socket.io和节点js:聊天不显示在屏幕上 [英] socket.io and node js: chat does not display on screen
问题描述
我尝试通过创建实时聊天来尝试socket.io，提交消息后页面会刷新，这是标记和客户端JS(index.html):
I was giving a try to socket.io by creating a live chat, and the page refreshes itself when the message is submitted, here is the markup and the client side JS (index.html):
<body>
<h1>Open chat</h1>
<form id="send_message">
<div class="chat">
</div>
<hr />
<input size="28" type="text" id="message" />
<input type="submit" value="send" />
</form>
<script src="http://code.jquery.com/jquery-latest-min.js"></script>
<script src="/socket.io/socket.io.js"></script>
<script>
JQuery(function($){
var socket = io.connect();
var $message_form = $('#send_message');
var $message_box = $('#message');
var $chat = $('#chat');
$message_form.submit(function(e){
e.preventDefault();
socket.emit('send message', $message_box.val());
$message_box.val('');
})
});
socket.on('new message', function(data){
$chat.append(data+'<br />');
});
</script>
</body>
这是服务器端js(app.js):
and here is the server side js (app.js):
var express = require('express'),
app = express(),
server = require('http').createServer(app),
io = require('socket.io').listen(server);
server.listen(3000);
app.get('/',function(req, res){
res.sendfile(__dirname + '/index.html');
});
io.sockets.on('connection',function(socket){
socket.on('send message', function(data){
io.sockets.emit('new message',data);
});
});
我知道你们不需要这个，但这是package.json:
I know you guys won't need this but this is package.json:
{
"name":"test_chat_application",
"version":"0.0.1",
"private":"true",
"dependencies":{
"socket.io":"1.4.8",
"express":"4.14.0"
}
}
基本上，我认为问题是页面刷新！ 请帮忙.
basically i think the problem is the page refresh! please help..
推荐答案
您必须放弃表单，更新一些内容(例如var socket = io()而不是var socket = io.connect()等)并使用onclick事件(而不是表单提交)处理您的发送按钮.这样一来，您就不会刷新.
You have to ditch the form, update some of the stuff (like var socket = io() instead of var socket = io.connect() and stuff) and handle your send button with onclick events instead of form submissions. That way you won't refresh.
无论如何，更新后的server.js:
Anyway, the updated server.js:
var express = require('express'),
app = express(),
server = require('http').createServer(app),
io = require('socket.io').listen(server);
server.listen(3000);
app.use(express.static('./'));
app.get('/',function(req, res){
res.sendFile(__dirname + '/index.html');
});
io.on('connection',function(socket){
console.log('SOMEONE CONNECTED:', socket.id);
socket.on('send', function(data){
console.log(data);
io.sockets.emit('new', data);
});
});
index.html
index.html
<body>
<h1>Open chat</h1>
<div class="chat">
<ul id="messages">
</ul>
</div>
<hr />
<input size="28" type="text" id="message" />
<input type="button" onclick="send()" value="send" />
<script src="https://cdn.socket.io/socket.io-1.4.5.js"></script>
<script>
var socket = io();
function send(){
var message = document.getElementById("message").value;
socket.emit("send", { "message" : message });
document.getElementById("message").value = "";
}
socket.on("new", function(data){
console.log("NEW MESSAGE : ", data);
var chatMessage = document.createElement("li");
chatMessage.innerHTML = data.message;
document.getElementById("messages").appendChild(chatMessage)
});
</script>
尝试一下，让我知道它是否有效
Try this and let me know if it works
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