Get variables into an HTTP page?

[Todd Reed]

I use the following script to get two of my Ocelot variables, and OSD them, and write them to a text file.



Ocelot:GetVariables(function()

filedirectory = "c:\\My Documents\\"
filename = "OcelotTempLog.txt"
saveasname = filedirectory .. filename
fout = io.open(saveasname,'a+')

local data={}
airtemp=ADI.Var[8]
h2otemp=ADI.Var[7]
osd.StatusMessage("Air = "..ADI.Var[8] .."\n".."Water = "..ADI.Var[7])
d=os.date("%b %d %X %p")
fout:write(d .. " " .. airtemp .. " " .. h2otemp .. "\n")

print (d);
print (airtemp);
print (h2otemp);

fout:close()
end)


How would I get these to show up on a webserver HTML page when it is opened?

Thanks!

[Ron]

Would this be the built in webserver? If so then just put lua script in the webpages. Have a look at the manual page for the webserver, it has examples. For example the Girder 5 DM webpages use this extensively.

[Todd Reed]

Maybe like this?



<%
Ocelot:GetVariables(function() Print ("Airtemp = "..ADI.Var[8] end)
%>

[Ron]

Close! print actually prints to the lua console not the webpage.


<%
Ocelot:GetVariables(function() webserver:print ("Airtemp = "..ADI.Var[8] end)
%>

[Todd Reed]

Actually, after 45 minutes... this worked!



<%
Ocelot:GetVariables(function() end)
webserver:print("<H2>".." Current Air Temperature is = "..ADI.Var[8].."</H2>")
%>


Any tips on formating and concatenating using webserver:print?

[hoox]

Todd,

Note that you'll have to put a delay in there or it will display old values...

<%
ADI.Var[8] = 'Unknown'
Ocelot:GetVariables(function() end)

local i = 0
while ADI.Var[8] == 'Unknown' and i < 3 do
win.Sleep(700)
i = i+1
end

webserver:print("<H2>".." Current Air Temperature is = "..ADI.Var[8].."</H2>")
%>

[Todd Reed]

Thanks, I could not get it to work with "webserver:print" inside the "end" statement, and when I took it out, then it displayed, but in fact it may be old data.

[Ron]

That seems like an odd way to do things. Is there no other way to get the data? Blocking a webpage for 700ms is an eternity and will not scale very well :-)

[Todd Reed]

I could not get the "webserver: print" to work inside the function/end statements. I will try a few more things... But checking again, it seems to be up to date! Maybe it updates, before the "end" statement, before it continues to next line??

Maybe Hoox and Ron can review the Ocelot:GetVariables function inside the Serial plugin. There may be a better way!!

:)

[hoox]

Unfortunately, I have no idea how GetVariables could return the values, without blocking Girder during the time that the reponse is pending.
The callback function is used to avoid this with most Girder scripts, but it won't work with the webserver.

You could try making periodic Ajax requests, but I don't know if it's easy to do...

[Ron]

Ajax is not hard. Check out my examples in the httpd directory.

[Todd Reed]

:o

Okay, 45 minutes to figure out my solution so far is... well, kinda hard....! :(

I consider myself decent in HTML and without a full manual, the AJAX looks totally Greek!
Or should I say GEEK! (At least that's what my kids call me :))

So which example file would help us the most? G5 or G4 directory?

[Ron]

Have a look at the httpd directory in the Girder directory. You'll find several HTML files there. If you look at events.html it shows you how to send events to Girder from HTML using AJAX. Hopefully this will get you started. Javascript is not too bad, just use a browser that gives you feedback on errors. I really like to use Firefox for that. Though IE has an addition somewhere that allows you to debug pages as well. Best thing as always is to have specific questions :-)