Modify contents of head from body

Question

I successfully retrieved a URL of the next catalog page from catalog pager block (Mage_Page_Block_Html_Pager).
Now I'm trying to add this URL to the head block (e.g. <link rel="next" url="url-to-next-page" />).

-

public function core_block_abstract_to_html_before(Varien_Event_Observer $observer) {

  $block = $observer->getBlock();

  // Check if current block is pager block
  if($block instanceof Mage_Page_Block_Html_Pager) {
    // I'm getting head block
    $head_block = $Mage::app()->getLayout()->getBlock('head');

    // Trying to add  <link rel="next" url="path-to-next-page" /> to head
    // $block->getNextPageUrl() prints correct value
    // But nothing is added to head
    $head_block->addLinkRel( 'next', $block->getNextPageUrl() );
  }

}

Is it possible at least, or I'm doing this in wrong way?

Fabian Blechschmidt · Answer 1 · 2013-05-25T10:27:07.360

3

I think the problem is, that the Mage_Page_Block_Html_Head is already renderer, when you iterate ober the Mage_Page_Block_Html_Pager.

You can do it the other way around. Check for instanceof Mage_Page_Block_Html_Head get the pager from the layout and get insert the link.

To get the pager-block in the category view, have a look into the catalog.xml:

<block type="page/html_pager" name="product_list_toolbar_pager"/>

So to get the block:

Mage::app()->getLayout()->getBlock('product_list_toolbar_pager');

And because I just saw it, do you really typed $Mage in your code? And this worked? It should be Mage::

edited May 25 '13 at 10:27

answered May 24 '13 at 13:48

Fabian Blechschmidt

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Thanks you as always. I've tried this, but getBlock('page/html_pager') returns false in head. Here is code https://gist.github.com/anonymous/139e7e76343285f621e5 – Marvin3 May 24 '13 at 14:41
Am I missing something? – Marvin3 May 24 '13 at 14:50
Then the block is created later by the product list, maybe. I have no spontanous idea. Maybe tomorrow – Fabian Blechschmidt May 24 '13 at 22:28
updated the answer. – Fabian Blechschmidt May 25 '13 at 10:27
Thank you, I tried that too, now it returns the block but all data in it is null. Probably because it hasn't been initialized yet. It looks like it's impossible to move data from body to head, so I used createBlock instead of getBlock. – Marvin3 May 26 '13 at 12:39

Modify contents of head from body

1 Answers1