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    <p>It looks like you're using the wrong layout handle, although it's easy to see why folks would get tripped up by this. </p> <p>If I <a href="http://store.pulsestorm.net/products/commerce-bug-2" rel="nofollow noreferrer">use Commerce Bug to view the layout handles</a> (self link, Commerce Bug is the commercial debugging extension I created and sell) for that page, I see the following</p> <p><img src="https://i.stack.imgur.com/IE1ok.png" alt="enter image description here"></p> <p>So that's <code>admin_catalog_category_edit</code> instead of <code>admin_catalog_category_index</code>.</p> <p>Why <code>edit</code> instead of <code>index</code>? If I use <a href="http://store.pulsestorm.net/products/commerce-bug-2" rel="nofollow noreferrer">Commerce Bug's</a> Request tab to find the controller file</p> <p><img src="https://i.stack.imgur.com/Th6nE.png" alt="enter image description here"></p> <p>and then look at the index action method.</p> <pre><code>#File: app/code/core/Mage/Adminhtml/controllers/Catalog/CategoryController.php public function indexAction() { $this-&gt;_forward('edit'); } </code></pre> <p>Ah ha! The <code>indexAction</code> method forwards to the <code>edit</code> action. When you forward a request in Magento, you're saying</p> <blockquote> <p>Hey Magento, let's pretend the request used <strong>this</strong> action method instead of the actual action method, <strong>without</strong> doing an HTTP redirect.</p> </blockquote> <p>Assuming your Layout XML is in the correct file, change your <code>admin_catalog_category_index</code> handle to <code>admin_catalog_category_edit</code> and you'll be good to go. </p> <p><strong>Update</strong>: Assuming, of course, you don't want to update the content block.<br> The other problem with the category editing page is, when the page load it replaces its content area with an AJAX request. When I added the following to <code>local.xml</code></p> <pre><code>&lt;layout&gt; &lt;admin_catalog_category_index&gt; &lt;reference name="content"&gt; &lt;!-- &lt;block type="categorysearch/adminhtml_categorysearch_search" name="categorysearch" /&gt; --&gt; &lt;block type="core/text" name="WednesdayApril32013"&gt; &lt;action method="setText"&gt; &lt;text&gt;This is a test&lt;/text&gt; &lt;/action&gt; &lt;/block&gt; &lt;/reference&gt; &lt;/admin_catalog_category_index&gt; &lt;/layout&gt; </code></pre> <p>The text "This is a test" was rendered in the page source (<code>View -&gt; Developer -&gt; View Source</code> in Chrome). However, Magento immediately makes a background ajax request to a URL something like this</p> <pre><code>http://store.example.com/index.php/admin/catalog_category/edit/key/c184cfd77dcf298659d1cb3a31c51852/section/general/?isAjax=true </code></pre> <p>and replaces the content section. If we take another look at the controller</p> <pre><code> #File: app/code/core/Mage/Adminhtml/controllers/Catalog/CategoryController.php if ($this-&gt;getRequest()-&gt;getQuery('isAjax')) { // prepare breadcrumbs of selected category, if any $breadcrumbsPath = $category-&gt;getPath(); if (empty($breadcrumbsPath)) { // but if no category, and it is deleted - prepare breadcrumbs from path, saved in session $breadcrumbsPath = Mage::getSingleton('admin/session')-&gt;getDeletedPath(true); if (!empty($breadcrumbsPath)) { $breadcrumbsPath = explode('/', $breadcrumbsPath); // no need to get parent breadcrumbs if deleting category level 1 if (count($breadcrumbsPath) &lt;= 1) { $breadcrumbsPath = ''; } else { array_pop($breadcrumbsPath); $breadcrumbsPath = implode('/', $breadcrumbsPath); } } } Mage::getSingleton('admin/session') -&gt;setLastViewedStore($this-&gt;getRequest()-&gt;getParam('store')); Mage::getSingleton('admin/session') -&gt;setLastEditedCategory($category-&gt;getId()); // $this-&gt;_initLayoutMessages('adminhtml/session'); $this-&gt;loadLayout(); $eventResponse = new Varien_Object(array( 'content' =&gt; $this-&gt;getLayout()-&gt;getBlock('category.edit')-&gt;getFormHtml() . $this-&gt;getLayout()-&gt;getBlock('category.tree') -&gt;getBreadcrumbsJavascript($breadcrumbsPath, 'editingCategoryBreadcrumbs'), 'messages' =&gt; $this-&gt;getLayout()-&gt;getMessagesBlock()-&gt;getGroupedHtml(), )); Mage::dispatchEvent('category_prepare_ajax_response', array( 'response' =&gt; $eventResponse, 'controller' =&gt; $this )); $this-&gt;getResponse()-&gt;setBody( Mage::helper('core')-&gt;jsonEncode($eventResponse-&gt;getData()) ); return; } </code></pre> <p>We can this this ajax request is handled outside of the normal layout rendering flow.</p> <p>So, with this additional knowledge, I'd create an event listener for <code>category_prepare_ajax_response</code>, and then add your content to the response object that's passed in</p>
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    1. POMageneto catalog categories layout xml handle?
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    1. COHi Alan Storm, Let me start by saying thank you so much for replying to this post. I've purchased and read your book "No Frills Magento Layout" and it was awesome. I feel like a rock star having you answer one of my questions lol :p.
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    2. COSorry for the two comments, accidentally hit "enter" early. Commerce bug looks like a pretty awesome piece of software, I'll have to check it out. As far as the solution goes, I actually did try grabbing onto the handle "<admin_catalog_category_edit>" but the block still isn't being added (I know my Layout update file is being loaded however because other handles are working). I'm going to dig a little deeper into this, but thank you for the response, I think I'm on the right track.
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    3. CO@EmilStewart I've updated my answer — it looks like the category edit page immediately replaces the content area via ajax. Full explanation and some suggestions above.
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