This very simple extension allows you to offer a cache-friendly mobile version of your radiant site.

1. Any request to a host whose address begins 'm.' is considered to be a request for the mobile site. If you want to use a different address, put its hostname in 'mobile.host'. You can do that through the admin settings interface.

2. Set 'mobile.redirect?' to true and put the full hostname in 'mobile.hostname' if you want to bounce iphone and other mobile users to your mobile site when they first arrive.

3. Provide a link back to your main site by appending ?nomobile. We will skip the redirect on that request and set a session flag that will carry on blocking it for future requests.

4. Use the radius tags <r:if_mobile_> and <r:unless_mobile> to make layout or content decisions based on whether this is a request for the mobile site.

• Because radiant renders pages within the model, using layouts chosen by association. The rails layout is always the same and there is no show-page template in the usual sense.

• We can give visitors more control this way.
• We can't deliver variant pages through the cache: different versions of the same page must have different addresses.

It's up to you how broadly the mobile context affects your site delivery. Here are some likely scenarios:

<r:unless_mobile>
  <r:content part="sidebar" />
<r:unless_mobile>

<r:if_mobile>
  <r:stylesheet slug="mobile.css" as="link" />
</r:if_mobile>
<r:unless_mobile>
  <r:stylesheet slug="standard.css" as="link" />
<r:unless_mobile>

<r:if_mobile>
  <r:content part="iphone" />
</r:if_mobile>
<r:unless_mobile>
  <r:content />
<r:unless_mobile>

<r:if_mobile>
  <r:snippet name="mobile_masthead" />
</r:if_mobile>
<r:unless_mobile>
  <r:snippet name="standard_masthead" />
</r:unless_mobile>

With the layouts or nested_layouts extension you could create a simple layout-chooser layout. I haven't tried it, but this ought to work:

<r:if_mobile>
  <r:inside_layout name="Mobile">
    <r:content_for_layout />
  </r:inside_layout>
</r:if_mobile>
<r:unless_mobile>
  <r:inside_layout name="Standard">
  	<r:content_for_layout />
  </r:inside_layout>
</r:unless_mobile>

Brand new and not well tested, but there's not much to it.

Github issues, please, or write to Will.

• Copyright spanner ltd 2010.
• Released under the same terms as Rails and/or Radiant.
• Contact will at spanner.org