Django+ajax implementing an online chat room

Source: Internet
Author: User

Django+ajax implementing an online chat room

One of the small projects is a simple chat room

    • To speak after registering for the login
    • Initial display of recent messages in a chat box
    • Sending messages using AJAX to complete the storage of messages in the background
    • Use round robin to constantly request get new messages to appear in the chat box

Design the structure of the chat message topic:

class Chat(models.Model):    sender = models.ForeignKey(User, related_name=‘has_chats‘)    content = models.TextField()    time = models.DateTimeField(auto_now_add=True, null=True)    def __unicode__(self):        returnu‘%s‘ % self.content
{% extends "base.html"%}{% block title%}Chat Room{% endblock %}{% block content%} <!--chat box-<div class="List-group col-md-10 col-md-offset-1 well ><div class="List-group-item">             {%  for chat  in chats%}<h4 class="list-group-item-heading">        {{Chat.sender}}:{{chat.content}} </h4><p class="List-group-item-text">         {{Chat.time}} </P><input type="Hidden" class="Chat_ ID " value="          {{}}  "/><br>                 {% endfor %} </div></div><!--form--<form id="Chatform" class="form-horizontal panel Container" method= "POST" Action="." >     {% csrf_token %}    <div class="Form-group col-md-10">        <textarea type= "text" name="Content" id="Content " value=" " class=" Form-control " id=" Examplemessage "  Placeholder=""></textarea>    </div>    <div class="Form-group col-md-4">        <input type="hidden" name="Post_type" value=" Send_chat "/>        <input type="Submit" class="btn btn-lg btn-primary" Value="Send"/>    </div></form>{% endblock %}
{% block script%}<script>$( function() {Updatemsg ();//Finer Information            //Form Submit Event$("#chatForm"). Submit ( function() {          //ajax submitting a form$.post ("./post/",              $(' #chatForm '). Serialize (), function(data) {$("#content"). Val ("");//Clear content box After message is sent successfully});return false;//block form submission}); });//Update message function updatemsg() {$.post ("./post/", {post_type:"Get_chat", last_chat_id: $ (". chat_id"). Last (). Val ()}, function(data) {$('. List-group-item '). append (data);//Parse the returned XML}); SetTimeout ("updatemsg ()", +);//Update once per second}</script>{% endblock %}

JS part of the main has two, one is to send messages, one is round-robin receive
Send the message part: Post the information in the Chatform form to the processing page, including the chat message content and Post_type, which is a variable of my own definition, used to handle different post requests on the same page address, where Post_type is Send_chat , the message is sent.
The part of the update message, the UPDATEMSG () function, uses the POST request to post data to the same address, including post_type:get_chat,last_chat_id: This is the ID of the last chat message obtained from the chat box, $(".chat_id").last().val() This is to ensure that the information is the last message after the chat information, and finally set the cycle time of one second, and constantly execute.

 def index(Request):Chats = List (Chat.objects.all ()) [- -:]returnRender (Request,' chatroom.html ', {' Chats ': Chats})@csrf_exempt def post(Request):    ifRequest.method = =' POST ': Post_type = Request. Post.get (' Post_type ')ifPost_type = =' Send_chat ': New_chat = Chat.objects.create (content = Request. Post.get (' content '), sender = Request.user,) ()returnHttpResponse ()elifPost_type = =' Get_chat ': last_chat_id = Int (request. Post.get (' last_chat_id '))#print last_chat_idChats = Chat.objects.filter (id__gt = last_chat_id)returnRender (Request,' chat_list.html ', {' Chats ': Chats})Else:RaiseHttp404
    • The index () function handles the main chat interface and queries the last 100 chat messages in the database to display in the chat box
    • The post () function processes the received Chat message request and determines the processing action according to the Post_type
      • Send_chat: Generate a new chat instance stored in the database, here can not return anything, because the chat message polling speed is fast, itself is constantly updating the message.
      • Get_chat: Get last_chat_id First, then use chats = Chat.objects.filter(id__gt = last_chat_id) this sentence to get the ID of all chat instances after last_chat_id, where filter (id__gt = last_chat_id) The filter ID is greater than the LAST_CHAT_ID object.

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Django+ajax implementing an online chat room

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