本文实例讲述了Zend Framework教程之Zend_Layout布局助手。分享给大家供大家参考,具体如下:
一、作用
布局的作用和模版的作用类似。可以认为是把网站通用、公共的部分拿出来作为通用的页面框架。例如一个基本的web页面,可能页面的头和尾都是一样,不一样的可能只是内容body部分不一样,可以把公共的部分做成模版。不仅可以提高开发效率,也为后期的维护带来方便。
二、使用
这里举一个简单的例子。
首先用zend studio创建一个基本的zend framework项目:layout_demo1
结构大概如下“
├─.settings
├─application
│ ├─configs
│ ├─controllers
│ ├─models
│ └─views
│ ├─helpers
│ └─scripts
│ ├─error
│ └─index
├─docs
├─library
├─public
└─tests
├─application
│ └─controllers
└─library
1.加入layout功能:
应用配置文件/layout_demo2/application/configs/application.ini,加入如下配置
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resources.frontController.controllerDirectory = APPLICATION_PATH "/controllers" resources.frontController.params.displayExceptions = 0 resources.layout.layoutPath = APPLICATION_PATH "/layouts/scripts/" [staging : production] |
2.相应的目录和布局模版文件 /layout_demo2/application/layouts/scripts/layout.phtml
├─application
│ ├─configs
│ ├─controllers
│ ├─layouts
│ │ └─scripts
│ ├─models
│ └─views
layout.html类似如下:
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<!doctype html> < html > < head > < meta http-equiv = "Content-Type" content = "text/html;charset=utf-8" > < title >my app</ title > < body > < div id = "header" > header </ div > < div id = "content" > <? php echo $this -> layout() -> content;?> </ div > < div id = "footer" > header </ div > </ body > </ html > |
这里的
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<?php echo $this -> layout() -> content;?> |
是比较重要的。表示此处为布局的内容,也就是会动态变化的地方。
这样,运行一下程序
www.localzend.com/layout_demo1/public/
生成的html源码如下
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<!doctype html> < html > < head > < meta http-equiv = "Content-Type" content = "text/html;charset=utf-8" > < title >my app</ title > < body > < div id = "header" > header </ div > < div id = "content" > < style > a:link, a:visited { color: #0398CA; } span#zf-name { color: #91BE3F; } div#welcome { color: #FFFFFF; background-image: url(http://framework.zend.com/images/bkg_header.jpg); width: 600px; height: 400px; border: 2px solid #444444; overflow: hidden; text-align: center; } div#more-information { background-image: url(http://framework.zend.com/images/bkg_body-bottom.gif); height: 100%; } </ style > < div id = "welcome" > < h1 >Welcome to the < span id = "zf-name" >Zend Framework!</ span ></ h1 > < h3 >This is your project's main page</ h3 > < div id = "more-information" > < p >< img src = "http://framework.zend.com/images/PoweredBy_ZF_4LightBG.png" /></ p > < p > Helpful Links: < br /> < a href = "http://framework.zend.com/" >Zend Framework Website</ a > | < a href = "http://framework.zend.com/manual/en/" >Zend Framework Manual</ a > </ p > </ div > </ div > </ div > < div id = "footer" > header </ div > </ body > </ html > |
中间部分就是/layout_demo1/application/views/scripts/index/index.phtml的内容。
注入:可以通过zf的命令工具自动生成layout的配置和文件。
命令如下:
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zf enable layout |
可以参考命令行章节
三、配置
1.自定义存放位置和名称可以通过application.ini配置文件配置布局文件的存放位置以及布局文件的名称,例如:
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resources.layout.layoutPath = APPLICATION_PATH "/mylayouts/scripts" resources.layout.layout = "mylayout" |
2.在action中使用layout对象
可以通过
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$layout = $this ->_helper->layout(); |
或者
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$helper = $this ->_helper->getHelper( 'Layout' ); $layout = $helper ->getLayoutInstance(); |
获取布局对象。
可以通过如下方式禁用当前action使用布局模式
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$layout ->disableLayout(); |
可以通过
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$layout ->setLayout( 'other' ); |
来设置使用另一个布局文件
可以通过来传递赋值
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$layout ->assign( 'headertitle' , 'app title' ); $layout ->somekey = "value" |
3.其它获取layout对象的方法
(1)
