RE: How to save the state of a CGI script
From: Randal L. Schwartz [mailto:[EMAIL PROTECTED] Ankur == Ankur Gupta [EMAIL PROTECTED] writes: Ankur a.cgi calls b.cgi through POST method. Why? Why? CGI is a protocol that permits a server to launch a process to handle a browser hit. YOU SHOULD NOT HAVE CGI calling EACH OTHER. Hi Randal, Let me rephrase. I call http://127.0.0.1/a.cgi . This reads a file and based on it creates a form with select list, popups, text boxes, etc. and a submit button. Now this generated html page will call http://127.0.0.1/b.cgi if I click on the submit button and pass the various parameters using POST method. I am able to collect the parameters in b.cgi and based on it I am creating a table(html). Now I want to sort the table on different columns(Details already provided in my earlier mail). I hope I am clear this time. :( --Ankur Emacs is a nice operating system, but I prefer UNIX. - Tom Christiansen -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Re: How to save the state of a CGI script
On Sat, May 28, 2005 at 09:57:55PM +0530, Ankur Gupta wrote: I read perldoc CGI and found that state of a script could be saved by the following function. $myself = $query-self_url; print q(a href=$myselfI'm talking to myself./a); Not quite. If you used qq so that the string would interpolate variables then it would create a link back to the current URL - including the query string. print $q-start_form(-method='POST', You cannot create POST requests using a hyperlink, in HTML the only way to set this up is with a form. Additionally, since the data not sent using the query string then simply reading the query string won't include the same values. You would need to loop through the posted data and generate form controls (such as hidden inputs) for each value. Since the rest of your message discusses sorting of data, you should consider that GET is supposed to be used when retrieving any information from the server and POST when you are changing something. (This has implications such as GET being bookmarkable, and POST causing most browsers to warn about resubmitting data). -- David Dorward http://dorward.me.uk -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
RE: How to save the state of a CGI script
From: David Dorward,,, [mailto:[EMAIL PROTECTED] On Behalf Of On Sat, May 28, 2005 at 09:57:55PM +0530, Ankur Gupta wrote: I read perldoc CGI and found that state of a script could be saved by the following function. $myself = $query-self_url; print q(a href=$myselfI'm talking to myself./a); Not quite. If you used qq so that the string would interpolate variables then it would create a link back to the current URL - including the query string. print $q-start_form(-method='POST', You cannot create POST requests using a hyperlink, in HTML the only way to set this up is with a form. Additionally, since the data not sent using the query string then simply reading the query string won't include the same values. You would need to loop through the posted data and generate form controls (such as hidden inputs) for each value. Since the rest of your message discusses sorting of data, you should consider that GET is supposed to be used when retrieving any information from the server and POST when you are changing something. (This has implications such as GET being bookmarkable, and POST causing most browsers to warn about resubmitting data). Thanks a lot guys for the help. I guess I have to use hidden fields. BTW, I am using POST just because there is no restriction on the length of the query string which I am passing to the cgi script. I read that GET has a max value but POST does not. Am I right? I have no reservations against using GET but only because it has max length. My query string can be way too long that's way I am using POST. --Ankur Where does the family start? It starts with a young man falling in love with a girl - no superior alternative has yet been found. - Guess what, my ideas match with Sir Winston Leonard Spencer Churchill -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
RE: How to save the state of a CGI script
Ankur Gupta mailto:[EMAIL PROTECTED] wrote: : Thanks a lot guys for the help. I guess I have to use hidden fields. You could also use a session cookie. HTH, Charles K. Clarkson -- Mobile Homes Specialist 254 968-8328 -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
RE: How to save the state of a CGI script
From: Charles K. Clarkson [mailto:[EMAIL PROTECTED] Ankur Gupta mailto:[EMAIL PROTECTED] wrote: : Thanks a lot guys for the help. I guess I have to use hidden fields. You could also use a session cookie. Hi Charles, I am fairly new to use the CGI module. So I would like to know how a cookie would be different from a hidden field. I mean that I can store all the parameters in the cookie but how can I pass the parameters to the CGI script. --Ankur Software engineer: One who engineers others into writing the code for him/her. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
RE: How to save the state of a CGI script
