背景是往一个第三方的搜索插件里面加入filter功能。
首先是路径，插件自己定义了一个router，类似于cms。那首先说说router好了，从入口一路追查的话，会发现最后进入的是Mage_Core_Controller_Varien_Front类下面的dispatch()函数。
public function dispatch()
{
$request = $this->getRequest(); // If pre-configured, check equality of base URL and requested URL
$this->_checkBaseUrl($request); $request->setPathInfo()->setDispatched(false); $this->_getRequestRewriteController()->rewrite(); Varien_Profiler::start('mage::dispatch::routers_match');
$i = 0;
while (!$request->isDispatched() && $i++ < 100) {
foreach ($this->_routers as $router) {
/** @var $router Mage_Core_Controller_Varien_Router_Abstract */
if ($router->match($request)) {
break;
}
}
}
Varien_Profiler::stop('mage::dispatch::routers_match');
if ($i>100) {
Mage::throwException('Front controller reached 100 router match iterations');
}
// This event gives possibility to launch something before sending output (allow cookie setting)
Mage::dispatchEvent('controller_front_send_response_before', array('front'=>$this));
Varien_Profiler::start('mage::app::dispatch::send_response');
$this->getResponse()->sendResponse();
Varien_Profiler::stop('mage::app::dispatch::send_response');
Mage::dispatchEvent('controller_front_send_response_after', array('front'=>$this));
return $this;
}
前面的代码是把url链接里的各项参数放到request类里面，方便后面调用，从第14行开始，magento会把所有继承自Mage_Core_Controller_Varien_Router_Abstract类的函数拉出来一个个循环match函数，直到找到一个匹配request的。
也就是说假如我想自定义路径，就可以继承Mage_Core_Controller_Varien_Router_Abstract类，然后在match函数里写上自己的路由规则，一旦匹配就跳转到自己想他去的controller类。
不过很显然插件自定义的router并不能很好的完成filter的工作，首先贴上，插件的原来的代码：
public function match(Zend_Controller_Request_Http $request)
{
$identifier = trim($request->getPathInfo(), '/'); $condition = new Varien_Object(array(
'identifier' => $identifier,
'continue' => true,
)); $identifier = $condition->getIdentifier(); if ($condition->getRedirectUrl()) {
Mage::app()->getFrontController()->getResponse()
->setRedirect($condition->getRedirectUrl())
->sendResponse();
$request->setDispatched(true); return true;
} if (!$condition->getContinue()) {
return false;
} $page = Mage::getModel('searchlandingpage/page')->checkIdentifier($identifier);
//代码原理很简单，对url里的路径拆解，然后查询这个路径是否在自定义的表里面，checkIdentifier（）就是sql查询。
if (!$page) {
return false;
} $request->setModuleName('searchlandingpage')
->setControllerName('page')
->setActionName('view')
->setParam('q', $page->getQueryText())
->setParam('id', $page->getId());
//若查询到了就设置request里的各项参数，告诉magento跳转到这里去
$request->setAlias(
Mage_Core_Model_Url_Rewrite::REWRITE_REQUEST_PATH_ALIAS,
$identifier
); return true;
}
修改后：
public function match(Zend_Controller_Request_Http $request)
{
$helper = Mage::helper('ajaxpriceslider');
$suffix = Mage::getStoreConfig('catalog/seo/category_url_suffix');
$identifier = ltrim($request->getPathInfo(), '/');
$identifier = substr($identifier, 0, strlen($identifier) - strlen($suffix));
$urlSplit = explode($helper->getRoutingSuffix(), $identifier, 2); if(isset($urlSplit[0])){
$cat = $urlSplit[0];
}else{
$cat = $identifier;
}
//这里主要作用是给自定义的路径添加magento的后缀， 如 xxx.html 之类 $condition = new Varien_Object(array(
'identifier' => $cat,
'continue' => true,
)); $cat = $condition->getIdentifier(); if ($condition->getRedirectUrl()) {
Mage::app()->getFrontController()->getResponse()
->setRedirect($condition->getRedirectUrl())
->sendResponse();
$request->setDispatched(true); return true;
} if (!$condition->getContinue()) {
return false;
} $page = Mage::getModel('searchlandingpage/page')->checkIdentifier($cat); if (!$page) {
return false;
} $request->setModuleName('searchlandingpage')
->setControllerName('page')
->setActionName('view')
->setParam('q', $page->getQueryText())
->setParam('id', $page->getId()); $request->setAlias(
Mage_Core_Model_Url_Rewrite::REWRITE_REQUEST_PATH_ALIAS,
$cat.$suffix
);
// 解析url参数，例如xxx.com/search/chiken_run/shopby/color/brown,green,white-and-green.html的网址，shopby后面的参数会被解析成array('color'=>'brown,green,white-and-green')
$params = explode('/', trim($urlSplit[1], '/'));
$layerParams = array();
$total = count($params);
for ($i = 0; $i < $total - 1; $i++) {
if (isset($params[$i + 1])) {
$layerParams[$params[$i]] = urldecode($params[$i + 1]);
++$i;
}
} $layerParams += $request->getPost();
$request->setParams($layerParams); // 这个生成链接用
Mage::register('layer_params', $layerParams);
$controllerClassName = $this->_validateControllerClassName('Mirasvit_SearchLandingPage', 'page'); $controllerInstance = Mage::getControllerInstance($controllerClassName, $request, $this->getFront()->getResponse());
// 这个是立即执行自己定义的controller类的view函数，不这样做的话，magento会继续加载两个系统router 然后修改了$params,导致我删选数据出问题
$request->setDispatched(true);
$controllerInstance->dispatch('view'); return true;
}
以上路径修改完了，在点击删选的时候 ajax寻址就能寻到了，但是返回的数据还是有问题的，这时候就需要修改 刚刚定义的controller下面的view函数了。
其实修改就一步，将$this->renderLayout();修改成
if ($this->getRequest()->isAjax()) {
$listing = $this->getLayout()->getBlock('search_result_list')->toHtml();//根据页面的layout不同，这里的getBlock也会不同，下面也是
$layer = $this->getLayout()->getBlock('catalogsearch.leftnav')->toHtml();
// Fix urls that contain '___SID=U'
$urlModel = Mage::getSingleton('core/url');
$listing = $urlModel->sessionUrlVar($listing);
$layer = $urlModel->sessionUrlVar($layer);
$response = array(
'listing' => $listing,
'layer' => $layer
);
$this->getResponse()->setHeader('Content-Type', 'application/json', true);
$this->getResponse()->setBody(json_encode($response));
} else {
$this->renderLayout();
}
到这一步删选功能正常了，至于他是如何工作的，我有空补上