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$layout = Zend_Layout::getMvcInstance(); |
(2)
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$layout = $bootstrap ->getResource( 'Layout' ); |
四、其它用法,实现原理
具体其它的使用方法可以参考
Zend_Layout_Controller_Action_Helper_Layout类,
Zend_Layout_Controller_Plugin_Layout类
Zend_View_Helper_Layout类
不言自明。
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<?php /** Zend_Controller_Action_Helper_Abstract */ require_once 'Zend/Controller/Action/Helper/Abstract.php' ; /** * Helper for interacting with Zend_Layout objects * * @uses Zend_Controller_Action_Helper_Abstract * @category Zend * @package Zend_Controller * @subpackage Zend_Controller_Action * @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com) * @license http://framework.zend.com/license/new-bsd New BSD License */ class Zend_Layout_Controller_Action_Helper_Layout extends Zend_Controller_Action_Helper_Abstract { /** * @var Zend_Controller_Front */ protected $_frontController ; /** * @var Zend_Layout */ protected $_layout ; /** * @var bool */ protected $_isActionControllerSuccessful = false; /** * Constructor * * @param Zend_Layout $layout * @return void */ public function __construct(Zend_Layout $layout = null) { if (null !== $layout ) { $this ->setLayoutInstance( $layout ); } else { /** * @see Zend_Layout */ require_once 'Zend/Layout.php' ; $layout = Zend_Layout::getMvcInstance(); } if (null !== $layout ) { $pluginClass = $layout ->getPluginClass(); $front = $this ->getFrontController(); if ( $front ->hasPlugin( $pluginClass )) { $plugin = $front ->getPlugin( $pluginClass ); $plugin ->setLayoutActionHelper( $this ); } } } public function init() { $this ->_isActionControllerSuccessful = false; } /** * Get front controller instance * * @return Zend_Controller_Front */ public function getFrontController() { if (null === $this ->_frontController) { /** * @see Zend_Controller_Front */ require_once 'Zend/Controller/Front.php' ; $this ->_frontController = Zend_Controller_Front::getInstance(); } return $this ->_frontController; } /** * Get layout object * * @return Zend_Layout */ public function getLayoutInstance() { if (null === $this ->_layout) { /** * @see Zend_Layout */ require_once 'Zend/Layout.php' ; if (null === ( $this ->_layout = Zend_Layout::getMvcInstance())) { $this ->_layout = new Zend_Layout(); } } return $this ->_layout; } /** * Set layout object * * @param Zend_Layout $layout * @return Zend_Layout_Controller_Action_Helper_Layout */ public function setLayoutInstance(Zend_Layout $layout ) { $this ->_layout = $layout ; return $this ; } /** * Mark Action Controller (according to this plugin) as Running successfully * * @return Zend_Layout_Controller_Action_Helper_Layout */ public function postDispatch() { $this ->_isActionControllerSuccessful = true; return $this ; } /** * Did the previous action successfully complete? * * @return bool */ public function isActionControllerSuccessful() { return $this ->_isActionControllerSuccessful; } /** * Strategy pattern; call object as method * * Returns layout object * * @return Zend_Layout */ public function direct() { return $this ->getLayoutInstance(); } /** * Proxy method calls to layout object * * @param string $method * @param array $args * @return mixed */ public function __call( $method , $args ) { $layout = $this ->getLayoutInstance(); if (method_exists( $layout , $method )) { return call_user_func_array( array ( $layout , $method ), $args ); } require_once 'Zend/Layout/Exception.php' ; throw new Zend_Layout_Exception(sprintf( "Invalid method '%s' called on layout action helper" , $method )); } } |
