<?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 $Id$ * @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 $Id$ * @package System.Web.UI.WebControls * @since 3.0 */ class THiddenField extends TControl implements IPostBackDataHandler, IValidatable { /** * @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); $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; } } /** * 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(); } /** * 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'); } } ?>