TAL here hack in Plone

28^th of April 2005

Had to do a very useful and ugly but also smart hack in Plone today.

In the portal root I have a Document with Id index_html that the client is changing with the WYSIWYG editor. What I wanted to do was to change some METAL calls in the <head> tag of that one document. In fact, what I wanted to do was to cover up the left hand column which is done this way:

The problem was that the index_html Document is a Document so I can't edit it's TAL. I could have customized document_view.pt but that would have applied for all Document objects in the site. Here's how I solved it:

I renamed index_html to index_html_content and created a Page Template object in the portal root. The code for this one I got from portal_skins/plone_content/document_view.pt. Then I added the metal:override as shown above.

But I wanted this new index_html to render the content of the index_html_content object so that in, index_html I can (continue to) do stuff like here/getBody and here/Title. So what did I do? Here's a cut down copy of the index_html code:

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"
      lang="en"
      metal:use-macro="here/main_template/macros/master"
      i18n:domain="plone">
  <head>
        <metal:override fill-slot="column_one_slot" />
  </head>
  <body>
  <metal:main fill-slot="main">
    
    <tal:hack define="here nocall:here/index_html_content">
      <tal:main-macro metal:define-macro="main"
           tal:define="len_text python:len(here.text);">
        <h1 tal:content="here/title_or_id" class="documentFirstHeading">
          Title or id
        </h1>
        [... stuff hidden ...]
      </tal:main-macro>
    </tal:hack>
  </metal:main>
  </body>
  </html>

That didn't hurt, did it?

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