<?php /** * TButton 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 */ /** * TButton class * * TButton creates a click button on the page. It is mainly used to submit data to a page. * * TButton raises two server-side events, {@link onClick OnClick} and {@link onCommand OnCommand}, * when it is clicked on the client-side. The difference between these two events * is that the event {@link onCommand OnCommand} is bubbled up to the button's ancestor controls. * And within the event parameter for {@link onCommand OnCommand} contains the reference * to the {@link setCommandName CommandName} and {@link setCommandParameter CommandParameter} * property values that are set for the button object. This allows you to create multiple TButton * components on a Web page and programmatically determine which one is clicked * with what parameter. * * Clicking on button can also trigger form validation, if * {@link setCausesValidation CausesValidation} is true. * The validation may be restricted within a certain group of validator * controls by setting {@link setValidationGroup ValidationGroup} property. * If validation is successful, the data will be post back to the same page. * * TButton displays the {@link setText Text} property as the button caption. * * TButton can be one of three {@link setButtonType ButtonType}: Submit, Button and Reset. * By default, it is a Submit button and the form submission uses the browser's * default submission capability. If it is Button or Reset, postback may occur * if one of the following conditions is met: * - an event handler is attached to {@link onClick OnClick} event; * - an event handler is attached to {@link onCommand OnCommand} event; * - the button is in a non-empty validation group. * In addition, clicking on a Reset button will clear up all input fields * if the button does not cause a postback. * * @author Qiang Xue <qiang.xue@gmail.com> * @version $Revision: $ $Date: $ * @package System.Web.UI.WebControls * @since 3.0 */ class TButton extends TWebControl implements IPostBackEventHandler, IButtonControl { /** * @return string tag name of the button */ protected function getTagName() { return 'input'; } /** * Adds attribute name-value pairs to renderer. * This overrides the parent implementation with additional button specific attributes. * @param THtmlWriter the writer used for the rendering purpose */ protected function addAttributesToRender($writer) { $page=$this->getPage(); $page->ensureRenderInForm($this); $writer->addAttribute('type',strtolower($this->getButtonType())); if(($uniqueID=$this->getUniqueID())!=='') $writer->addAttribute('name',$uniqueID); $writer->addAttribute('value',$this->getText()); if($this->getEnabled(true)) { if($this->needPostBackScript()) { $writer->addAttribute('id',$this->getClientID()); $this->getPage()->getClientScript()->registerPostBackControl('Prado.WebUI.TButton',$this->getPostBackOptions()); } } else if($this->getEnabled()) // in this case, parent will not render 'disabled' $writer->addAttribute('disabled','disabled'); parent::addAttributesToRender($writer); } /** * @return boolean whether to perform validation if the button is clicked */ protected function canCauseValidation() { if($this->getCausesValidation()) { $group=$this->getValidationGroup(); return $this->getPage()->getValidators($group)->getCount()>0; } else return false; } /** * @return boolean whether the button needs javascript to do postback */ protected function needPostBackScript() { return $this->canCauseValidation() || ($this->getButtonType()!=='Submit' && ($this->hasEventHandler('OnClick') || $this->hasEventHandler('OnCommand'))); } /** * Returns postback specifications for the button. * This method is used by framework and control developers. * @return array parameters about how the button defines its postback behavior. */ protected function getPostBackOptions() { $options['ID']=$this->getClientID(); $options['CausesValidation']=$this->getCausesValidation(); $options['EventTarget'] = $this->getUniqueID(); $options['ValidationGroup']=$this->getValidationGroup(); return $options; } /** * Renders the body content enclosed between the control tag. * This overrides the parent implementation with nothing to be rendered. * @param THtmlWriter the writer used for the rendering purpose */ public function renderContents($writer) { } /** * This method is invoked when the button is clicked. * The method raises 'OnClick' event to fire up the event handlers. * If you override this method, be sure to call the parent implementation * so that the event handler can be invoked. * @param TEventParameter event parameter to be passed to the event handlers */ public function onClick($param) { $this->raiseEvent('OnClick',$this,$param); } /** * This method is invoked when the button is clicked. * The method raises 'OnCommand' event to fire up the event handlers. * If you override this method, be sure to call the parent implementation * so that the event handlers can be invoked. * @param TCommandEventParameter event parameter to be passed to the event handlers */ public function onCommand($param) { $this->raiseEvent('OnCommand',$this,$param); $this->raiseBubbleEvent($this,$param); } /** * Raises the postback event. * This method is required by {@link IPostBackEventHandler} interface. * If {@link getCausesValidation CausesValidation} is true, it will * invoke the page's {@link TPage::validate validate} method first. * It will raise {@link onClick OnClick} and {@link onCommand OnCommand} events. * This method is mainly used by framework and control developers. * @param TEventParameter the event parameter */ public function raisePostBackEvent($param) { if($this->getCausesValidation()) $this->getPage()->validate($this->getValidationGroup()); $this->onClick(null); $this->onCommand(new TCommandEventParameter($this->getCommandName(),$this->getCommandParameter())); } /** * @return string caption of the button */ public function getText() { return $this->getViewState('Text',''); } /** * @param string caption of the button */ public function setText($value) { $this->setViewState('Text',$value,''); } /** * @return boolean whether postback event trigger by this button will cause input validation, default is true */ public function getCausesValidation() { return $this->getViewState('CausesValidation',true); } /** * @param boolean whether postback event trigger by this button will cause input validation */ public function setCausesValidation($value) { $this->setViewState('CausesValidation',TPropertyValue::ensureBoolean($value),true); } /** * @return string the command name associated with the {@link onCommand OnCommand} event. */ public function getCommandName() { return $this->getViewState('CommandName',''); } /** * @param string the command name associated with the {@link onCommand OnCommand} event. */ public function setCommandName($value) { $this->setViewState('CommandName',$value,''); } /** * @return string the parameter associated with the {@link onCommand OnCommand} event */ public function getCommandParameter() { return $this->getViewState('CommandParameter',''); } /** * @param string the parameter associated with the {@link onCommand OnCommand} event. */ public function setCommandParameter($value) { $this->setViewState('CommandParameter',$value,''); } /** * @return string the group of validators which the button causes validation upon postback */ public function getValidationGroup() { return $this->getViewState('ValidationGroup',''); } /** * @param string the group of validators which the button causes validation upon postback */ public function setValidationGroup($value) { $this->setViewState('ValidationGroup',$value,''); } /** * @return string the type of the button. Defaults to 'Submit'. */ public function getButtonType() { return $this->getViewState('ButtonType','Submit'); } /** * @param string the type of the button. Valid values include 'Submit', 'Reset', 'Button'. */ public function setButtonType($value) { $this->setViewState('ButtonType',TPropertyValue::ensureEnum($value,'Submit','Reset','Button'),'Submit'); } } ?>