z3c.resourceinclude 0.3

Machinery to include web resources based on request layer.

Overview

The package is able to include the following types of resources:

• Cascading stylesheets (.css)

• Kinetic stylesheets (.kss)

• Javascript (.js)

Usage

The package operates with browser resources, registered individually or using the resource directory factory.

A simple example:

<configure xmlns="http://namespaces.zope.org/zope"
          xmlns:browser="http://namespaces.zope.org/browser">

  <include package="z3c.resourceinclude" file="meta.zcml" />
  <include package="z3c.resourceinclude" />

  <browser:resource name="example.css" file="example.css" />

  <browser:resourceInclude
       layer="zope.publisher.interfaces.browser.IDefaultBrowserLayer"
       include="example.css"
   />

</configure>

This registration means that whenever the request provides IDefaultBrowserLayer the resource named ‘example.css’ will be included on the page.

To render HTML snippets that include applicable resources, a content provider is provided, see z3c/resourceinclude/provide.py. You may also use one of the viewlets:

<browser:viewlet
   name="resourceinclude"
   class="z3c.resourceinclude.viewlets.CacheOneHourViewlet"
   permission="zope.View" />

A convenience method is provided to require a given resource layer:

>>> from z3c.resourceinclude import include
>>> include(IMyLayer)

Ordering

Resources are included in the order they’re registered; that is, the order in which the ZCML-directives are processed.

Stylesheets are included before javascripts as per general recommendation. Kinetic stylesheets are included last.

Merging

When not in ‘devmode’, the resource collector will automatically merge resources, giving them a filename based on the contents (sha digest). This has the side effect that merged resources are set to never expire.