Yes, that's wrong. You can use the XMLHttpRequest's open method to open a connection to a URL (including port #) and wait for a response. The default is to do it "asynchronously" (it's asynchronous to the client code) and process state change via the onreadstatechange event [1]. See http://msdn.microsoft.com/library/default.asp? url=/workshop/author/dhtml/reference/methods/open.asp for the documentation of the open method.
see http://support.microsoft.com/kb/290591 for example of client accessing classic ASP server (with implementation) with XmlHTTPRequest. See http://support.microsoft.com/kb/893659 for example of client accessing ASP.NET Web Service with XmlHTTPRequest. [1] http://msdn.microsoft.com/library/default.asp? url=/workshop/author/dhtml/reference/properties/onreadystatechange_1.asp -- Peter On Thu, 25 Jan 2007 12:58:38 -0500, Peter Vertes <[EMAIL PROTECTED]> wrote: >Thanks for the quick response Peter. What I meant by the line "...with AJAX >you can't have an open socket" is that I don't think it is possible for me >to connect to a remote machine on a specific port and wait for updates on >that port to come. Am I wrong in assuming this ? > >-Pete > >P.S.: Thanks for the XMLHttpRequest article; I'll take a look at it... > >On 1/25/07, Peter Ritchie < >[EMAIL PROTECTED]> wrote: >> >> What do you mean by "...with AJAX you can't have an open socket"? Without >> opening a socket AJAX can't do much. >> >> At the lowest level AJAX uses an XMLHttpRequest object (in IE6, this *is* >> technically using an ActiveX object) in the client-side Javascript to open >> a connection to a server to get an XML response. The client-side then >> processes that XML to update objects in the DOM. see >> http://www.xml.com/pub/a/2005/02/09/xml-http-request.html for an overview >> of the low-level process. >> >> Atlas for ASP.NET wraps all this up in their interface and utility >> classes/js files. >> >> So far, you haven't described anything that you couldn't do with AJAX. >> Keep in mind the server doesn't respond with HTML with an AJAX request... >> >> On Thu, 25 Jan 2007 12:14:09 -0500, Peter Vertes <[EMAIL PROTECTED]> >> wrote: >> >> > I've been presented with an interesting project but after doing some >> >research into it I believe it is impossible to do with the requirements >> >given by the client. The client would like to stream data to a webpage >> and >> >the webpage should display the updates delivered by the data as close to >> >real-time as possible. For instance imagine a DataGrid that has 10 >> ticker >> >symbols in it. Whenever the price changes for a symbol the backend >> pushes >> >the changed prices and symbols into a DataSet and the DataGrid (which is >> >bound to the DataSet) shows the updated prices. The requirements of the >> >client are that the users should not have to download/install anything >> onto >> >their computers and no ports should be needed to be opened on the >> firewall >> >besides ports 80. I've been doing some research into this but I'm not >> >getting too far. I've tried opening a socket from ASP.NET but I can't >> get >> >updates without a refresh to the page. I've looked into an AJAX solution >> >but with AJAX you can't have an open socket. To be honest I think the >> only >> >way this could be possibly done is either via a Java applet or with some >> >ActiveX component (although I'd prefer Java over ActiveX programming). >> >Before I told the client that besides a Java Applet solution the project >> >could not be done I thought I'd check with the list and ask for opinions >> or >> >other words of wisdom. Am I right by thinking this can only be done with >> a >> >Java applet or is there another solution out there that I haven't >> explored >> >? Better yet; has anyone done anything like this before ? Thanks for >> all >> >ideas/comments in advance... >> >> =================================== >> This list is hosted by DevelopMentor(r) http://www.develop.com >> >> View archives and manage your subscription(s) at >> http://discuss.develop.com >> > >=================================== >This list is hosted by DevelopMentor® http://www.develop.com > >View archives and manage your subscription(s) at http://discuss.develop.com =================================== This list is hosted by DevelopMentor® http://www.develop.com View archives and manage your subscription(s) at http://discuss.develop.com
