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<?php
/**
* THiddenField class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.xisc.com/
* @copyright Copyright © 2004-2005, Qiang Xue
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
* @version $Revision: $ $Date: $
* @package System.Web.UI.WebControls
*/
/**
* THiddenField class
*
* THiddenField displays a hidden input field on a Web page.
* The value of the input field can be accessed via {@link getValue Value} property.
* If upon postback the value is changed, a {@link onValueChanged OnValueChanged}
* event will be raised.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Revision: $ $Date: $
* @package System.Web.UI.WebControls
* @since 3.0
*/
class THiddenField extends TControl implements IPostBackDataHandler
{
/**
* @return string tag name of the hidden field.
*/
protected function getTagName()
{
return 'input';
}
/**
* Sets focus to this control.
* This method overrides the parent implementation by forbidding setting focus to this control.
*/
public function focus()
{
throw new TNotSupportedException('hiddenfield_focus_unsupported');
}
/**
* Renders the control.
* This method overrides the parent implementation by rendering
* the hidden field input element.
* @param THtmlWriter the writer used for the rendering purpose
*/
protected function render($writer)
{
$uniqueID=$this->getUniqueID();
$this->getPage()->ensureRenderInForm($this);
$writer->addAttribute('type','hidden');
if($uniqueID!=='')
$writer->addAttribute('name',$uniqueID);
if($this->getID()!=='')
$writer->addAttribute('id',$this->getClientID());
if(($value=$this->getValue())!=='')
$writer->addAttribute('value',$value);
$writer->renderBeginTag('input');
$writer->renderEndTag();
}
/**
* Loads hidden field data.
* This method is primarly used by framework developers.
* @param string the key that can be used to retrieve data from the input data collection
* @param array the input data collection
* @return boolean whether the data of the component has been changed
*/
public function loadPostData($key,$values)
{
$value=$values[$key];
if($value===$this->getValue())
return false;
else
{
$this->setValue($value);
return true;
}
}
/**
* Raises postdata changed event.
* This method calls {@link onValueChanged} method.
* This method is primarly used by framework developers.
*/
public function raisePostDataChangedEvent()
{
$this->onValueChanged(null);
}
/**
* This method is invoked when the value of the {@link getValue Value} property changes between posts to the server.
* The method raises 'OnValueChanged' event to fire up the event delegates.
* If you override this method, be sure to call the parent implementation
* so that the attached event handlers can be invoked.
* @param TEventParameter event parameter to be passed to the event handlers
*/
public function onValueChanged($param)
{
$this->raiseEvent('OnValueChanged',$this,$param);
}
/**
* @return string the value of the THiddenField
*/
public function getValue()
{
return $this->getViewState('Value','');
}
/**
* Sets the value of the THiddenField
* @param string the value to be set
*/
public function setValue($value)
{
$this->setViewState('Value',$value,'');
}
/**
* @return boolean whether theming is enabled for this control. Defaults to false.
*/
public function getEnableTheming()
{
return false;
}
/**
* @param boolean whether theming is enabled for this control.
* @throws TNotSupportedException This method is always thrown when calling this method.
*/
public function setEnableTheming($value)
{
throw new TNotSupportedException('hiddenfield_theming_unsupported');
}
/**
* @param string Skin ID
* @throws TNotSupportedException This method is always thrown when calling this method.
*/
public function setSkinID($value)
{
throw new TNotSupportedException('hiddenfield_skinid_unsupported');
}
}
?>
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