Override libraries

[Alex de Borba]

Hello to you all!

I need to override libraries/joomla/document/html/renderer/head.php in Joomla 3.3.4 but haven't found any online article that actually helps me with it.

Any tips?

Thanks in advance.

[Michael Babker]

Why do you need to override a core file?

You can overload it with a system plugin at the onAfterInitialise event, but I'd suggest avoiding that at all costs as it essentially equates to hacking core by pointing an installation to a custom version of the class versus the one distributed with the package.

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[Dimitris]

I made a P/R few weeks ago that will allow you to do that without a plugin.

Please read all about the proposal here

https://github.com/joomla/joomla-cms/pull/4074

And if you can make a test will be excellent as this is a prerequisite in order to have the code in the core.

[Sven Versteegen]

If you want to override a renderer or create new ones just load the file, there is no plugin needed, the document checks if the renderer class is included, if not it trys to load it.
A simple require_once in your template is enough.

[Sven Versteegen]

Checked your pull request, overriding html.php just to override a renderer is overkill in my eyes, like I wrote before just include your renderer and it will be used, this is possible since J!1.5.

[Dimitris]

Yes that will work also:

require_once(‘my_new_header.php’);

and then call it like:

< jdoc:include type=“my_new_header” / >

[Dimitris]

But is not really overkill to override html and just the renderers you need. And you can  do some pretty nice things there like minify the html document, minify js css and concatenate all js and css. Also set all the magic metas for Facebook twitter g+ etc. At the end if you know what you are doing you gain in speed and efficiency without the need for a bunch of plugins. Maybe I’ll post my core template scaffold so everybody can see the benefits of having enough flexibility by overriding the standard core renderer folder.

[Sven Versteegen]

When I read your test instructions "copy the folder html from /libraries/joomla/document to protostar/document", what is the coplete Document package, it sounds to me like overkill for just overriding a renderer, sry.
Why should I copy all when all I need is the renderer class?
Maybe you get my message wrong, my english is pretty bad sorry. Also you don't need to post your core template, at least not for me, I override the head renderer since 1.5 for doing things you mentioned.
Your above example would be a new renderer, right, but you also can override the existing ones that way, again, the document class first checks if these renderer classes are already there, if they are not the core one is loaded.
So all you have to do is to create one file "renderer_head.php" (put where ever you want) and in that file define the class from the core head renderer "class JDocumentRendererHead extends JDocumentRenderer" and then include it in your template and you're done.

[Sven Versteegen]

Only the html folder is of course not the complete document package... nearly 4am here sry

[Dimitris]

Yes that copy the document folder is oversimplified and obviously is not needed. 

What you are writing above are all correct but there is a but. Without this code you cannot override the file e.g.: library/document/html/html.php so you have only the renderers/whatever.php. By applying this patch you have ALL the rendering procedure available to modify it at your own will WITHOUT using a plugin. 

For example I don’t use the jdoc:include shortcut and therefore no prey_match and preg_replace is needed and also I do a minification of the output, and these cannot be done without a plugin...

[Sergio Manzi]

Dimitris,

I'd really like to give a look at your code: it sounds really interesting to me...

Is it on GitHub?

Thanks!

Sergio

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[Dimitris]

I will try to get something in github next week, as this one I am going out of town for business. I'll post a link here.

[Sergio Manzi]

Great, thanks!