Mailman 3 September 2006 - Twisted-web

[Nevow] cookie max-age support
by Manlio Perillo 08 Sep '06

08 Sep '06

Hi. I have just discovered that IExplorer, Mozilla dand Firefox does not support max-age. At least when I set max-age to 0 the cookie is not discarded. Only Opera seems to support this. So the question: why there is a max-age support with Cookie? This is a compatible interface for the future support of the new Cookie standard (Set-Cookie2)? Thanks Manlio Perillo

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Nevow and template like files
by Nuutti Kotivuori 07 Sep '06

07 Sep '06

Hi, I'm considering the best ways to write a Nevow site that would meet my needs. I know I can come up with several solutions to my problems myself, but I am pondering on the best way to achieve them. I will first describe my needs and then give an idea how I was thinking of achieving it. I will have three classes of xhtml files, or templates, that are used in different parts of the code. First are layout pages. These will provide the general layout and functionality for a set of pages that will make up a section of the site. These pages will contain the actual html/head/body tags and such. Second are the content pages. These pages will fit in a certain layout and provide the actual page content to it. There will be static pages, dynamic status pages and pages with web forms. The layout pages need to be able to dig sections out of the content pages to fill in to the layout; for example additional css/javascript to go into head, sidebar items, actual content. Third are so called snippet pages. These will contain a large number of text snippets (with markup) that are re-used on many content pages. These snippets need to be easily includable from the content pages. Some of the snippets are used as is, where as some of the snippets need to be parameterised - the calling code needs to be able to fill in some things easily. And that's it. The way I was going to go about it was rather straightforward. Layout pages would be simply Pages, with the layout file as docFactory and a few macros defined. Content pages would inherit from layout pages, and specify the content file somehow (contentDocFactory?). The macros from layout pages would just directly use patterns from the content pages to fill in stuff. Snippet pages are a bit troublesome. I was thinking of making a Fragment that would have the docFactory for such a page. Then that fragment would be instantiated where ever some snippet was to be used, and a simple method would be called on it. This method would get the document, get a pattern from it, call fillSlots a couple times and return it. I could make a macro which does this based on the arguments it receives. But it's all a bit in the air. Things I'd like to avoid or achieve. I wouldn't want the actual xhtml templates to be read many times in the life of the program - it may even be a problem with macros if a page is read once per every pattern used from it - so I'd like for them to be read just once. I'd like a way to have some patterns be optional, so I could provide a default thing to do in case they are not found. And I'd like the lookup of the snippet patterns be somehow pre-done, so that every inclusion of a snippet wouldn't have go to through 1000 DOM nodes to find the right part. So, any suggestions on how to actually go about making this happen? -- Naked

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Formal and tabbed pane
by Nuutti Kotivuori 05 Sep '06

05 Sep '06

Another thing I'd like to get working is combining formal with tabbed pane. What I'd like to get is a formal form shown as a tabbed pane, with either each group represented as page in the tabbed pane, or some other grouping method used to determine which fields belong to which pane. But I'd still like it to have just one submit button that would submit all the fields in all the panes. And, somehow, I'd like it gracefully to degrade to a normal formal grouped form if Javascript isn't available :-) But, I'll take what I can get and hack the rest somehow. -- Naked

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Athena DOM manipulation
by Phil Mayers 05 Sep '06

05 Sep '06

Is it possible for an athena LivePage to add new LiveElements? To remove them? The application is a web-based database editor which due to operational requirements has suddenly had a ballooning in the number of fields per HTML page, and the round-tripping of the form submits plus rendering of the extremely large HTML in one large block is actually now causing operational difficulties. Something like: +-(main)-------------------+ | field1: ______ | | field2: ______ | | checkbox: [__] | | | +-(subitems)---------------+ | key | name | dom | | +-----+------+-----+-------+ | | | | [del] | << this is a 3-textbox row for each subitem +-----+------+-----+-------+ | [Add new subitem?] | << this is a +--------------------------+ ...with maybe ~60 and climbing rows of subitems. I can handle the initial loading of the page taking a bit of time, but a user might want to add, change or delete ~10-25 rows of subitems each time they visit the page, and the round-tripping is genuinely detrimental. Can you do something like returning a LiveElement from a callRemote? Or can you somehow create (in a supported fashion) a server-side LiveElement, return the ID/html/whatever from the callRemote'ed method, and then run the client-side widget creation JavaScript, supplying the ID? Is this just plain a bad idea? Should I somehow make the entire list of subitems a single widget (less attractive, because the in-built client and server-side demuxing of the LiveElement -> row is attractive)

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simple proxy example?
by Wendell Turner 05 Sep '06

05 Sep '06

The webdownload.py script in Abe Fettig's book works fine for directly connected machines. I would like to modify it to use a proxy. Most of the examples in the twisted docs seem to show how to write a proxy, not how to use one. To modify that example to use a proxy, do I need to use a ProxyClientFactory instead of the HTTPDownloader? I tried that, but it needs 7 arguments, and I could not tell what they should be. Or do I just set the factory.protocol to proxy.Proxy? If so, where do I tell it the proxy's address & port? Is there a (simple(!)) twisted web page retrieval script that uses (i.e. runs behind) a proxy server that I could use to start with? Thanks, Wendell

