views.py 文件源码

def messages(request):
    if request.method == METH_POST:
        # the 302 redirect is processed as an exception, so if this coroutine returns there's a form error
        form_errors = await process_form(request)
    else:
        form_errors = None
    # {% if session.is_secure %}

    # simple demonstration of sessions by pre-populating username if it's already been set
    session = await get_session(request)
    username = session.get('username', '')
    # {% else %}
    # we're not using sessions so there's no way to pre-populate the username
    username = ''
    # {% endif %}

    # {% if template_engine.is_jinja %}
    return {
        'title': 'Message board',
        'form_errors': form_errors,
        'username': username,
    }
    # {% else %}
    ctx = dict(
        title='Message board',
        styles_css_url=request.app['static_root_url'] + '/styles.css',
        content="""\
  <h2>Add a new message:</h2>
  <form method="post" action="{message_url}">
    {form_errors}
    <p>
      <label for="username">Your name:</label>
      <input type="text" name="username" id="username" placeholder="Fred Bloggs" value="{username}">
      <label for="message">Message:</label>
      <input type="text" name="message" id="message" placeholder="hello there">
    </p>
  <button type="submit">Post Message</button>
  </form>

  <h2>Messages:</h2>
  <div id="messages" data-url="{message_data_url}">
    <span class="error">messages not loading, it's possible <code>message_display.js</code> is not being served.</span>
  </div>
  <script src="{message_display_js_url}"></script>""".format(
            message_url=request.app.router['messages'].url(),
            message_data_url=request.app.router['message-data'].url(),
            message_display_js_url=request.app['static_root_url'] + '/message_display.js',
            form_errors=form_errors and '<div class="form-errors">{}</div>'.format(form_errors),
            username=username,
        )
    )
    return web.Response(text=BASE_PAGE.format(**ctx), content_type='text/html')
    # {% endif %}