[Twisted-web] livepage breaks after reload

[Matt Goodall]

On Wed, 2005-01-26 at 16:37 +0100, noema wrote:
> Ahh this is killing me!
> Part of the problem that I described earlier in this thread is that 
> simply adding a locateChild stops javascript events from triggering the 
> connected python function/methode.
> 
> I am trying to render the same page no matter what url (past the domain) 
>   is given. This single page should render differently depending on the 
> url, though. So in locateChild I store the url segments and return self 
> and an empty segment tuple. This seems to work but, as I said, breaks 
> the livepage functionality.
> 
> WHY is locateChild DOING thaaAAt????

It's because you're not allowing the subclass to have a go at locating
the child and so the 'link' and 'glue' child resource cannot be found.
See below.

You're locate child should look something more like ...

def locateChild(self, context, segments):

    # Do whatever you need to do here, probably returning
    # a resource and the remaining segments.

    # I don't know what it is so let Page (my subclass) try.
    return rend.Page.locateChild(self, context, segments)

> 
> What follows is some code that illustrates exactly that. Javascript 
> events come perfectly through until I uncommend the localChild methode.
> 
> #noema
> 
> 
> 
> #################### START OF .TAC FILE ########################
> 
> import random
> from twisted.application import service, internet
> from nevow import loaders, rend, tags, livepage, url
> 
> 
> class MyPage(rend.Page):
>      addSlash = True
> 
>      #def locateChild(self, context, segments):
>      #    #store the rest of the url for any kind of manual processing
>      #    self.postpath = segments
>      #    return self, ()
> 
>      def onLinkAction(self, client):
>          client.set('atag',
>              random.choice(('one', 'two', 'three', 'four', 'five')))
> 
>      def render_link(self, context, data):
>          return tags.a(onclick=livepage.handler(self.onLinkAction),
>                      href=url.here, id="atag")['click!']
> 
> 
>      def render_glue(self, context, data):
>          return livepage.glue
> 
> 
>      docFactory = loaders.stan(
>      tags.html[
>          tags.head[
>              tags.title["mypage"],
>            ],
>          tags.body[
>              tags.div[
>                  render_link
>              ],
>              tags.span(render=render_glue)
>          ]
>      ])
> 
> 
> 
> application = service.Application('mypage')
> internet.TCPServer(8080, livepage.LiveSite(MyPage()))\
>      .setServiceParent(application)
> 
> 
> #################### END OF .TAC FILE ##########################
> 
> 
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-- 
     __
    /  \__     Matt Goodall, Pollenation Internet Ltd
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