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athena under a vhost: strange issue
by aleuser＠inwind.it 05 Sep '06

05 Sep '06

Hi, I think I have found a strange issue in athena under a virtual host. The problem is the 'self.callRemote' server side functions; they will work only the first time, after that (I mean: after one only 'self.callRemote' is executed) the athena page seems to be disconnected and no other dinamic athena function seems to be working! If I use the same page without the virtual host (browsing directly to the athena web server ) it works ok. The problem seem to be the deferred returned by the server side 'self.callRemote'. If I don't return it, it will not be executed under a virtual host. No errors are reported in the debug athena window and in the firefox javascript console. In the following examples, the 'msgbox' is an 'alert' client-side in the "liveform.js" file. ... function msgbox(self, msg){ alert(msg); return false; }, .. Here the code: class LiveFormExampleFragment(athena.LiveFragment): jsClass = u"LiveForm.Checkin" docFactory = loaders.stan(T.span(render=T.directive('liveFragment'))[ 'TestInput= ', T.input(type="text", onchange="Nevow.Athena.Widget.get(this).callRemote('testing', this.value);"), 'TestInput 2 = ', T.input(type="text", onchange=""" ret = Nevow.Athena.Widget.get(this).callRemote('testing2', this.value); ret.addCallback(function(arg){ alert(arg); }) """), ]) def testing2(self, val): aa = self.callRemote('msgbox', u'message1..') bb = self.callRemote('msgbox', u'...message2') print "I always print val = ", val #Under a vhost I cant do a simple """ return 'Finish : %s'%val """ because # it will work only the first time! after that, nothing will work.. return DeferredList([aa, bb]).addCallback(lambda _: u'Finish : %s'%val) athena.expose(testing2) def testing(self, val): aa = self.callRemote('msgbox', u'message1..') bb = self.callRemote('msgbox', u'...message2') print "I always print val = ", val #if I remove the next 'return DeferredList' the message1 & 2 will be printed on the # screen only the first time! after that, nothing will work.. return DeferredList([aa, bb]) #<<< so don't remove me! athena.expose(testing) class LiveFormExample(athena.LivePage): docFactory = loaders.stan([ T.html[T.body[ T.invisible(render=T.directive('liveglue')), T.invisible(render=T.directive("form")), ]]]) def __init__(self, *a, **kw): athena.LivePage.__init__(self, *a, **kw) self.jsModules.mapping[u'LiveForm'] = './liveform.js' def render_form(self, ctx, data): c = LiveFormExampleFragment() c.page = self return ctx.tag[c] Alessandro

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[Release] Bic A1A1
by Adrian Perez 01 Sep '06

01 Sep '06

Hello! As I mentioned earlier, I'm writing a weblog system using Nevow, and now I'm proud of announcing the availability of the first «official» alpha release, version A1A1. You can grab it here: - TGZ: http://code.connectical.net/nn-releases/bic/bic-A1A1.tar.gz - Combined TGZ, recommended (Bic A1A1, Pyramid A0A15, Formal 255-svn): http://code.connectical.net/nn-releases/pyramid+bic+formal-20060824.tar.gz (If you don't have Pyramid and/or Formal, and don't want to have extrawork downloading and installing them, I recommend using the second package.) As I stated in my previous message, any comments regarding the thing will be appreciated. I know there are some bugs, and that a lot of features are still missing but... it's alpha! :-P. Even so, I'm very happy with the result. Once installed somewhere in your $PYTHONPATH, make it work as follows: $ mkdir /tmp/bic $ cp bic.{tac,conf} /tmp/bic $ cd /tmp/bic && twistd -noy bic.tac Then point a web browser to http://localhost:3979 (administration at http://localhost:3979/login). By default, username and password are both «admin» (without the quotes). You can tune authentication by editing «bic.conf»: $ echo 'auth_plugin = passwd' >> bic.conf $ echo 'auth_params = filename:bic.passwd' >> bic.conf $ echo 'iamcool:mypassiscool' >> bic.passwd $ echo 'sheiscool:herpassiscool' >> bic.passwd Here you have a screenshot with someone logged in, with the default theme and english localization: http://img391.imageshack.us/img391/5949/bicadminencl9.jpg Finally, I would like to thank the one who pointed about using formal instead of formless, because I found formal to be somewhat nicer than the other one ;-) Also, the recent thread regarding nevow.guard was useful because it helped me understand how does it work, so I was able of using nevow.guard to add authentication. Cheers, P.S: If this list is not suitable for announcements like this, just let me know, I don't want to be unpolite ;-) -- Adrian Perez "Experience is what you get when you don't get what you want" -- (Dan Stanford)

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