How can I use Joomla oncontentprepare in category blog

Question

I created a custom Joomla plugin and I want to display my custom data on content in category blog. I use oncontentprepare event for display data. But in category blog only show all data on first article. My sample code this is:

   public function oncontentprepare ($context , &$article , &$params , $page=0)
    {

   $attribs = json_decode($article->attribs);
   echo $attribs->customData;


  }

when echo my data only show on first article in category blog. I want display data by using my plugin and without use template overwrite or regular expression.
How can do it? it's possible? thank you

Answer 1

Yes, it is very possible to do what you want. Joomla provides a series of triggers for content rendering which allows a developer to append content. You have three trigger which are relevant to your use case:

onContentAfterTitle
onContentBeforeDisplay
onContentAfterDisplay

Each of these methods reference a point in the content rendering cycle you can insert HTML to be incorporated into the final rendering. We'll use onContentBeforeDisplay as an example.

public function onContentBeforeDisplay($context, &$row, &$params, $page=0) {

    // You must verify you are appending to correct component view
    if (!in_array($context, array('com_content.category')))
    {
        return true;
    }

    $html = "<span>My Appended Content!</span>"
    return $html;
}

Simple as that, but be sure to verify you are in the correct component view before appending. You can also insert into multiple components and component views if needed.

Hope this helps!

Content Plugin Events