magento 模块重写

以重写 app/code/core/Mage/Catalog/Block/Navigation.php 为例

1. 复制Mage (不推荐使用 )

First add a new Navigation.php file you can edit to your local folder that Magento will reference instead of the original.

Copy the original found here: app/code/core/Mage/Catalog/Block/Navigation.php

Recreate this folder structure in your app/code/local folder. So go to app/code/local, make a Mage folder, inside it make a Catalog folder, inside that make a Block folder, and inside that place your copy of Navigation.php, eg: app/code/local/Mage/Catalog/Block/Navigation.php

Second, add some code to the app/etc/local.xml file, inside of the global tags.

Xml代码


<blocks>

<catalog>

<rewrite>

<navigation>Mage_Catalog_Block_Navigation</navigation>

</rewrite>

</catalog>

</blocks>

2. 重写 (推荐 )

If you want to override a core controller on Magento in order to add other customActions, it is really quick and easy to do so. Here are the files that you have to take into account:

The block you want to override : /app/code/core/Mage/Catalog/Block/Navigation.php
The xml file to enable the module: /app/etc/modules/[namespace] _All.xml
The block xml file definition : /app/code/local/[namespace] /Catalog/etc/config.xml
The overridden block : /app/code/local/[namespace] /Catalog/Block/Navigation.php

本文中所有 [namespace] 将被取代为我自己实例的名称 “App”，如果你想要用其他命名空间，可以替换[namespace]

First of all, you have to enable the module on the /app/etc/modules/ directory. This file would be App _All.xml and inside that:

Xml代码


<?xml version="1.0"?>

<config>

<modules>

<App_Catalog>

<active>true</active>

<codePool>local</codePool>

<!--depends>

<Mage_Core/>

</depends-->

</App_Catalog>

</modules>

</config>

开启depends的话，表示依靠core class，

Now it’s time to create the /app/code/local/App /Catalog/etc/config.xml file that will override the core block:

Xml代码


<?xml version="1.0" encoding="UTF-8"?>

<config>

<modules>

<App_Catalog>

<version>0.1.0</version>

</App_Catalog>

</modules>

<global>

<blocks>

<catalog>

<rewrite>

<navigation>App_Catalog_Block_Navigation</navigation>

</rewrite>

</catalog>

</blocks>

</global>

</config>

注意：<navigation>App_Catalog_Block_Navigation</navigation> 中 App_Catalog_Block_Navigation 不能随便起名，一定要形成正确完整的路径， [namespace] _Catalog_Block_Navigation =>[namespace]/Catalog/Block/Navigation.php

Finally, we can create the class that will add/change actions to the core block:app/code/local/App/Catalog/Block/Navigation.php

Java代码


<?php

class App_Catalog_Block_Navigation extends Mage_Catalog_Block_Navigation

{

protected function _renderCategoryMenuItemHtml($category, $level = 0, $isLast = false, $isFirst = false,

$isOutermost = false, $outermostItemClass = '', $childrenWrapClass = '', $noEventAttributes = false, $showText = false)

{

/* .... */

}

}

注意： class是继承了原来的Mage_Catalog_Block_Navigation

注意：如果要看效果，要清理cache先，或者在后台 disable cache