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-.. _message-flashing-pattern:
-
-Message Flashing
-================
-
-Good applications and user interfaces are all about feedback.  If the user
-does not get enough feedback they will probably end up hating the
-application.  Flask provides a really simple way to give feedback to a
-user with the flashing system.  The flashing system basically makes it
-possible to record a message at the end of a request and access it next
-request and only next request.  This is usually combined with a layout
-template that does this.
-
-Simple Flashing
----------------
-
-So here is a full example::
-
-    from flask import flash, redirect, url_for, render_template
-
-    @app.route('/')
-    def index():
-        return render_template('index.html')
-
-    @app.route('/login', methods=['GET', 'POST'])
-    def login():
-        error = None
-        if request.method == 'POST':
-            if request.form['username'] != 'admin' or \
-               request.form['password'] != 'secret':
-                error = 'Invalid credentials'
-            else:
-                flash('You were successfully logged in')
-                return redirect(url_for('index'))
-        return render_template('login.html', error=error)
-
-And here the ``layout.html`` template which does the magic:
-
-.. sourcecode:: html+jinja
-
-   <!doctype html>
-   <title>My Application</title>
-   {% with messages = get_flashed_messages() %}
-     {% if messages %}
-       <ul class=flashes>
-       {% for message in messages %}
-         <li>{{ message }}</li>
-       {% endfor %}
-       </ul>
-     {% endif %}
-   {% endwith %}
-   {% block body %}{% endblock %}
-
-And here the index.html template:
-
-.. sourcecode:: html+jinja
-
-   {% extends "layout.html" %}
-   {% block body %}
-     <h1>Overview</h1>
-     <p>Do you want to <a href="{{ url_for('login') }}">log in?</a>
-   {% endblock %}
-
-And of course the login template:
-
-.. sourcecode:: html+jinja
-
-   {% extends "layout.html" %}
-   {% block body %}
-     <h1>Login</h1>
-     {% if error %}
-       <p class=error><strong>Error:</strong> {{ error }}
-     {% endif %}
-     <form action="" method=post>
-       <dl>
-         <dt>Username:
-         <dd><input type=text name=username value="{{
-             request.form.username }}">
-         <dt>Password:
-         <dd><input type=password name=password>
-       </dl>
-       <p><input type=submit value=Login>
-     </form>
-   {% endblock %}
-
-Flashing With Categories
-------------------------
-
-.. versionadded:: 0.3
-
-It is also possible to provide categories when flashing a message.  The
-default category if nothing is provided is ``'message'``.  Alternative
-categories can be used to give the user better feedback.  For example
-error messages could be displayed with a red background.
-
-To flash a message with a different category, just use the second argument
-to the :func:`~flask.flash` function::
-
-    flash(u'Invalid password provided', 'error')
-
-Inside the template you then have to tell the
-:func:`~flask.get_flashed_messages` function to also return the
-categories.  The loop looks slightly different in that situation then:
-
-.. sourcecode:: html+jinja
-
-   {% with messages = get_flashed_messages(with_categories=true) %}
-     {% if messages %}
-       <ul class=flashes>
-       {% for category, message in messages %}
-         <li class="{{ category }}">{{ message }}</li>
-       {% endfor %}
-       </ul>
-     {% endif %}
-   {% endwith %}
-
-This is just one example of how to render these flashed messages.  One
-might also use the category to add a prefix such as
-``<strong>Error:</strong>`` to the message.