Finally, the first(?) entry into a Webware Cookbook!
Regards
Franz
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf
> Of Albert
> Brandl
> Sent: Dienstag, 11. September 2001 10:46
> To: [EMAIL PROTECTED]
> Subject: [Webware-discuss] "Forwarding" a page
>
>
> Hi!
>
> Sometimes, I'd like to "forward" a page to present the results
> of some processing. Usually, this new page does only show some
> message in the spirit of "Following data have been saved:
> [table]".
>
> One could write another page which contains just the necessary
> code, but I prefer not to clutter the directory with lots of
> servlets that have almost no functionality. Thus, I've written
> a method which allows to integrate the presentation of the
> results into the servlet.
>
> class MyPage (SidebarPage):
> # [...]
>
> def forwardPage(self, func):
> self.wfc.save()
> oldContent = self.writeContent
> self.writeContent = func
> self.writeBody()
> self.writeContent = oldContent
>
> This method takes as argument the name of a method of MyPage
> (or a subclass of MyPage). self.writeContent is temporarily
> replaced with the new method "func". When self.writeBody() is
> called, it calls "func" instead of self.writeContent. After
> this, self.writeContent is replaced with the original method.
>
> You would use this method as follows:
>
> class SomePage (MyPage):
> def writeContent(self):
> """ this routine is called when SomePage is requested
> by the user"""
>
> self.write("<form>...</form>") # with a button that links
> #to self.processData()
>
> def processData(self):
> """ this is the routine which is called when the
> user presses the submit-button"""
>
> self.result = self.doSomeProcessing()
> self.forwardPage(self.showResult)
>
> def doSomeProcessing(self):
> """ proceess the form data. Usually, this method manipulates
> some attributes of ShowPage which can be used by
> showResult,
> e.g. lists of successful / unsuccessful manipulations"""
> return 1
>
> def showResult(self):
> """ this routine is called at the end of
> self.processData()"""
>
> if self.result:
> self.write("The changes have been saved")
> else:
> self.write("Something has gone wrong")
> self.write('<a href="MainPage">Back to the main page</a>')
>
>
> This approach seems to work quite well. There is one caveat,
> though: self.forwardPage implicitly calls self.awake(). This
> might be a problem if you use self.awake() for the manipulation
> of the underlying model (e.g. add a row to a database table).
>
> What do you think about this construction?
>
> Yours,
>
> Albert Brandl
>
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