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<?php /** Zend_Controller_Plugin_Abstract */ require_once 'Zend/Controller/Plugin/Abstract.php' ; /** * Render layouts * * @uses Zend_Controller_Plugin_Abstract * @category Zend * @package Zend_Controller * @subpackage Plugins * @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com) * @license http://framework.zend.com/license/new-bsd New BSD License * @version $Id: Layout.php 23775 2011-03-01 17:25:24Z ralph $ */ class Zend_Layout_Controller_Plugin_Layout extends Zend_Controller_Plugin_Abstract { protected $_layoutActionHelper = null; /** * @var Zend_Layout */ protected $_layout ; /** * Constructor * * @param Zend_Layout $layout * @return void */ public function __construct(Zend_Layout $layout = null) { if (null !== $layout ) { $this ->setLayout( $layout ); } } /** * Retrieve layout object * * @return Zend_Layout */ public function getLayout() { return $this ->_layout; } /** * Set layout object * * @param Zend_Layout $layout * @return Zend_Layout_Controller_Plugin_Layout */ public function setLayout(Zend_Layout $layout ) { $this ->_layout = $layout ; return $this ; } /** * Set layout action helper * * @param Zend_Layout_Controller_Action_Helper_Layout $layoutActionHelper * @return Zend_Layout_Controller_Plugin_Layout */ public function setLayoutActionHelper(Zend_Layout_Controller_Action_Helper_Layout $layoutActionHelper ) { $this ->_layoutActionHelper = $layoutActionHelper ; return $this ; } /** * Retrieve layout action helper * * @return Zend_Layout_Controller_Action_Helper_Layout */ public function getLayoutActionHelper() { return $this ->_layoutActionHelper; } /** * postDispatch() plugin hook -- render layout * * @param Zend_Controller_Request_Abstract $request * @return void */ public function postDispatch(Zend_Controller_Request_Abstract $request ) { $layout = $this ->getLayout(); $helper = $this ->getLayoutActionHelper(); // Return early if forward detected if (! $request ->isDispatched() || $this ->getResponse()->isRedirect() || ( $layout ->getMvcSuccessfulActionOnly() && (! empty ( $helper ) && ! $helper ->isActionControllerSuccessful()))) { return ; } // Return early if layout has been disabled if (! $layout ->isEnabled()) { return ; } $response = $this ->getResponse(); $content = $response ->getBody(true); $contentKey = $layout ->getContentKey(); if (isset( $content [ 'default' ])) { $content [ $contentKey ] = $content [ 'default' ]; } if ( 'default' != $contentKey ) { unset( $content [ 'default' ]); } $layout ->assign( $content ); $fullContent = null; $obStartLevel = ob_get_level(); try { $fullContent = $layout ->render(); $response ->setBody( $fullContent ); } catch (Exception $e ) { while (ob_get_level() > $obStartLevel ) { $fullContent .= ob_get_clean(); } $request ->setParam( 'layoutFullContent' , $fullContent ); $request ->setParam( 'layoutContent' , $layout ->content); $response ->setBody(null); throw $e ; } } } |
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<?php /** Zend_View_Helper_Abstract.php */ require_once 'Zend/View/Helper/Abstract.php' ; /** * View helper for retrieving layout object * * @package Zend_View * @subpackage Helper * @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com) * @license http://framework.zend.com/license/new-bsd New BSD License */ class Zend_View_Helper_Layout extends Zend_View_Helper_Abstract { /** @var Zend_Layout */ protected $_layout ; /** * Get layout object * * @return Zend_Layout */ public function getLayout() { if (null === $this ->_layout) { require_once 'Zend/Layout.php' ; $this ->_layout = Zend_Layout::getMvcInstance(); if (null === $this ->_layout) { // Implicitly creates layout object $this ->_layout = new Zend_Layout(); } } return $this ->_layout; } /** * Set layout object * * @param Zend_Layout $layout * @return Zend_Layout_Controller_Action_Helper_Layout */ public function setLayout(Zend_Layout $layout ) { $this ->_layout = $layout ; return $this ; } /** * Return layout object * * Usage: $this->layout()->setLayout('alternate'); * * @return Zend_Layout */ public function layout() { return $this ->getLayout(); } } |
希望本文所述对大家PHP程序设计有所帮助。