trunk/public_html/meteor.js

/*
stream: xhrinteractive, iframe, serversent
longpoll
smartpoll
simplepoll
*/

Meteor = {

        callbacks: {
                process: function() {},
                reset: function() {},
                eof: function() {},
                statuschanged: function() {},
                changemode: function() {}
        },
        channelcount: 0,
        channels: {},
        debugmode: false,
        frameref: null,
        host: null,
        hostid: null,
        maxpollfreq: 60000,
        minpollfreq: 2000,
        mode: "stream",
        pingtimeout: 20000,
        pingtimer: null,
        pollfreq: 3000,
        port: 80,
        polltimeout: 30000,
        recvtimes: [],
        status: 0,
        updatepollfreqtimer: null,

        register: function(ifr) {
                ifr.p = Meteor.process;
                ifr.r = Meteor.reset;
                ifr.eof = Meteor.eof;
                ifr.ch = Meteor.channelInfo;
                clearTimeout(Meteor.frameloadtimer);
                Meteor.setstatus(4);
                Meteor.log("Frame registered");
        },

        joinChannel: function(channelname, backtrack) {
                if (typeof(Meteor.channels[channelname]) != "undefined") throw "Cannot join channel "+channelname+": already subscribed";
                Meteor.channels[channelname] = {backtrack:backtrack};
                Meteor.log("Joined channel "+channelname);
                Meteor.channelcount++;
                if (Meteor.status != 0 && Meteor.status != 6) Meteor.connect();
        },

        leaveChannel: function(channelname) {
                if (typeof(Meteor.channels[channelname]) == "undefined") throw "Cannot leave channel "+channelname+": not subscribed";
                delete Meteor.channels[channelname];
                Meteor.log("Left channel "+channelname);
                Meteor.channelcount--;
                if (Meteor.channelcount && Meteor.status != 0 && Meteor.status != 6) Meteor.connect();
                else Meteor.disconnect();
        },

        connect: function() {
                Meteor.log("Connecting");
                if (!Meteor.host) throw "Meteor host not specified";
                if (isNaN(Meteor.port)) throw "Meteor port not specified";
                if (!Meteor.channelcount) throw "No channels specified";
                if (Meteor.status) Meteor.disconnect();
                Meteor.setstatus(1);
                var now = new Date();
                var t = now.getTime();
                if (!Meteor.hostid) Meteor.hostid = t+""+Math.floor(Math.random()*1000000)
                document.domain = Meteor.extract_xss_domain(document.domain);
                if (Meteor.mode=="stream") Meteor.mode = Meteor.selectStreamTransport();
                Meteor.log("Selected "+Meteor.mode+" transport");
                if (Meteor.mode=="xhrinteractive" || Meteor.mode=="iframe" || Meteor.mode=="serversent") {
                        if (Meteor.mode == "iframe") {
                                Meteor.loadFrame(Meteor.getSubsUrl());
                        } else {
                                Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/stream.html");
                        }
                        clearTimeout(Meteor.pingtimer);
                        Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout);

                } else {
                        Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/poll.html");
                        Meteor.recvtimes[0] = t;
                        if (Meteor.updatepollfreqtimer) clearTimeout(Meteor.updatepollfreqtimer);
                        if (Meteor.mode=='smartpoll') Meteor.updatepollfreqtimer = setInterval(Meteor.updatepollfreq, 10000);
                        if (Meteor.mode=='longpoll') Meteor.pollfreq = Meteor.minpollfreq;
                }
                Meteor.lastrequest = t;
        },

        disconnect: function() {
                if (Meteor.status) {
                        clearTimeout(Meteor.pingtimer);
                        clearTimeout(Meteor.updatepollfreqtimer);
                        clearTimeout(Meteor.frameloadtimer);
                        if (typeof CollectGarbage == 'function') CollectGarbage();
                        if (Meteor.status != 6) Meteor.setstatus(0);
                        Meteor.log("Disconnected");
                        try { Meteor.frameref.parentNode.removeChild(Meteor.frameref); delete Meteor.frameref; return true; } catch(e) { }
                        try { Meteor.frameref.open(); Meteor.frameref.close(); return true; } catch(e) {}                       
                }
        },
        
