=isset($values[$key])?$values[$key]:null;
if($selection!==null)
{
$index=$this->getItems()->findIndexByValue($selection,false);
if($this->getSelectedIndex()!==$index)
{
$this->setSelectedIndex($index);
return true;
}
}
return false;
}
/**
* Raises postdata changed event.
* This method is required by {@link IPostBackDataHandler} interface.
* It is invoked by the framework when {@link getSelectedIndex SelectedIndex} property
* is changed on postback.
* This method is primarly used by framework developers.
*/
public function raisePostDataChangedEvent()
{
$page=$this->getPage();
if($this->getAutoPostBack() && !$page->getPostBackEventTarget())
{
$page->setPostBackEventTarget($this);
if($this->getCausesValidation())
$page->validate($this->getValidationGroup());
}
$this->onSelectedIndexChanged(null);
}
/**
* @return integer the index (zero-based) of the item being selected.
* If none is selected, the return value is 0 meaning the first item is selected.
* If there is no items, it returns -1.
*/
public function getSelectedIndex()
{
$index=parent::getSelectedIndex();
if($index<0 && $this->getHasItems())
{
$this->setSelectedIndex(0);
return 0;
}
else
return $index;
}
}
?>
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