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Telnet emulation with Javascript/dhtml


Does anyone have code they could share that would implement a telnet
session in a browser using Javascript? I've seen it done once, but they
did not have code available. This would be integral to preserving some
old telnet-based software but allowing us to move on with web-only code
at this point.

Thank you in advance to anyone who can assist.

(Ideally, it should be cross-browser, of course).

Rick

Aug 10 '05 #1
6 17156
"Questman" <qu******@UBESU Xthemajorbbs.co m> kirjoitti
viestissä:fA*** **************@ fe80.usenetserv er.com...

Does anyone have code they could share that would implement a telnet
session in a browser using Javascript? I've seen it done once, but they
did not have code available. This would be integral to preserving some
old telnet-based software but allowing us to move on with web-only code at
this point.

Thank you in advance to anyone who can assist.

(Ideally, it should be cross-browser, of course).

Java Applet might be what you need. Javascript does not provide such
functionality unless... Hmm. You could possibly make an AJAX/CGI application
which would use a serverside script to telnet and javascript/xmlRequest to
display the output to the client. Still, I'd start making a Java Applet for
that if I were you.

--
SETI @ Home - Donate your cpu's idle time to science.
Further reading at <http://setiweb.ssl.ber keley.edu/>
Kimmo Laine <et************ ****@5P4Mgmail. com>
Aug 10 '05 #2
Kimmo Laine wrote:
"Questman" <qu******@UBESU Xthemajorbbs.co m> kirjoitti
viestissä:fA*** **************@ fe80.usenetserv er.com...
Does anyone have code they could share that would implement a telnet
session in a browser using Javascript? I've seen it done once, but they
did not have code available. This would be integral to preserving some
old telnet-based software but allowing us to move on with web-only code at
this point.

Thank you in advance to anyone who can assist.

(Ideally, it should be cross-browser, of course).


Java Applet might be what you need. Javascript does not provide such
functionality unless... Hmm. You could possibly make an AJAX/CGI application
which would use a serverside script to telnet and javascript/xmlRequest to
display the output to the client. Still, I'd start making a Java Applet for
that if I were you.


For that matter, if it isn't something that needs intervention, set up a
server-side script (php, asp, etc.) to accept the data that will be sent
via post or something, and have the script execute all the necessary
actions.

--
Justin Koivisto, ZCE - ju****@koivi.co m
http://koivi.com
Aug 10 '05 #3
Kimmo Laine wrote:

Java Applet might be what you need. Javascript does not provide such
functionality unless... Hmm. You could possibly make an AJAX/CGI application
which would use a serverside script to telnet and javascript/xmlRequest to
display the output to the client. Still, I'd start making a Java Applet for
that if I were you.


Hi Kimmo,

The problem with an Applet is that many browsers turn off the
functionality for "security" or performance reasons.

Ideally, the goal to get javascript functionality is to have a stock
browser be able to access this content.

Unfortunately, it also needs interaction...

Here's an example of what I'm talking about doing :

http://www.port42.com/

I've tried contacting these blokes but they do not respond..
So I now wish to develop my own version, but don't really know where to
start.

Rick

Aug 11 '05 #4
"Questman" <qu******@UBESU Xthemajorbbs.co m> kirjoitti
viestissä:a8*** ***********@fe0 7.usenetserver. com...
Kimmo Laine wrote:

Java Applet might be what you need. Javascript does not provide such
functionality unless... Hmm. You could possibly make an AJAX/CGI
application which would use a serverside script to telnet and
javascript/xmlRequest to display the output to the client. Still, I'd
start making a Java Applet for that if I were you.


Hi Kimmo,

The problem with an Applet is that many browsers turn off the
functionality for "security" or performance reasons.

Ideally, the goal to get javascript functionality is to have a stock
browser be able to access this content.


Dude, people turn of Javascript as well. That's like saying you don't like
Britney Spears but do like Christina Aguilera because Britney is a stupid
cow. They're both stupid cows! If you want to really have any given browser
to be able to handle it, using javascript is not going to help you at all.
With both of them you are between a rock and a hard place.

The ultimate solution would be to do it like a chat, where you have two
frames: large top and one row bottom. You type the commands in the bottom
frame and submit it, and the output appears in the top frame if it's done
like a chat page. Then the bottom frame just reloads.

How to do the chat page? You gotta use sme server side programming. The key
is open the page, but never close it. Keep on streaming the output, send
some spaces every now and then to keep the connection alive and poll for new
output. When new output appears like maybe in a text file, stream the
textfile and delete it. Then start polling again if new text has a ppeared.
That's like the stupidest thing I've ever written, but it's the solution
that should work in just about any given browser.

Here's a pseudo code

This for the telnet output :

start_telenet_s ession {
do while(true) {
output_availabl e = poll textfile
if(output_avail able) {
print output
clear textfile
} else {
sleep 1 second
print " "
}
}
}
This is for the bottom frame :

command_recieve d {
execute command
write command output to textfile
reload same page
}

--
SETI @ Home - Donate your cpu's idle time to science.
Further reading at <http://setiweb.ssl.ber keley.edu/>
Kimmo Laine <et************ ****@5P4Mgmail. com>
Aug 11 '05 #5
Yeah there is a open source project that is based off of the work at
http://sarissa.sourceforge.net/ it is called AnyTerm I believe they
even support SSH. http://anyterm.org/

good luck

Aug 11 '05 #6
Nathan White wrote:
Yeah there is a open source project that is based off of the work at
http://sarissa.sourceforge.net/ it is called AnyTerm I believe they
even support SSH. http://anyterm.org/

good luck


THIS IS EXACTLY WHAT I NEEDED.

Thank you, Nathan.

Thanks to those who responded - it is much appreciated.

Rick

Aug 11 '05 #7

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