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authorAlexandre Bourget <alexandre.bourget@savoirfairelinux.com>2011-03-24 12:07:09 -0400
committerAlexandre Bourget <alexandre.bourget@savoirfairelinux.com>2011-03-24 12:07:09 -0400
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-.. _flash_chapter:
-
-Flash Messages
-==============
-
-"Flash messages" are simply a queue of message strings stored in the
-:term:`session`. To use flash messaging, you must enable a :term:`session
-factory` as described in :ref:`using_the_default_session_factory` or
-:ref:`using_alternate_session_factories`.
-
-Flash messaging has two main uses: to display a status message only once to
-the user after performing an internal redirect, and to allow generic code to
-log messages for single-time display without having direct access to an HTML
-template. The user interface consists of a number of methods of the
-:term:`session` object.
-
-Using the ``session.flash`` Method
-----------------------------------
-
-To add a message to a flash message queue, use a session object's ``flash``
-method:
-
-.. code-block:: python
- :linenos:
-
- request.session.flash('mymessage')
-
-The ``.flash`` method appends a message to a flash queue, creating the queue
-if necessary.
-
-``.flash`` accepts three arguments:
-
-.. method:: flash(message, queue='', allow_duplicate=True)
-
-The ``message`` argument is required. It represents a message you wish to
-later display to a user. It is usually a string but the ``message`` you
-provide is not modified in any way.
-
-The ``queue`` argument allows you to choose a queue to which to append the
-message you provide. This can be used to push different kinds of messages
-into flash storage for later display in different places on a page. You cam
-pass any name for your queue, but it must be a string. The default value is
-the empty string, which chooses the default queue. Each queue is independent,
-and can be popped by ``pop_flash`` or examined via ``peek_flash`` separately.
-``queue`` defaults to the empty string. The empty string represents the
-default flash message queue.
-
-.. code-block:: python
-
- request.session.flash(msg, 'myappsqueue')
-
-The ``allow_duplicate`` argument, which defaults to ``True``. If this is
-``False``, if you attempt to add a message to a queue which is already
-present in the queue, it will not be added.
-
-Using the ``session.pop_flash`` Method
---------------------------------------
-
-Once one or more messages has been added to a flash queue by the
-``session.flash`` API, the ``session.pop_flash`` API can be used to pop that
-queue and return it for use.
-
-To pop a particular queue of messages from the flash object, use the session
-object's ``pop_flash`` method.
-
-.. code-block:: python
- :linenos:
-
- >>> request.session.flash('info message')
- >>> request.session.pop_flash()
- ['info message']
-
-Calling ``session.pop_flash()`` again like above without a corresponding call
-to ``session.flash`` will return an empty list, because the queue has already
-been popped.
-
-.. code-block:: python
- :linenos:
-
- >>> request.session.flash('info message')
- >>> request.session.pop_flash()
- ['info message']
- >>> request.session.pop_flash()
- []
-
-The object returned from ``pop_flash`` is a list.
-
-Using the ``session.pop_flash`` Method
---------------------------------------
-
-Once one or more messages has been added to a flash queue by the
-``session.flash`` API, the ``session.peek_flash`` API can be used to "peek"
-at that queue. Unlike ``session.pop_flash``, the queue is not popped from
-flash storage.
-
-.. code-block:: python
- :linenos:
-
- >>> request.session.flash('info message')
- >>> request.session.peek_flash()
- ['info message']
- >>> request.session.peek_flash()
- ['info message']
- >>> request.session.pop_flash()
- ['info message']
- >>> request.session.peek_flash()
- []