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Collects and presents status messages. NotifyComponent should
be used in your class definitions.
Adds two methods, ``message(msg)`` and ``writeMessages(prefix,
postfix)``.
``message(msg)`` adds a message to be presented to the user.
These messages are simply queued in the session.
``writeMessages(prefix, postfix)`` writes the messages that
have been collected, and empties the queue. You might want
to define:
class SitePage(CPage):
components = [NotifyComponent()]
def writeBodyParts(self):
self.writeMessages()
CPage.writeBodyParts(self)
prefix and postfix are used to surround the messages, if there
are any messages. By default it's put in a box. Typically
you'd use it like:
class SomePage(SitePage):
def awake(self, trans):
CPage.awake(self, trans)
if self.request().field('setSomething', 0):
# do stuff...
self.message('Stuff done successfully')
raise HTTPRedirect, 'StuffIndex'
def writeContent(self):
self.write('form for doing stuff...')
Be careful; if you redirect *after* you call ``writeMessages``,
the messages will be removed from the queue, but the user will
probably never see them. For this reason, all redirects should
happen in ``awake()``.
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Add a message to the session
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Write any queued messages to the servlet response (equivalent
to ``self.write(self.messageText(...))``)
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Return the text of the message, wrapped with ``prefix`` and
``postfix``, or the empty string if no messages are available.
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Are there any messages waiting in the session message queue?
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Get a list of messages (empty list if none) from the session queue.
As long as ``remove`` is true (the default) then they messages
will be removed from the queue.
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