collective.themefragments 0.9.0

Fragment templates

Fragments are Zope Page Template files bundled with your theme. You can create them by adding a folder called fragments to your theme resource directory (i.e. the directory containing rules.xml), either through the web or on the filesystem, and creating one or more files with a .pt extension in this directory.

For example, you could create a file fragments/customnav.pt in your theme directory, containing:

<ul id="nav">
  <li tal:repeat="item context/@@folderListing">
    <img tal:replace="structure item/getIcon" />
    <span tal:replace="item/Title" tal:attributes="titile item/Description">Title</span>
  </li>
</ul>

This uses Zope Page Template TAL syntax (the same syntax you might use to create a template for a browser view if you are doing filesystem Python development, say) to generate some markup based on the attributes and helper views available relative to the current context.

The following variables are available to the page template used to build a fragment:

context

The context in which the fragment was looked up. This is usually either the portal root (when using an href with an absolute path, i.e. one starting with a /) or the current content object (when using an href with a relative path).

request

The request used to render the fragment. When using a fragment from the href of a rule, this is a clone of the request used to render the page, but with the path to the fragment view, not the original content object. Note that form parameters from the original request are not available in this request.

portal

The portal root object.

portal_url

The URL to the portal root.

You can learn more about Zope Page Template syntax here.

Rendering fragments

The special @@theme-fragment view is used to render fragments. Before using it in your theme, you can test it directlry in your browser by going to a URL like:

http://localhost:8080/Plone/@@theme-fragment/customnav

This will cause the fragment in fragments/customnav.pt to be rendered with the Plone site Plone running on localhost:8080 as its context. You can render fragments relative to any content object, by adjusting the URL.

Note: Fragments are only available for the currently active theme. When testing a fragment in the browser in this way, make sure the theme is enabled!

To use a fragment in a theme rule, use the href attribute with either an absolute or relative path. For example:

<replace css:theme="#navlist" css:content="#nav" href="/@@theme-fragment/customnav" />

will replace the element with id navlist in the theme with the element with id nav in the fragment generated by the fragments/customnav.pt template in the theme, rendered with the portal root as its context always (since the href is using an absolute path, i.e. one beginning with a /).

Similarly:

<replace css:theme="#navlist" css:content="#nav" href="@@theme-fragment/customnav" />

will do the same, but using the current content item as its context (i.e. the href is using a relative path).

Fragment security

Fragments, like theme HTML mockup files, are publicly accessible. Anyone with access to the site can construct a URL containing @@theme-fragment/<name> to render a given fragment.

However, the page templates used to build fragments execute in a so-called Restricted Python environment. This means that the are executed as the current user (or Anonymous, if the current user is not logged in). Information (such as content items or their attributes) not accessible to the current user cannot be rendered, and may result in a 403 Forbidden error when rendering the fragment.