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.

<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 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 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

<?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