我试图创造一个Python应用程序,可以从服务器发送消息给客户端发送消息给客户端。目前我使用here这个示例代码。这是一个聊天应用程序,它工作正常。我试图修改应用程序,并在服务器端Python代码中添加一个新功能,该功能将在客户端打印一条消息“Dummy”,但看起来不起作用。如何从服务器使用瓶套接字IO
这里是我的html代码:
的index.html
<body>
<ul id="messages"></ul>
<ul id="output"></ul>
<form action="">
<input id="m" autocomplete="off" /><button>Send</button>
</form>
<script src="{{url_for('static', filename='assets/vendor/socket.io.min.js')}}"></script>
<script src="{{url_for('static', filename='assets/vendor/jquery.js')}}"></script>
<script>
var socket = io.connect('http://127.0.0.1:5000/chat');
$('form').submit(function(){
socket.emit('chat message', $('#m').val());
$('#m').val('');
return false;
});
socket.on('chat message', function(msg){
$('#messages').html($('<li>').text(msg));
});
socket.on('output', function(msg){
alert(msg)
$('#messages').html($('<li>').text(msg));
});
</script>
这里是我的后端代码:
web_app.py
from flask import Flask
from flask import render_template
from flask_socketio import SocketIO
from flask_socketio import emit
app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
socketio = SocketIO(app)
connected = False
def socket_onload(json):
socketio.emit('output', str(json), namespace='/chat')
print('received message: ' + str(json))
@socketio.on('chat message', namespace='/chat')
def handle_chat_message(json):
print('received message: ' + str(json))
emit('chat message', str(json), broadcast=True)
@socketio.on('connect') # global namespace
def handle_connect():
global connected
connected = True
print('Client connected')
@socketio.on('connect', namespace='/chat')
def handle_chat_connect():
print('Client connected to chat namespace')
emit('chat message', 'welcome!')
@socketio.on('disconnect', namespace='/chat')
def test_disconnect():
print('Client disconnected')
@app.route('/')
def index():
return render_template('index.html')
@app.route('/blah/')
def blah():
return render_template('blah.html')
main.py
import web_app
import threading
import time
def main():
import web_app
webapp_thread = threading.Thread(target=run_web_app)
webapp_thread.start()
# webapp_thread = threading.Thread(target=run_web_app, args=(i,))
while web_app.connected==False:
print "waiting for client to connect"
time.sleep(1)
pass
print "Connected..."
time.sleep(3)
print "Trying to print dummy message..."
web_app.socket_onload("Dummy")
def run_web_app():
web_app.socketio.run(web_app.app)
if __name__ == '__main__':
main()
我可以看到“收到的消息:虚拟”在终端,但没有对网络浏览器的变化。
很难知道,而无需一个完整的例子来进行测试。您是否在浏览器的控制台中查看是否有任何错误? – Miguel