Tutorial Part 2: Templates

We will edit the views, urls and templates for posting a Room form, and joining it.

We will edit the index.html file, for posting a new room.

{% extends "chat/layout.html" %}

{% block content %}
    What chat room would you like to enter?<br>
    <form method="POST">
        <input id="room-name-input" name="name" type="text" size="100"><br>
        <input id="room-name-submit" type="button" value="Enter">
    </form>
{% endblock content %}

Next, edit urls.py.

from django.urls import path
from . import views

urlpatterns = [
    path('', views.index, name='index'),
    path('room/<int:pk>/', views.room, name='room'),

]

Editing existing views

We will edit the views.py

from django.http import HttpResponseRedirect
from django.shortcuts import get_object_or_404, render, reverse

from .models import Room

def index(request):
    if request.method == "POST":
        name = request.POST.get("name", None)
        if name:
            room = Room.objects.create(name=name, host=request.user)
            HttpResponseRedirect(reverse("room", args=[room.pk]))
    return render(request, 'chat/index.html')

def room(request, pk):
    room: Room = get_object_or_404(Room, pk=pk)
    return render(request, 'chat/room.html', {
        "room":room,
    })

{% extends "chat/layout.html" %}
{% load static %}


{% block content %}
    <textarea id="chat-log" cols="100" rows="20"></textarea><br>
    <input id="chat-message-input" type="text" size="100"><br>
    <input id="chat-message-submit" type="button" value="Send">
{% endblock content %}

{% block footer %}
    <script>
        const room_pk = "{{ room.pk }}";
        const request_id = "{{ request.sessions.session_key }}";

        const chatSocket = new WebSocket(`ws://${window.location.host}/ws/chat/`);


        chatSocket.onopen = function(){
            chatSocket.send(
                JSON.stringify({
                    pk:room_pk,
                    action:"join_room",
                    request_id:request_id,
                })
            );
                            chatSocket.send(
                JSON.stringify({
                    pk:room_pk,
                    action:"retrieve",
                    request_id:request_id,
                })
            );
                            chatSocket.send(
                JSON.stringify({
                    pk:room_pk,
                    action:"subscribe_to_messages_in_room",
                    request_id:request_id,
                })
            );
                            chatSocket.send(
                JSON.stringify({
                    pk:room_pk,
                    action:"subscribe_instance",
                    request_id:request_id,
                })
            );
        };

        chatSocket.onmessage = function (e) {
            const data = JSON.parse(e.data);
            switch (data.action) {
                case "retrieve":
                    setRoom(old => data.data);
                    setMessages(old => data.messages);
                    break;
                case "create":
                    setMessages(old => [...old, data])
                    break;
                default:
                    break;
            }
            break;
        };

        chatSocket.onclose = function(e) {
            console.error('Chat socket closed unexpectedly');
        };

        $('#chat-message-input').focus();
        $('#chat-message-input').on('keyup', function(e){
            if (e.keyCode === 13) {  // enter, return
                document.querySelector('#chat-message-submit').click();
            }
        });

        $('#chat-message-submit').on('click', function(e){
            const message = $('#chat-message-input').val();
            chatSocket.send(JSON.stringify({
                message: message,
                action: "create_message",
                request_id: request_id
            }));
            $('#chat-message-input').val('') ;
        });

</script>
{% endblock footer %}