        selectStreamTransport: function() {
                try {
                        var test = ActiveXObject;
                        return "iframe";
                } catch (e) {}
                if ((typeof window.addEventStream) == "function") return "iframe";
                return "xhrinteractive";
        },

        getSubsUrl: function() {
                var surl = "http://" + Meteor.host + ((Meteor.port==80)?"":":"+Meteor.port) + "/push/" + Meteor.hostid + "/" + Meteor.mode;
                for (var c in Meteor.channels) {
                        surl += "/"+c;
                        if (typeof Meteor.channels[c].lastmsgreceived != 'undefined' && Meteor.channels[c].lastmsgreceived >= 0) {
                                surl += ".r"+(Meteor.channels[c].lastmsgreceived+1);
                        } else if (Meteor.channels[c].backtrack > 0) {
                                surl += ".b"+Meteor.channels[c].backtrack;
                        } else if (Meteor.channels[c].backtrack != undefined) {
                                surl += ".h";
                        }
                }
                var now = new Date();
                surl += "?nc="+now.getTime();
                return surl;
        },

        loadFrame: function(url) {
                try {
                        if (!Meteor.frameref) {
                                var transferDoc = new ActiveXObject("htmlfile");
                                Meteor.frameref = transferDoc;
                        }
                        Meteor.frameref.open();
                        Meteor.frameref.write("<html><script>");
                        Meteor.frameref.write("document.domain=\""+(document.domain)+"\";");
                        Meteor.frameref.write("</"+"script></html>");
                        Meteor.frameref.parentWindow.Meteor = Meteor;
                        Meteor.frameref.close();
                        var ifrDiv = Meteor.frameref.createElement("div");
                        Meteor.frameref.appendChild(ifrDiv);
                        ifrDiv.innerHTML = "<iframe src=\""+url+"\"></iframe>";
                } catch (e) {
                        if (!Meteor.frameref) {
                                var ifr = document.createElement("IFRAME");
                                ifr.style.width = "10px";
                                ifr.style.height = "10px";
                                ifr.style.border = "none";
                                ifr.style.position = "absolute";
                                ifr.style.top = "-10px";
                                ifr.style.marginTop = "-10px";
                                ifr.style.zIndex = "-20";
                                ifr.Meteor = Meteor;
                                document.body.appendChild(ifr);
                                Meteor.frameref = ifr;
                        }
                        Meteor.frameref.setAttribute("src", url);
                }
                Meteor.log("Loading URL '"+url+"' into frame...");
                Meteor.frameloadtimer = setTimeout(Meteor.frameloadtimeout, 5000);
        },

        pollmode: function() {
                Meteor.log("Ping timeout");
                if (Meteor.mode != "smartpoll") {
                        Meteor.mode="smartpoll";
                        Meteor.callbacks["changemode"]("poll");
                        clearTimeout(Meteor.pingtimer);
                        Meteor.lastpingtime = false;
                }
                Meteor.connect();
        },

        process: function(id, channel, data) {
                if (id == -1) {
                        Meteor.log("Ping");
                        Meteor.ping();
                } else if (typeof(Meteor.channels[channel]) != "undefined") {
                        Meteor.log("Message "+id+" received on channel "+channel+" (last id on channel: "+Meteor.channels[channel].lastmsgreceived+")\n"+data);
                        Meteor.callbacks["process"](data);
                        Meteor.channels[channel].lastmsgreceived = id;
                        if (Meteor.mode=="smartpoll") {
                                var now = new Date();
                                Meteor.recvtimes[Meteor.recvtimes.length] = now.getTime();
                                while (Meteor.recvtimes.length > 5) Meteor.recvtimes.shift();
                        }
                }
                Meteor.setstatus(5);
        },

        ping: function() {
                if (Meteor.pingtimer) {
                        clearTimeout(Meteor.pingtimer);
                        Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout);
                        var now = new Date();
                        Meteor.lastpingtime = now.getTime();
                }
                Meteor.setstatus(5);
        },

        reset: function() {
                if (Meteor.status != 6 && Meteor.status != 0) {
                        Meteor.log("Stream reset");
                        Meteor.ping();
                        Meteor.callbacks["reset"]();
                        var now = new Date();
                        var t = now.getTime();
                        var x = Meteor.pollfreq - (t-Meteor.lastrequest);
                        if (x < 10) x = 10;
                        setTimeout(Meteor.connect, x);
                }
        },

