Javascript &引用;“线程中的异常”;更新Flask应用中的键值对时出错
我正在构建一个基本的聊天程序(来自CS50s网络编程的Flack) 我有一个字典,我把频道和消息存储为键值对 消息位于列表中,因此一个键值对看起来像:Javascript &引用;“线程中的异常”;更新Flask应用中的键值对时出错,javascript,python,flask,socket.io,flask-socketio,Javascript,Python,Flask,Socket.io,Flask Socketio,我正在构建一个基本的聊天程序(来自CS50s网络编程的Flack) 我有一个字典,我把频道和消息存储为键值对 消息位于列表中,因此一个键值对看起来像: {“channelExample”:[“msg1”、“msg2”]} 我还有另一个变量,它跟踪用户正在发送消息的当前房间/频道,名为currentRoom 当用户提交消息时,我正试图通过执行以下操作来更新该通道中的消息(emit已导入&我已确认currentRoom&输入消息为字符串值): @socketio.on(“提交消息”) def sub
{“channelExample”:[“msg1”、“msg2”]}
我还有另一个变量,它跟踪用户正在发送消息的当前房间/频道,名为currentRoom
当用户提交消息时,我正试图通过执行以下操作来更新该通道中的消息(emit已导入&我已确认currentRoom&输入消息为字符串值):
@socketio.on(“提交消息”)
def submitMessage(消息):
频道[currentRoom]。追加(消息)
发出(“显示消息”,消息)
但是,频道[currentRoom]的线程中出现了一个“异常…”错误。追加(消息)
&我不确定原因
我在烧瓶中的完整代码:
导入操作系统
从flask导入flask、会话、呈现模板、url、请求、闪存、重定向、jsonify
从flask_socketio导入socketio,发送,发射,加入房间,离开房间
app=烧瓶(名称)
app.config[“SECRET\u KEY”]=os.getenv(“SECRET\u KEY”)
socketio=socketio(应用程序)
当前房间=无
通道={}
@附件路线(“/”)
def index():
返回render_模板(“welcome.html”,channels=channels)
@socketio.on(“新频道”)
def新频道(频道名称):
#存储新频道以跟踪它
channels.update({channelName:[]})
@socketio.on(“检索频道”)
def RetrieveChannel():
channelNames=[]
对于通道中的通道:
channelNames.append(频道)
发射(“提供通道”,通道名称)
@socketio.on(“检索消息”)
def加载消息(通道名称):
currentRoom=channelName
channelMessages=频道[currentRoom]
发出(“加载消息”,通道消息)
@socketio.on(“提交消息”)
def submitMessage(消息):
频道[currentRoom]。追加(消息)
发出(“显示消息”,消息)
Javascript:
document.addEventListener('DOMContentLoaded', () => {
// Connect to websocket
var socket = io.connect(location.protocol + '//' + document.domain + ':' + location.port);
// When connected,
socket.on('connect', () => {
var nameInput = document.querySelector("#usernameInput");
var welcomeMessage = document.querySelector("#welcomeMessage");
var createChannel = document.querySelector("#createChannel");
var newChannelForm = document.querySelector("#newChannelForm");
var newMessageForm = document.querySelector("#newMessageForm");
function userExists() {
// Check if user has come here before
if (localStorage.getItem("username")) {
// Display a welcome message
welcomeMessage.innerHTML = `Welcome back ${localStorage.getItem("username")}!`;
nameInput.style.display = "none";
return true;
}
else {
return false;
}
};
function createChannelBtn(name) {
// Create new channel & style it
let newChannel = document.createElement("button");
newChannel.id = name;
newChannel.innerHTML = name;
newChannel.className = "btn btn-block btn-outline-dark";
newChannel.style.display = "block";
// Attach to current list
document.querySelector("#channels").appendChild(newChannel);
// When someone clicks the channel
newChannel.onclick = () => {
newChannel.classList.toggle("active");
socket.emit("retrieve messages", newChannel.id);
console.log("Retrieving messages!!!");
socket.on("load messages", channelMessages => {
console.log("loading messages!");
for (let i = 0; i < channelMessages.length; i++) {
createMessage(channelMessages[i]);
}
});
};
};
function createMessage(messageContent) {
let message = document.createElement("h6");
message.innerHTML = messageContent;
document.querySelector("#messageWindow").appendChild(message);
console.log("Currently creating message!");
};
function loadChannels() {
socket.emit("retrieve channels")
socket.on("providing channels", channelNames => {
for (let i = 0; i < channelNames.length; i++) {
createChannelBtn(channelNames[i]);
}
});
};
// Make sure the new channel form is not displayed until "Create channel" button is clicked
newChannelForm.style.display = "none";
// Check if user exists already in local storage
userExists();
loadChannels();
// If someone submits a username...
