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2013-02-14T17:31:57.680
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The XML based structure of Magento seems bit confusing and annoying at the beginning but its well-known that eventually strong capability and customizability… <pre><code><adminhtml_example_index></adminhtml_example_index> </code></pre> This tag refers to the [router][controller][action] The router is the uniquely identified name for a particular dispatch. From the example you’ve given, under the admin tag of the config.xml file, we can find the router name <code>adminhtml</code>. <pre><code><admin> <routers> <adminhtml> <args> <modules> <awesome before="Mage_Adminhtml">Super_Awesome_Adminhtml</awesome> </modules> </args> </adminhtml> </routers> </admin> </code></pre> Under that router are the module settings related to this router. So if the url contains /admin/example/[index], magento will find the correct router which is <code><adminhtml></code> then will find the controller named <code>example</code> and find the correct action which is in this case <code>index</code> (/admin/example/ will be dispatched to the default index action) <pre><code><adminhtml_example_index> <reference name="content"> <block type="awesome/adminhtml_example" name="example" /> </reference> </adminhtml_example_index> </code></pre> In the layout file, for router controller action combinations, layout updates are defined. In here the update will be applied to the main block named as <code>content</code> which holds the page content section. <code><block></code> tag is used to define the block we need to refer. <code><type></code> tag is important. It refers to the correct block class that should be used when rendering this layout (Remember in Magento’s MVC structure the View consists of both Block classes and phtml files) In <code>awesome/adminhtml_example</code> here, <code>awesome</code> is the block configuration name mentioned in config.xml file. <code>adminhtml_example</code> is the block class to be used. See <pre><code><global> ----- <blocks> <awesome> <class>Super_Awesome_Block</class> </awesome> </blocks> </global> </code></pre> Under the <code>block</code> tag, a unique block name is defined (good naming convention will preserve the uniqueness). Then the class path for these block can be identified as <code>Super/Awsome/Block/</code>. Block configuration name is now resolved. <code>adminhtml_example</code> is the exact block class to be used. Any underscore after block name (awesome) will be converted to directory separator. According to that, the full path of the block class will be <pre><code>[codepool]/Super/Awsome/Block/Adminhtml/Example.php </code></pre> The class name will be like <pre><code>class Super_Awesome_Block_Adminhtml_Example extends …. </code></pre> If we have the layout file we can specify it here.. then that <code>.phtml</code> file will be rendered using the above block class <pre><code><reference name="root"> <block type="page/html" name="root" template="simplepage.phtml" /> </reference> </code></pre> Hope this helps.. Sorry if anything is unclear…
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1. POUnderstanding Magento layout xml file (reference, block, ...)
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1. COThe explanation is superb. Keep it up. :)
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