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I'm trying to use an observer in magento to completely replace the entire layout for a given request based on a parameter in the request.
The issue I'm facing is that Magento is still trying to load a different root block template than the one I specified in my Observer (specifically "frontend/base/default/template/page/1column.phtml" for product pages which is the default root block template used by the template configured in the design tab of the backend). Because it isn't using the layout I specified, it dies in PHP trying to load templates that don't exist in the theme.
Any guidance is appreciated.
Note: I am not using a CMS page to test this concept since they load their own templates as specified in the backend. I created a test product and am using its product page. The test is made by requesting the following URL: http://mymagentosite.com/test-product?ajax=1
I've created a module with an observer and a very minimal layout as follows:
app
├── code
│ └── local
│ └── MyCompany
│ └── MyModule
│ ├── etc
│ │ └── config.xml
│ └── Model
│ └── Observer.php
├── design
│ └── frontend
│ └── myTheme
│ └── default
│ ├── layout
│ │ └── local.xml
│ └── template
│ └── test.phtml
└── etc
└── modules
└── MyCompany_MyModule.xml
<!-- language: lang-xml -->
<?xml version="1.0" encoding="UTF-8"?>
<config>
<modules>
<MyCompany_MyModule>
<version>0.1.0.0</version>
</MyCompany_MyModule>
</modules>
<global>
<events>
<controller_action_layout_generate_xml_before>
<observers>
<myCompany_myModule_model_observer>
<type>singleton</type>
<class>MyCompany_MyModule_Model_Observer</class>
<method>changeRequestLayout</method>
</myCompany_myModule_model_observer>
</observers>
</controller_action_layout_generate_xml_before>
</events>
</global>
</config>
<!-- language: lang-php -->
<?php
class MyCompany_MyModule_Model_Observer
{
public function changeRequestLayout($observer)
{
if ($observer->getAction()->getRequest()->isAjax()) {
Mage::getDesign()->setArea('frontend')->setPackageName('myTheme')->setTheme('default');
}
}
}
<!-- language: lang-xml -->
<?xml version="1.0" encoding="UTF-8"?>
<layout version="0.1.0.0">
<default>
<block type="page/html" name="root" output="toHtml" template="test.phtml" />
</default>
</layout>
<!-- language: lang-html -->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Testing, testing...1...2...3...</title>
<style type="text/css">
body {
background-color:#f00;
}
</style>
</head>
<body>
<h1>This is a test of the Magento layout system. This is only a test. If this were not a test, real content would follow.</h1>
</body>
</html>
<!-- language: lang-xml -->
<?xml version="1.0" encoding="UTF-8"?>
<config>
<modules>
<MyCompany_MyModule>
<active>true</active>
<codePool>local</codePool>
</MyCompany_MyModule>
</modules>
</config>
980
More specifically, in Magento 2, any module's or parent theme's layout, template, or web can be overridden with ease just by placing it in <theme_dir>/<Vendor>_<Module>/path/to/file . For instance, for the Magento_Theme module, you can place your template in <theme_dir>/Magento_Theme/templates/html/header.
This is a working solution i built that definitely does the job of switching the design package/theme via controller_front_init_before event.
Of course you could check some request params inside changeConfigNode() method with
Mage::app()->getRequest()->getParam('switch') and just append the request param switch/1 to trigger the changes.
<global>
<events>
<controller_front_init_before>
<observers>
<cartware_change_the_node>
<class>cartware_guest2customer/observer</class>
<method>changeConfigNode</method>
</cartware_change_the_node>
</observers>
</controller_front_init_before>
</events>
</global>
And the observer method:
public function changeConfigNode(){
/** left for testing
Mage::log( Mage::app()->getConfig()->getXmlString());
**/
Mage::app()->getConfig()->setNode('stores/default/design/package/name', 'enterprise');
Mage::app()->getConfig()->setNode('stores/default/design/package/theme', 'enterprise');
Mage::app()->getConfig()->setNode('stores/default/design/package/default_theme', 'enterprise');
Mage::app()->getConfig()->setNode('stores/default/design/theme/default', 'enterprise');
Mage::app()->getConfig()->setNode('stores/default/design/theme/layout', 'enterprise');
Mage::app()->getConfig()->setNode('stores/default/design/theme/template', 'enterprise');
}
Its without additional checks but it might help you! Good luck!
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