        eof: function() {
                Meteor.log("Received end of stream, will not reconnect");
                Meteor.callbacks["eof"]();
                Meteor.setstatus(6);
                Meteor.disconnect();
        },

        channelInfo: function(channel, id) {
                Meteor.channels[channel].lastmsgreceived = id;
                Meteor.log("Received channel info for channel "+channel+": resume from "+id);
        },

        updatepollfreq: function() {
                var now = new Date();
                var t = now.getTime();
                var avg = 0;
                for (var i=1; i<Meteor.recvtimes.length; i++) {
                        avg += (Meteor.recvtimes[i]-Meteor.recvtimes[i-1]);
                }
                avg += (t-Meteor.recvtimes[Meteor.recvtimes.length-1]);
                avg /= Meteor.recvtimes.length;
                var target = avg/2;
                if (target < Meteor.pollfreq && Meteor.pollfreq > Meteor.minpollfreq) Meteor.pollfreq = Math.ceil(Meteor.pollfreq*0.9);
                if (target > Meteor.pollfreq && Meteor.pollfreq < Meteor.maxpollfreq) Meteor.pollfreq = Math.floor(Meteor.pollfreq*1.05);
        },

        registerEventCallback: function(evt, funcRef) {
                Function.prototype.andThen=function(g) {
                        var f=this;
                        var a=Meteor.arguments
                        return function(args) {
                                f(a);g(args);
                        }
                };
                if (typeof Meteor.callbacks[evt] == "function") {
                        Meteor.callbacks[evt] = (Meteor.callbacks[evt]).andThen(funcRef);
                } else {
                        Meteor.callbacks[evt] = funcRef;
                }
        },

        frameloadtimeout: function() {
                Meteor.log("Frame load timeout");
                if (Meteor.frameloadtimer) clearTimeout(Meteor.frameloadtimer);
                Meteor.setstatus(3);
                Meteor.pollmode();
        },

        extract_xss_domain: function(old_domain) {
                if (old_domain.match(/^(\d{1,3}\.){3}\d{1,3}$/)) return old_domain;
                domain_pieces = old_domain.split('.');
                return domain_pieces.slice(-2, domain_pieces.length).join(".");
        },

        setstatus: function(newstatus) {
                // Statuses:    0 = Uninitialised,
                //                              1 = Loading stream,
                //                              2 = Loading controller frame,
                //                              3 = Controller frame timeout, retrying.
                //                              4 = Controller frame loaded and ready
                //                              5 = Receiving data
                //                              6 = End of stream, will not reconnect

                if (Meteor.status != newstatus) {
                        Meteor.status = newstatus;
                        Meteor.callbacks["statuschanged"](newstatus);
                }
        },

        log: function(logstr) {
                if (Meteor.debugmode) {
                        if (window.console) {
                                window.console.log(logstr);
                        } else if (document.getElementById("meteorlogoutput")) {
                                document.getElementById("meteorlogoutput").innerHTML += logstr+"<br/>";
                        }
                }
        }
}