Ankur Gupta mailto:[EMAIL PROTECTED] wrote: : Hi Charles, Hi. : I am fairly new to use the CGI module. So I would like to know : how a cookie would be different from a hidden field. Take a look at this page. It is a general discussion about shopping cart scripts. It gives a decent introduction to both techniques. http://ironbark.bendigo.latrobe.edu.au/subjects/CN/2004/lectures/l20.d/Lect2 0.html : I mean that I can store all the parameters in the cookie but : how can I pass the parameters to the CGI script. HTTP cookies are covered near the end of the CGI.pm docs. You may not want to hold *every* value in the cookie. Sometimes you use the cookie to point to (sensitive) data on the server. Take a look at CGI::Session. It has a tutorial with it, CGI::Session::Tutorial. HTH, Charles K. Clarkson -- Mobile Homes Specialist 254 968-8328 -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Re: How to save the state of a CGI script
Ankur == Ankur Gupta [EMAIL PROTECTED] writes: Ankur a.cgi calls b.cgi through POST method. I am collecting all the parameters Ankur using the param function. Ankur b.cgi draws a table based on the input from a.cgi's form. Ankur The table's row are initially sorted by first column. It is desired that I Ankur can sort the same table by different columns by just clicking on the heading Ankur of the column. Ankur I read perldoc CGI and found that state of a script could be saved by the Ankur following function. Ankur [...] Ankur $myself = $query-self_url; Ankur print q(a href=$myselfI'm talking to myself./a); Ankur self_url() will return a URL, that, when selected, will reinvoke this script Ankur with all its state information intact. This is most useful when you want to Ankur jump around within the document using internal anchors but you don't want to Ankur disrupt the current contents of the form(s). Something like this will do the Ankur trick. Ankur $myself = $query-self_url; Ankur print a href=\$myself#table1\See table 1/a; Ankur print a href=\$myself#table2\See table 2/a; Ankur print a href=\$myself#yourself\See for yourself/a; Ankur [...] Ankur But I do not want to jump around the page but change the order of the file. Ankur I tried this stupid thing and it did not work. Ankur my $myself = $q-self_url; Ankur print $q-start_form(-method='POST', Ankur -action=$myself); Ankur I also read that the parameters can be saved into a file. I tried saving the Ankur parameters and it worked. Ankur But how do I use that information so that I can pass its contents to the Ankur same file. Ankur Kindly help Ankur PS: Earlier I was using GET method and I had one or two parameters to pass. Ankur So I was able to sort on different columns passing the list explicitly. Ankur --Ankur Ankur Whatever games are played with us, we must play no games with ourselves. - Ankur Ralph Waldo Emerson -- Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095 merlyn@stonehenge.com URL:http://www.stonehenge.com/merlyn/ Perl/Unix/security consulting, Technical writing, Comedy, etc. etc. See PerlTraining.Stonehenge.com for onsite and open-enrollment Perl training! -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
Re: How to save the state of a CGI script
Ankur == Ankur Gupta [EMAIL PROTECTED] writes: Ankur a.cgi calls b.cgi through POST method. Why? Why? CGI is a protocol that permits a server to launch a process to handle a browser hit. YOU SHOULD NOT HAVE CGI calling EACH OTHER. :-( -- Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095 merlyn@stonehenge.com URL:http://www.stonehenge.com/merlyn/ Perl/Unix/security consulting, Technical writing, Comedy, etc. etc. See PerlTraining.Stonehenge.com for onsite and open-enrollment Perl training! -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
How to save the state of a CGI script
Hi, I am using CGI module. a.cgi calls b.cgi through POST method. I am collecting all the parameters using the param function. b.cgi draws a table based on the input from a.cgi's form. The table's row are initially sorted by first column. It is desired that I can sort the same table by different columns by just clicking on the heading of the column. I read perldoc CGI and found that state of a script could be saved by the following function. [...] $myself = $query-self_url; print q(a href=$myselfI'm talking to myself./a); self_url() will return a URL, that, when selected, will reinvoke this script with all its state information intact. This is most useful when you want to jump around within the document using internal anchors but you don't want to disrupt the current contents of the form(s). Something like this will do the trick. $myself = $query-self_url; print a href=\$myself#table1\See table 1/a; print a href=\$myself#table2\See table 2/a; print a href=\$myself#yourself\See for yourself/a; [...] But I do not want to jump around the page but change the order of the file. I tried this stupid thing and it did not work. my $myself = $q-self_url; print $q-start_form(-method='POST', -action=$myself); I also read that the parameters can be saved into a file. I tried saving the parameters and it worked. But how do I use that information so that I can pass its contents to the same file. Kindly help PS: Earlier I was using GET method and I had one or two parameters to pass. So I was able to sort on different columns passing the list explicitly. --Ankur Whatever games are played with us, we must play no games with ourselves. - Ralph Waldo Emerson -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] http://learn.perl.org/ http://learn.perl.org/first-response
