[Twisted-web] livepage breaks after reload

[noema]

Thanx a lot Matt! Your suggestion was close enough.
In case somebody else is interested. This is what finally did the trick 
for me:


     def locateChild(self, ctx, segments):
         r = rend.Page.locateChild(self, ctx, segments[-1:])
         if r is not rend.NotFound:
             return r

         return self, segments[1:]



#noema




Matt Goodall wrote:
> On Wed, 2005-01-26 at 19:29 +0100, noema wrote:
> 
>>>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)
>>
>>
>>I am not sure I fully understand what you mean. Am I not exactly doing 
>>what you are suggesting?!  I return a resource and the remaining 
>>segments. Just that in my case the resource is the current resource 
>>itself and the remaining segments are empty. (to make any child valid 
>>and be handled by MyPage (which it does just not with livepage support))
> 
> 
> Oops, my reasoning was completely flawed although I'm still confident
> I'm correct about the problem.
> 
> Liveevil connects to the nevow_liveOutput and nevow_liveInput child
> resources (see rend.LiveEvilChildMixin). By overriding locateChild, and
> not allowing the super class to play, you are blocking access to those
> liveevil resources.
> 
> 
>> > return rend.Page.locateChild(self, context, segments)
>>
>>Isn't this returned/called anyways if I wouldn't overwrite the inherited 
>>locateChild methode.
> 
> 
> Yes, *if* you don't override locateChild. But in your code, the problem
> occurs once you uncomment locateChild and replace rend.Page's
> implementation of locateChild.
> 
> If you want to handle all segments but still let Liveevil work, perhaps
> the following will help:
> 
>         def locateChild(self, ctx, segments):
>             r = rend.Page(self, ctx, segments)
>             if r is not appserver.NotFound:
>                 return r
>             return self, ()
>         
> That /should/ let the super class locate the resources needed by
> liveevil and make your page handle all other segments.
> 
> Hope this makes more sense this time ;-).
> 
> Cheers, Matt
> 
> 
>>
>>
>>>>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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> 
> 
> 
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