var oldonunload = window.onunload;
if (typeof window.onunload != 'function') {
        window.onunload = Meteor.disconnect;
} else {
        window.onunload = function() {
                if (oldonunload) oldonunload();
                Meteor.disconnect();
        }
}
1	andrew.betts	32	/*
2			stream: xhrinteractive, iframe, serversent
3			longpoll
4			smartpoll
5			simplepoll
6			*/
7
8			Meteor = {
9
10			callbacks: {
11			process: function() {},
12			reset: function() {},
13			eof: function() {},
14			statuschanged: function() {},
15			changemode: function() {}
16			},
17			channelcount: 0,
18			channels: {},
19			debugmode: false,
20			frameref: null,
21			host: null,
22			hostid: null,
23			maxpollfreq: 60000,
24			minpollfreq: 2000,
25			mode: "stream",
26			pingtimeout: 20000,
27			pingtimer: null,
28	andrew.betts	39	pollfreq: 3000,
29	andrew.betts	32	port: 80,
30			polltimeout: 30000,
31			recvtimes: [],
32			status: 0,
33			updatepollfreqtimer: null,
34
35			register: function(ifr) {
36			ifr.p = Meteor.process;
37			ifr.r = Meteor.reset;
38			ifr.eof = Meteor.eof;
39	andrew.betts	53	ifr.ch = Meteor.channelInfo;
40	andrew.betts	32	clearTimeout(Meteor.frameloadtimer);
41			Meteor.setstatus(4);
42			Meteor.log("Frame registered");
43			},
44
45			joinChannel: function(channelname, backtrack) {
46			if (typeof(Meteor.channels[channelname]) != "undefined") throw "Cannot join channel "+channelname+": already subscribed";
47	andrew.betts	59	Meteor.channels[channelname] = {backtrack:backtrack};
48	andrew.betts	32	Meteor.log("Joined channel "+channelname);
49			Meteor.channelcount++;
50	andrew.betts	61	if (Meteor.status != 0 && Meteor.status != 6) Meteor.connect();
51	andrew.betts	32	},
52
53			leaveChannel: function(channelname) {
54			if (typeof(Meteor.channels[channelname]) == "undefined") throw "Cannot leave channel "+channelname+": not subscribed";
55			delete Meteor.channels[channelname];
56			Meteor.log("Left channel "+channelname);
57			Meteor.channelcount--;
58	andrew.betts	61	if (Meteor.channelcount && Meteor.status != 0 && Meteor.status != 6) Meteor.connect();
59	andrew.betts	59	else Meteor.disconnect();
60	andrew.betts	32	},
61
62			connect: function() {
63			Meteor.log("Connecting");
64			if (!Meteor.host) throw "Meteor host not specified";
65			if (isNaN(Meteor.port)) throw "Meteor port not specified";
66			if (!Meteor.channelcount) throw "No channels specified";
67			if (Meteor.status) Meteor.disconnect();
68			Meteor.setstatus(1);
69			var now = new Date();
70			var t = now.getTime();
71			if (!Meteor.hostid) Meteor.hostid = t+""+Math.floor(Math.random()*1000000)
72			document.domain = Meteor.extract_xss_domain(document.domain);
73			if (Meteor.mode=="stream") Meteor.mode = Meteor.selectStreamTransport();
74			Meteor.log("Selected "+Meteor.mode+" transport");
75			if (Meteor.mode=="xhrinteractive" \|\| Meteor.mode=="iframe" \|\| Meteor.mode=="serversent") {
76			if (Meteor.mode == "iframe") {
77			Meteor.loadFrame(Meteor.getSubsUrl());
78			} else {
79			Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/stream.html");
80			}
81			clearTimeout(Meteor.pingtimer);
82			Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout);
83
84			} else {
85			Meteor.loadFrame("http://"+Meteor.host+((Meteor.port==80)?"":":"+Meteor.port)+"/poll.html");
86			Meteor.recvtimes[0] = t;
87			if (Meteor.updatepollfreqtimer) clearTimeout(Meteor.updatepollfreqtimer);
88	andrew.betts	60	if (Meteor.mode=='smartpoll') Meteor.updatepollfreqtimer = setInterval(Meteor.updatepollfreq, 10000);
89	andrew.betts	32	if (Meteor.mode=='longpoll') Meteor.pollfreq = Meteor.minpollfreq;
90			}
91			Meteor.lastrequest = t;
92			},
93
94			disconnect: function() {
95			if (Meteor.status) {
96			clearTimeout(Meteor.pingtimer);
97			clearTimeout(Meteor.updatepollfreqtimer);
