<?php /** * TLinkButton 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 */ /** * TLinkButton class * * TLinkButton creates a hyperlink style button on the page. * TLinkButton has the same appearance as a hyperlink. However, it is mainly * used to submit data to a page. Like {@link TButton}, you can create either * a <b>submit</b> button or a <b>command</b> button. * * A <b>command</b> button has a command name (specified by * the {@link setCommandName CommandName} property) and and a command parameter * (specified by {@link setCommandParameter CommandParameter} property) * associated with the button. This allows you to create multiple TLinkButton * components on a Web page and programmatically determine which one is clicked * with what parameter. You can provide an event handler for * {@link onCommand Command} event to programmatically control the actions performed * when the command button is clicked. In the event handler, you can determine * the {@link setCommandName CommandName} property value and * the {@link setCommandParameter CommandParameter} property value * through the {@link TCommandParameter::getName Name} and * {@link TCommandParameter::getParameter Parameter} properties of the event * parameter which is of type {@link TCommandEventParameter}. * * A <b>submit</b> button does not have a command name associated with the button * and clicking on it simply posts the Web page back to the server. * By default, a TLinkButton component is a submit button. * You can provide an event handler for the {@link onClick Click} event * to programmatically control the actions performed when the submit button is clicked. * * Clicking on button can trigger form validation, if * {@link setCausesValidation CausesValidation} is true. * And 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. * You can change the postback target by setting the {@link setPostBackUrl PostBackUrl} * property. * * TLinkButton will display the {@link setText Text} property value * as the hyperlink text. If {@link setText Text} is empty, the body content * of TLinkButton will be displayed. Therefore, you can use TLinkButton * as an image button by enclosing an <img> tag as the body of TLinkButton. * * @author Qiang Xue <qiang.xue@gmail.com> * @version $Revision: $ $Date: $ * @package System.Web.UI.WebControls * @since 3.0 */ class TLinkButton extends TWebControl implements IPostBackEventHandler { /** * @return string tag name of the button */ protected function getTagName() { return 'a'; } /** * 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); $writer->addAttribute('id',$this->getClientID()); // We call parent implementation here because some attributes // may be overwritten in the following parent::addAttributesToRender($writer); if($this->getEnabled(true)) { $url = $this->getPostBackUrl(); //create unique no-op url references $nop = "#".$this->getClientID(); $writer->addAttribute('href', $url ? $url : $nop); $this->getPage()->getClientScript()->registerPostBackControl($this); } else if($this->getEnabled()) // in this case, parent will not render 'disabled' $writer->addAttribute('disabled','disabled'); } /** * Returns postback specifications for the button. * This method is used by framework and control developers. * @return TPostBackOptions parameters about how the button defines its postback behavior. */ public function getPostBackOptions() { $options['EventTarget'] = $this->getUniqueID(); $options['CausesValidation'] = $this->getCausesValidation(); $options['ValidationGroup'] = $this->getValidationGroup(); $options['PostBackUrl'] = $this->getPostBackUrl(); $options['StopEvent'] = true; return $options; } /** * Renders the body content enclosed between the control tag. * If {@link getText Text} is not empty, it will be rendered. Otherwise, * the body content enclosed in the control tag will be rendered. * @param THtmlWriter the writer used for the rendering purpose */ protected function renderContents($writer) { if(($text=$this->getText())==='') parent::renderContents($writer); else $writer->write($text); } /** * @return string the text caption of the button */ public function getText() { return $this->getViewState('Text',''); } /** * Sets the text caption of the button. * @param string the text caption to be set */ public function setText($value) { $this->setViewState('Text',$value,''); } /** * @return string the command name associated with the {@link onCommand Command} event. */ public function getCommandName() { return $this->getViewState('CommandName',''); } /** * Sets the command name associated with the {@link onCommand Command} event. * @param string the text caption to be set */ public function setCommandName($value) { $this->setViewState('CommandName',$value,''); } /** * @return string the parameter associated with the {@link onCommand Command} event */ public function getCommandParameter() { return $this->getViewState('CommandParameter',''); } /** * Sets the parameter associated with the {@link onCommand Command} event. * @param string the text caption to be set */ public function setCommandParameter($value) { $this->setViewState('CommandParameter',$value,''); } /** * @return string the URL of the page to post to when the button is clicked, default is empty meaning post to the current page itself */ public function getPostBackUrl() { return $this->getViewState('PostBackUrl',''); } /** * @param string the URL of the page to post to from the current page when the button is clicked, empty if post to the current page itself */ public function setPostBackUrl($value) { $this->setViewState('PostBackUrl',$value,''); } /** * @return boolean whether postback event trigger by this button will cause input validation */ public function getCausesValidation() { return $this->getViewState('CausesValidation',true); } /** * Sets the value indicating whether postback event trigger by this button will cause input validation. * @param string the text caption to be set */ public function setCausesValidation($value) { $this->setViewState('CausesValidation',$value,true); } /** * @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,''); } /** * 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 Click} and {@link onCommand Command} 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(),$this->getCommandParameter())); } /** * This method is invoked when the button is clicked. * The method raises 'Click' event to fire up the event handlers. * If you override this method, be sure to call the parent implementation * so that the event handler can be invoked. * @param TEventParameter event parameter to be passed to the event handlers */ public function onClick($param) { $this->raiseEvent('Click',$this,$param); } /** * This method is invoked when the button is clicked. * The method raises 'Command' event to fire up the event handlers. * If you override this method, be sure to call the parent implementation * so that the event handlers can be invoked. * @param TCommandEventParameter event parameter to be passed to the event handlers */ public function onCommand($param) { $this->raiseEvent('Command',$this,$param); $this->raiseBubbleEvent($this,$param); } } ?>