Problem with JFactory::getDocument() when module is placed in {loadposition}

Question

I got stuck. I'm coding a simple module which will be placed/visible only on com_content article pages. This module fetches keywords from the current article, and to avoid an additional database query I use JDocument/getMetaData:

$item = JFactory::getDocument();
$item_keywords = $item->getMetaData('keywords');

This code works well when the module is placed in regular module position and I'm able to get the list of keywords:

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But when I inserted the module in article content through the {loadposition} plugin, I found out that the module cannot retrieve keywords from the current article using JDocument/getMetaData.

Is there any solution how I can retrieve article keywords in the module without additional database query?

Probably I'll add a a code that checks how the module is loaded. My code:

$item = JFactory::getDocument();
if ($item->template) {
    echo "standart module load - use getMetaData";
} else {
    echo "module loaded by plugin - create an additional query";
}

Do you have a better idea?

Answer 1

You can't use standard Joomla {loadposition} content plugin for this purpose because content preparation occurs much before head data preparations.

You will need to write your own Joomla System plugin for the replacement like NoNumber's Module Anywhere plugin which replaces the mos code with the module after head data preparation. To learn more refer to the list of Joomla Plugin events: https://docs.joomla.org/Plugin/Events

Answer 2

It's probably easiest to fetch the keywords manually with sql from your module. Something like (if view=article):

$app=JFactory::getApplication(); 
$id = $app->input->getInt('id', 0); 
$db=JFactory::getDbo(); 
$db->setQuery("select metakey from #__content where id={$id}");
$keywords=$db->loadResult();