98			clearTimeout(Meteor.frameloadtimer);
99			if (typeof CollectGarbage == 'function') CollectGarbage();
100	andrew.betts	55	if (Meteor.status != 6) Meteor.setstatus(0);
101			Meteor.log("Disconnected");
102	andrew.betts	61	try { Meteor.frameref.parentNode.removeChild(Meteor.frameref); delete Meteor.frameref; return true; } catch(e) { }
103			try { Meteor.frameref.open(); Meteor.frameref.close(); return true; } catch(e) {}
104	andrew.betts	32	}
105			},
106
107			selectStreamTransport: function() {
108			try {
109			var test = ActiveXObject;
110			return "iframe";
111			} catch (e) {}
112			if ((typeof window.addEventStream) == "function") return "iframe";
113			return "xhrinteractive";
114			},
115
116			getSubsUrl: function() {
117			var surl = "http://" + Meteor.host + ((Meteor.port==80)?"":":"+Meteor.port) + "/push/" + Meteor.hostid + "/" + Meteor.mode;
118			for (var c in Meteor.channels) {
119			surl += "/"+c;
120	andrew.betts	59	if (typeof Meteor.channels[c].lastmsgreceived != 'undefined' && Meteor.channels[c].lastmsgreceived >= 0) {
121	andrew.betts	32	surl += ".r"+(Meteor.channels[c].lastmsgreceived+1);
122			} else if (Meteor.channels[c].backtrack > 0) {
123			surl += ".b"+Meteor.channels[c].backtrack;
124	andrew.betts	59	} else if (Meteor.channels[c].backtrack != undefined) {
125	andrew.betts	32	surl += ".h";
126			}
127			}
128	andrew.betts	55	var now = new Date();
129			surl += "?nc="+now.getTime();
130	andrew.betts	32	return surl;
131			},
132
133			loadFrame: function(url) {
134			try {
135	andrew.betts	39	if (!Meteor.frameref) {
136			var transferDoc = new ActiveXObject("htmlfile");
137			Meteor.frameref = transferDoc;
138			}
139			Meteor.frameref.open();
140			Meteor.frameref.write("<html><script>");
141			Meteor.frameref.write("document.domain=\""+(document.domain)+"\";");
142			Meteor.frameref.write("</"+"script></html>");
143			Meteor.frameref.parentWindow.Meteor = Meteor;
144			Meteor.frameref.close();
145			var ifrDiv = Meteor.frameref.createElement("div");
146			Meteor.frameref.appendChild(ifrDiv);
147	andrew.betts	32	ifrDiv.innerHTML = "<iframe src=\""+url+"\"></iframe>";
148			} catch (e) {
149	andrew.betts	39	if (!Meteor.frameref) {
150			var ifr = document.createElement("IFRAME");
151			ifr.style.width = "10px";
152			ifr.style.height = "10px";
153			ifr.style.border = "none";
154			ifr.style.position = "absolute";
155			ifr.style.top = "-10px";
156			ifr.style.marginTop = "-10px";
157			ifr.style.zIndex = "-20";
158			ifr.Meteor = Meteor;
159			document.body.appendChild(ifr);
160			Meteor.frameref = ifr;
161			}
162			Meteor.frameref.setAttribute("src", url);
163	andrew.betts	32	}
164			Meteor.log("Loading URL '"+url+"' into frame...");
165			Meteor.frameloadtimer = setTimeout(Meteor.frameloadtimeout, 5000);
166			},
167
168			pollmode: function() {
169			Meteor.log("Ping timeout");
170	andrew.betts	60	if (Meteor.mode != "smartpoll") {
171			Meteor.mode="smartpoll";
172			Meteor.callbacks["changemode"]("poll");
173			clearTimeout(Meteor.pingtimer);
174			Meteor.lastpingtime = false;
175			}
176	andrew.betts	53	Meteor.connect();
177	andrew.betts	32	},
178
179			process: function(id, channel, data) {
180			if (id == -1) {
181			Meteor.log("Ping");
182			Meteor.ping();
183	andrew.betts	53	} else if (typeof(Meteor.channels[channel]) != "undefined") {
184	andrew.betts	32	Meteor.log("Message "+id+" received on channel "+channel+" (last id on channel: "+Meteor.channels[channel].lastmsgreceived+")\n"+data);
185			Meteor.callbacks["process"](data);
186			Meteor.channels[channel].lastmsgreceived = id;
187			if (Meteor.mode=="smartpoll") {
188			var now = new Date();
189			Meteor.recvtimes[Meteor.recvtimes.length] = now.getTime();
190			while (Meteor.recvtimes.length > 5) Meteor.recvtimes.shift();
191			}
192			}
