[Twisted-web] nevow HTML based template fragment problem

[Matt Goodall]

On Fri, 2004-08-13 at 10:42, Tazzo wrote:
> How can I insert a html rendered template inside another
> html rendered template?
> I mean, I have a rend.Page class with a docFactory that load
> a template (ex: page.html) with a header tag to renderize.
> The problem is that the header tag must be loaded from another
> rend.Page class who have is docFactory template (ex: header.html)
> to renderize, before send it. 
> How can I use the header rend.Page class from a render method in
> another rend.Page class?

Short answer ...

Return the header rend.Page from the page's render method.

Long answer ...

Assuming the header contains dynamic content then your header's class
should really extend rend.Fragment:

    class Header(rend.Fragment):
        def render_something(self, ctx, data):
            return something
        docFactory = loaders.xmlfile('header.html')

    class Page(rend.Page):
        def render_header(self, ctx, data):
            return Header()
        docFactory = loaders.xmlfile('page.html')

But, if the header is completely static then you can just return a
loader:

    class Page(rend.Page):
        def render_header(self, ctx, data):
            return loaders.xmlfile('header.html')
        docFactory = loaders.xmlfile('page.html')

Note: there's not actually a whole lot of difference between Fragment
and Page in this scenario but a fragment is conceptually cleaner.

Hope this helps.

Cheers, Matt

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