javascript - SignalR - Unable to get property 'client' of undefined or null reference -
i having problems using signalr in existing web application. receiving javaruntime exception "unable property 'client' of undefined or null reference" because when try retrieve hub $.connection object, returning null.
before post code, wanted supply background , things have tried: - if run project locally, works fine. when deploy project iis location have issues. - have verified hub name correctly camel cased. again, works fine locally, , throws error after have deployed project iis. - have confirmed javascript has loaded. jquery library referenced once, , loads fine. signalr javascript, , dynamically created signalr/hubs. - if create new project, , run same code new web application running web app under existing web application, works fine (same code being used, in new project).
anyone have thoughts on problem is?
hub code:
imports microsoft.aspnet.signalr public class testhub inherits hub public sub connect() try clients.caller.onconnect(context.connectionid) catch ex exception logmessage("error connecting hub", 0, 0, "error") end try end sub end class web page code:
<html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <script src="scripts/jquery-1.6.4.min.js"></script> <!--reference signalr library. --> <script src="scripts/jquery.signalr-1.1.3.js"></script> <!--reference autogenerated signalr hub script. --> <script src="signalr/hubs"></script> <script type="text/javascript"> $(function () { // declare proxy reference hub. var thub = $.connection.testhub; registerclientmethods(thub); // start hub $.connection.hub.start().done(function () { registerevents(thub); thub.server.connect(); alert('connected!'); }); }); function registerclientmethods(thub) { thub.client.onconnect = function (id) { $('#lblconnectionid').text(id); } } function registerevents() { } </script> </head> <body> <form id="form1" runat="server"> <div> <asp:label id="lblconnectionid" runat="server" /> </div> </form> </body> </html> global.asax code:
imports system.web.routing imports microsoft.aspnet.signalr public class global_asax inherits system.web.httpapplication sub application_start(byval sender object, byval e eventargs) ' fires when application started try ' register default hubs route: ~/signalr/hubs routetable.routes.maphubs() catch ex exception logmessage("error initializing signalr: " & ex.message, 0, 0, "error") end try end sub ... so now, when go page signalrtest.aspx, line thub.client.onconnected = ... throws javascript error: "unable property 'client' of undefined or null reference"
does know might causing this? thank you.
[edit] - after comparing working signalr/hubs.js file non-working file, found following piece missing:
proxies.testhub= this.createhubproxy('testhub'); proxies.testhub.client = { }; proxies.testhub.server = { connect: function () { return proxies.transactionhub.invoke.apply(proxies.testhub, $.merge(["connect"], $.makearray(arguments))); } }; any thoughts on why not included in signalr/hubs.js file? calling maphubs() in global.asax...
thanks!
[fix] deleted bin folder of destination web application, , redeployed. still not sure different. .dlls same. works though. odd.
i encountered error when trying debug run web application after publishing vs 2012 iis 7.5. after hair pulling, realised problem fact did not change jquery script , signalr paths when deploying.
to solve issue had add virtual directory name ("testingchat") path of script tags jquery , signalr.
e.g. this:
<script src="scripts/jquery-1.8.2.min.js" ></script> <script src="/signalr/hubs"></script> to
<script src="/testingchat/scripts/jquery-1.8.2.min.js" ></script> <script src="testingchat/signalr/hubs"></script> 
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