【发布时间】：2010-11-28 12:08:02
【问题描述】：
我正在构建一个多用户画板，但在获取和保持所有当前连接用户的更新列表时遇到了一些问题。我正在尝试找到将新客户端通知所有现有客户端并将现有客户端传递给新连接的客户端的最佳方法。我尝试这样做的原因是，当一个客户端画一条线时，所有其他客户端都会在列表中找到该客户端，并将线坐标添加到相应的数组中。
服务器.js
var sys = require("sys");
var ws = require('websocket-server');
var server = ws.createServer({debug: true});
server.addListener("connection", function(conn) {
// When a message is received, broadcast it too all the clients
// that are currently connected.
conn.send('NEW_SERVER_MESSAGE:Welcome!');
conn.send('USER_CONNECTED:' + conn.id);
conn.addListener("message", function( msg ){
switch(msg) {
case 'GET_ALL_ACTIVE_USERS':
server.manager.forEach(function(con) {
conn.broadcast('USER_CONNECTED:' + con.id);
});
break;
case 'UPDATE_CURSOR':
conn.broadcast( msg + '_' + conn.id );
break;
default:
conn.broadcast( msg );
break;
}
});
conn.addListener('close', function( msg ) {
conn.broadcast('USER_DISCONNECTED:' + conn.id);
});
});
server.addListener("error", function(){
console.log(Array.prototype.join.call(arguments, ", "));
});
server.addListener("listening", function(){
console.log("Listening for connections...");
});
server.addListener("disconnected", function(conn){
console.log("<"+conn.id+"> disconnected.");
});
server.listen(8002);</code>
我的JS网络代码：
sketchPadNet = function (b,s) {
var self = this;
this.host = "ws://localhost:8002/server.js";
this.id = null;
this.users = [];
this.heightOffset = 53;
this.scene = s;
this.connected = b;
var User = function(id) {
this.id = id;
this.nickname = id;
this.lines = [];
this.position = "";
};
this.init = function () {
try {
socket = new WebSocket(self.host);
socket.onopen = function (msg) {
socket.send('GET_ALL_ACTIVE_USERS');
};
socket.onmessage = function (msg) {
var m = msg.data.split(':');
switch(m[0]) {
case 'USER_CONNECTED':
console.log('USER_CONNECTED');
var u = new User(m[1]);
u.lines = [];
u.nickname = u.id;
self.users.push(u);
console.log(self.users.length);
console.log(self.users);
break;
case 'USER_DISCONNECTED':
console.log('USER_DISCONNECTED');
for(var i = 0; i < self.users.length; ++i) {
console.log(self.users[i]);
if(m[1] == self.users[i].id) {
self.users.splice(i, 1);
}
}
break;
case 'DRAW_LINE':
var tmpMsg = m[1].split('_');
var id = tmpMsg[8];
var userIndex = '';
for(var i = 0; i < self.users.length; ++i) {
if(self.users[i].id == id) userIndex = i;
}
var p1 = (self.users[userIndex].lines.length < 1) ? new BLUR.Vertex3(tmpMsg[0], tmpMsg[1], tmpMsg[2]) : self.users[userIndex].lines[self.users[userIndex].lines.length - 1].point2;
var p2 = new BLUR.Vertex3(tmpMsg[3], tmpMsg[4], tmpMsg[5]);
var line = new BLUR.Line3D(p1, p2, tmpMsg[7]);
line.material = tmpMsg[6];
// add the newly created line to the scene.
self.scene.addObject(line);
self.users[userIndex].lines.push(line);
break;
case 'UPDATE_CURSOR':
for(var i = 0; i < self.scene.objects.length; ++i) {
if(self.scene.objects[i].type == 'BLUR.Particle')
self.scene.removeObject(scene.objects[i]);
}
var coords = m[1].split('_');
var id = coords[2];
var userIndex = 0;
for(var i = 0; i < self.users.length; ++i) {
if(self.users[i].id == id)
userIndex = i;
}
self.users[userIndex].position = new BLUR.Vertex3(coords[0], coords[1], 1);
var p = new BLUR.Particle( self.users[userIndex].position, 4 );
p.material = new BLUR.RGBColour(176,23,31,0.3);
self.scene.addObject(p);
break;
case 'RECEIVE_ID':
self.id = m[1];
self.connected.nicknameObj.text = self.id;
console.log(self.id);
break;
break;
}
};
socket.onclose = function (msg) {
// feck!
self.connected.addServerError('Server disconnected, try refreshing.');
};
}
catch (ex) {
console.log('EXCEPTION: ' + ex);
}
};
目前，当一个新的客户端连接时，它会发出一条消息并添加到一个数组中，当客户端断开连接时则相反。出于某种原因，虽然这不是保持更新？例如当客户端画一条线时，其他一些人会报告这个错误：
Uncaught TypeError: Cannot read property 'lines' of undefined
对不起，如果我在这里非常愚蠢，但感谢任何帮助！
干杯:)
【问题讨论】：
-
所以您在服务器端使用 Javascript？您为此使用哪种框架/容器？
-
我在使用 Node.js 和 github.com/miksago/node-websocket-server。
标签： javascript node.js websocket