193			Meteor.setstatus(5);
194			},
195
196			ping: function() {
197			if (Meteor.pingtimer) {
198			clearTimeout(Meteor.pingtimer);
199			Meteor.pingtimer = setTimeout(Meteor.pollmode, Meteor.pingtimeout);
200			var now = new Date();
201			Meteor.lastpingtime = now.getTime();
202			}
203			Meteor.setstatus(5);
204			},
205
206			reset: function() {
207	andrew.betts	61	if (Meteor.status != 6 && Meteor.status != 0) {
208	andrew.betts	55	Meteor.log("Stream reset");
209			Meteor.ping();
210			Meteor.callbacks["reset"]();
211			var now = new Date();
212			var t = now.getTime();
213			var x = Meteor.pollfreq - (t-Meteor.lastrequest);
214			if (x < 10) x = 10;
215			setTimeout(Meteor.connect, x);
216			}
217	andrew.betts	32	},
218
219			eof: function() {
220	andrew.betts	55	Meteor.log("Received end of stream, will not reconnect");
221	andrew.betts	32	Meteor.callbacks["eof"]();
222	andrew.betts	55	Meteor.setstatus(6);
223	andrew.betts	53	Meteor.disconnect();
224	andrew.betts	32	},
225
226	andrew.betts	53	channelInfo: function(channel, id) {
227			Meteor.channels[channel].lastmsgreceived = id;
228			Meteor.log("Received channel info for channel "+channel+": resume from "+id);
229			},
230
231	andrew.betts	32	updatepollfreq: function() {
232			var now = new Date();
233			var t = now.getTime();
234			var avg = 0;
235			for (var i=1; i<Meteor.recvtimes.length; i++) {
236			avg += (Meteor.recvtimes[i]-Meteor.recvtimes[i-1]);
237			}
238			avg += (t-Meteor.recvtimes[Meteor.recvtimes.length-1]);
239			avg /= Meteor.recvtimes.length;
240			var target = avg/2;
241			if (target < Meteor.pollfreq && Meteor.pollfreq > Meteor.minpollfreq) Meteor.pollfreq = Math.ceil(Meteor.pollfreq*0.9);
242			if (target > Meteor.pollfreq && Meteor.pollfreq < Meteor.maxpollfreq) Meteor.pollfreq = Math.floor(Meteor.pollfreq*1.05);
243			},
244
245			registerEventCallback: function(evt, funcRef) {
246			Function.prototype.andThen=function(g) {
247			var f=this;
248			var a=Meteor.arguments
249			return function(args) {
250			f(a);g(args);
251			}
252			};
253			if (typeof Meteor.callbacks[evt] == "function") {
254			Meteor.callbacks[evt] = (Meteor.callbacks[evt]).andThen(funcRef);
255			} else {
256			Meteor.callbacks[evt] = funcRef;
257			}
258			},
259
260			frameloadtimeout: function() {
261			Meteor.log("Frame load timeout");
262			if (Meteor.frameloadtimer) clearTimeout(Meteor.frameloadtimer);
263			Meteor.setstatus(3);
264	andrew.betts	53	Meteor.pollmode();
265	andrew.betts	32	},
266
267			extract_xss_domain: function(old_domain) {
268			if (old_domain.match(/^(\d{1,3}\.){3}\d{1,3}$/)) return old_domain;
269			domain_pieces = old_domain.split('.');
270			return domain_pieces.slice(-2, domain_pieces.length).join(".");
271			},
272
273			setstatus: function(newstatus) {
274			// Statuses: 0 = Uninitialised,
275			// 1 = Loading stream,
276			// 2 = Loading controller frame,
277			// 3 = Controller frame timeout, retrying.
278			// 4 = Controller frame loaded and ready
279			// 5 = Receiving data
280	andrew.betts	55	// 6 = End of stream, will not reconnect
281	andrew.betts	32
282			if (Meteor.status != newstatus) {
283			Meteor.status = newstatus;
284			Meteor.callbacks["statuschanged"](newstatus);
285			}
286			},
287
288			log: function(logstr) {
289			if (Meteor.debugmode) {
290			if (window.console) {
291			window.console.log(logstr);
292			} else if (document.getElementById("meteorlogoutput")) {
293			document.getElementById("meteorlogoutput").innerHTML += logstr+"<br/>";
294			}
295			}
296			}
297			}
298
299			var oldonunload = window.onunload;
300			if (typeof window.onunload != 'function') {
301			window.onunload = Meteor.disconnect;
302			} else {
303			window.onunload = function() {
304			if (oldonunload) oldonunload();
305			Meteor.disconnect();
306			}
307			}