Django messages 消息（下）

add_message(request, level, message, extra_tags="", fail_silently=False)

from django.contrib import messages
messages.add_message(request, messages.INFO, 'Hello world!')

messages.debug(request, "%s SQL statements were executed." % count)
messages.info(request, "Three credits remain in your account.")
messages.success(request, "Profile details updated.")
messages.warning(request, "Your account expires in three days.")
messages.error(request, "Document deleted.")

get_messages(request)

{% if messages %}
<ul class="messages">
  {% for message in messages %}
    <li {% if message.tags %} class="{{ message.tags }}"{% endif %}>{{ message }}</li>
  {% endfor %}
</ul>
{% endif %}

from django.contrib.messages import constants as message_constants

MESSAGE_LEVEL = message_constants.INFO

TEMPLATES = [
  {
    "BACKEND": "django.template.backends.django.DjangoTemplates",
    "DIRS": [os.path.join(BASE_DIR, "templates")],
    "APP_DIRS": True,
    "OPTIONS": {
      "context_processors": [
        "django.template.context_processors.debug",
        "django.template.context_processors.request",
        "django.contrib.auth.context_processors.auth",
        "django.contrib.messages.context_processors.messages",
      ]
    }
  }
]

from django.contrib import messages

def flash(request, title, text, level="info"):
  """
  利用 django 的 message 系统发送一个消息
  """
  level_map = {
    "info": messages.INFO,
    "debug": messages.DEBUG,
    "success": messages.SUCCESS,
    "warning": messages.WARNING,
    "error": messages.ERROR
  }
  
  level = level_map[level]
  
  messages.add_message(request, level, text, extra_tags=title)
  return "ok"

{% if messages %}
<script>
  {% for msg in messages %}
    alert("{{ msg.message }}")
  {% endfor %}
</script>
{% endif %}