nameInput.addEventListener("click", () => {
// if that username exists, do nothing
if (userExists()) {
}
// else remember the username
else {
localStorage.setItem("username", document.querySelector("#user").value);
}
});
// When someone wants to create a channel
createChannel.addEventListener("click", () => {
// Show form
newChannelForm.style.display = "block";
// When user inputs new channel name...
newChannelForm.onsubmit = () => {
// Retrieve their input
var newChannelName = document.querySelector("#newChannel").value;
// Create a new channel
createChannelBtn(newChannelName);
// Notify server to store new channel
socket.emit("new channel", newChannelName);
// Clear input field
document.querySelector("#newChannel").innerHTML = "";
return false;
};
});
newMessageForm.onsubmit = () => {
let message = document.querySelector("#newMessage").value;
console.log("You have entered " + message);
socket.emit("submit message", message);
console.log("Submitted message!");
socket.on("display message", message => {
createMessage(message);
console.log("Displaying message!!");
});
return false;
};
});
// DOM Ending Bracket
});
document.addEventListener('DOMContentLoaded',()=>{
//连接到websocket
var socket=io.connect(location.protocol+'/'+document.domain+':'+location.port);
//当连接时,
socket.on('connect',()=>{
var nameInput=document.querySelector(“#usernameInput”);
var welcomeMessage=document.querySelector(“welcomeMessage”);
var createChannel=document.querySelector(“createChannel”);
var newChannelForm=document.querySelector(“newChannelForm”);
var newMessageForm=document.querySelector(“newMessageForm”);
函数userExists(){
//检查用户以前是否来过这里
if(localStorage.getItem(“用户名”)){
//显示欢迎信息
welcomeMessage.innerHTML=`欢迎回来${localStorage.getItem(“用户名”)}!`;
nameInput.style.display=“无”;
返回true;
}
否则{
返回false;
}
};
函数createChannelBtn(名称){
//创建新频道并设置其样式
让newChannel=document.createElement(“按钮”);
newChannel.id=名称;
newChannel.innerHTML=名称;
newChannel.className=“btn btn块btn轮廓暗”;
newChannel.style.display=“block”;
//附加到当前列表
document.querySelector(“#channels”).appendChild(newChannel);
//当有人点击频道时
newChannel.onclick=()=>{
newChannel.classList.toggle(“活动”);
emit(“检索消息”,newChannel.id);
log(“检索消息!!!”;
socket.on(“加载消息”,channelMessages=>{
log(“加载消息!”);
for(设i=0;i{
for(设i=0;i{
//如果该用户名存在,则不执行任何操作
如果(userExists()){
}
//还记得用户名吗
否则{
localStorage.setItem(“用户名”,document.querySelector(“用户”).value);
}
});
//当有人想要创建频道时
createChannel.addEventListener(“单击”,()=>{
//表演形式
newChannelForm.style.display=“block”;
//当用户输入新频道名称时。。。
newChannelForm.onsubmit=()=>{
//检索他们的输入
var newChannelName=document.querySelector(“#newChannel”).value;
//创建一个新频道
createChannelBtn(newChannelName);
//通知ser