Posting from form to server using AJAX

[Tim Johnson]

I'm an experienced web/CGI programmer, but new to ajax.
I'd like to review some examples of how to post data from a
form to server using AJAX. I have already created some examples
successfully that read data from a server to a form using
'get' as the first argument to the open() method

Also:
I have a client who wants to post some very large forms using
AJAX, but I'm concerned about the limits of the size of the
argument to the send() method of an ajax object.
I presume that I will need to write javascript code that 'walks'
thru form elements and concatenates a string in the
follow format var1=val1&var2= val2...... escaping as necessary.

My concern is that the form may have as many as 600 fields!
I'd welcome both simple examples to get started and comments
on whether there is a limit on the size of the send() method argument string.
Thanks
Tim

[acoder]

Welcome to TSDN!

Here's an example to get you started.

I'm not sure about the limits. Give it a try and see how it goes.

[Dasty]

You should care about size limits only with sending "get" requests. Sending "post" requests are not limited by protocol spec. The only limit I can see is javascript string limit, but not technology itself. Anyway 600 items are far from limits, so dont worry. (I was using strings up to 100Mb long when I was tring memory leeks in IE)

If you want to send such a huge forms, you should write function to serialize them into string, like "AjaxRequest.se rializeForm" one here: http://www.ajaxtoolbox.com/request/source.php

Check it out ...

[acoder]

If you want to send such a huge forms, you should write function to serialize them into string, like "AjaxRequest.se rializeForm" one here: http://www.ajaxtoolbox.com/request/source.php

Yes, a nice and compact function and using encodeURICompon ent instead of escape.

[Tim Johnson]

Thanks to all for the replies. This is going to get me started.
I will go over all code examples later today.
:-)And unless I get *really* lucky, you will hear from
me again.
Cheers
Tim

[Tim Johnson]

Just wanted to add:
Documentation and examples for this are:
Here
Tim

[acoder]

Thanks to all for the replies. This is going to get me started.
I will go over all code examples later today.
:-)And unless I get *really* lucky, you will hear from
me again.

OK, no problem. Let us know how you get along.

[Tim Johnson]

It looks like AjaxRequest.js is an industrial-strength module and
is just what I need.
But I have a related question:
I think it is going to be more productive to have a custom
server application running on the server side.
I'm a python programmer (among other PLs) and I'm looking at
the documentation for the CGIHTTPServer module, which would
do most of the heavy lifting for such a customer server.

There is documentation for this module Here
and there are references there to an inability to handle redirects
via http 302. Could this be a problem?
thanks
Tim

[acoder]

There is documentation for this module Here
and there are references there to an inability to handle redirects
via http 302. Could this be a problem?

I think this question would be better suited to the Python forum.

[Tim Johnson]

You're correct. Poorly posed question....
I guess my question should have been
What's http 302?
And how relevant is it to ajax?
and I can google that.
Thanks
Tim