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<?php
/**
* THiddenField class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.xisc.com/
* @copyright Copyright © 2005-2016 The PRADO Group
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
* @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>
* @package System.Web.UI.WebControls
* @since 3.0
*/
class THiddenField extends TControl implements IPostBackDataHandler, IValidatable, IDataRenderer
{
private $_dataChanged=false;
private $_isValid=true;
/**
* @return string tag name of the hidden field.
*/
protected function getTagName()
{
return 'input';
}
/**
* Sets focus to this control.
* This method overrides the parent implementation by forbidding setting focus to this control.
*/
public function focus()
{
throw new TNotSupportedException('hiddenfield_focus_unsupported');
}
/**
* Renders the control.
* This method overrides the parent implementation by rendering
* the hidden field input element.
* @param THtmlWriter the writer used for the rendering purpose
*/
public function render($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);
if($this->getHasAttributes())
{
foreach($this->getAttributes() as $name=>$value)
$writer->addAttribute($name,$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 $this->_dataChanged=true;
}
}
/**
* Returns a value indicating whether postback has caused the control data change.
* This method is required by the IPostBackDataHandler interface.
* @return boolean whether postback has caused the control data change. False if the page is not in postback mode.
*/
public function getDataChanged()
{
return $this->_dataChanged;
}
/**
* Returns the value to be validated.
* This methid is required by IValidatable interface.
* @return mixed the value of the property to be validated.
*/
public function getValidationPropertyValue()
{
return $this->getValue();
}
/**
* Returns true if this control validated successfully.
* Defaults to true.
* @return bool wether this control validated successfully.
*/
public function getIsValid()
{
return $this->_isValid;
}
/**
* @param bool wether this control is valid.
*/
public function setIsValid($value)
{
$this->_isValid=TPropertyValue::ensureBoolean($value);
}
/**
* 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,'');
}
/**
* Returns the value of the hidden field.
* This method is required by {@link IDataRenderer}.
* It is the same as {@link getValue()}.
* @return string value of the hidden field
* @see getValue
* @since 3.1.0
*/
public function getData()
{
return $this->getValue();
}
/**
* Sets the value of the hidden field.
* This method is required by {@link IDataRenderer}.
* It is the same as {@link setValue()}.
* @param string value of the hidden field
* @see setValue
* @since 3.1.0
*/
public function setData($value)
{
$this->setValue($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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