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Have CGI call script, display status in browser

by Anonymous Monk
on Mar 14, 2002 at 13:18 UTC ( #151659=perlquestion: print w/ replies, xml ) Need Help??
Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

How do I run a perl script from a submit button in a (CGI) HTML page and send the output to another html page. Tried using 'system' but the script does not run.

Title edit by tye as single-word titles interfere with future simple searches

Comment on Have CGI call script, display status in browser
Re: Gez
by Biker (Priest) on Mar 14, 2002 at 13:25 UTC

    You want to keep the old window in place? Sorry, but you'll have to do this with JavaScript.


    Everything will go worng!

Re: Gez
by dash2 (Hermit) on Mar 14, 2002 at 13:29 UTC
    Sounds like you've got a misunderstanding.

    Point the form you are submitting to the cgi script you want to run. E.g. <form action='foobar.cgi' method='post'>

    Then make the script parse the form inputs and print out an HTML page. E.g.

    #!/usr/bin/perl -w # this is foobar.cgi use strict; # untested use CGI; my $cgi = new CGI; print $cgi->header, $cgi->start_html; print "You entered " . $cgi->param('form_input_name') . "<br>"; print $cgi->end_html; exit;

    No need to use system. dave hj~

      Sorry, I should have been more specific The perl script I am trying to start from a submit button, creates text files based on data read from a database, then saves these files to disk. Its output just prints 'RUNNING', and 'COMPLETE' to STDOUT, which in this case needs to be an HTML form so that I know the status of the perl script

        which in this case needs to be an HTML form so that I know the status of the perl script

        First, output 512 bytes to make browsers render. Some browsers will never render until the page is loaded completely (like Konqueror), but this works with at least Mozilla and MSIE.
        Then, start outputting.

        It's a very good idea to set $| to 1, to avoid all buffering. You could use javascript to make it look good.

        #!/usr/bin/perl -w use strict; $|++; sub set_status { my ($status) = @_; print '<script> document.getElementById("status").innerHTML = "' . $status . '"; </script>"'; } print qq{Content-Type: text/html\n <html><body><div style="font-size:288pt;"> Current status: <div id=status>Initialising</div> <!-- }, "Z" x 512, q{ --> </div></body></html> }; sleep 2; set_status 'RUNNING'; sleep 5; set_status 'COMPLETE';

        U28geW91IGNhbiBhbGwgcm90MTMgY
        W5kIHBhY2soKS4gQnV0IGRvIHlvdS
        ByZWNvZ25pc2UgQmFzZTY0IHdoZW4
        geW91IHNlZSBpdD8gIC0tIEp1ZXJk
        

Re: Gez
by erikharrison (Deacon) on Mar 14, 2002 at 13:35 UTC

    Your question is not very clear. The preceeding comments are acurate, but I'm not sure they answer your question.

    If you mean "How can a CGI program send data to another CGI program" there are a couple of ways. I think the solution you are looking for is to simply point the HTML page to the second script - this is assuming that you are trying ot run a CGI from a different server. This is probably a no-no however, simply because the original author could change that program, and your HTML page would send him/her bad data - which might actually do something.

    Cheers,
    Erik
      Sorry, I should have been more specific The perl script I am trying to start from a submit button, creates text files based on data read from a database, then saves these files to disk. Its output just prints 'RUNNING', and 'COMPLETE' to STDOUT, which in this case needs to be an HTML form so that I know the status of the perl script

        Ahhh . . . I see. Perl, in this fashion, is a server side technology. What you need is a client side technology like JavaScript (Though you can still use Perl server side). See cgi buffer flush for a more detailed discussion.

        Cheers,
        Erik
Re: Have CGI call script, display status in browser
by dug (Chaplain) on Mar 14, 2002 at 18:27 UTC
    It sounds like this may be a good place to use merlyn's method that he wrote up in his "search in progress" WebTechniques article.
    It is a good explination of how to get a request, fork a process to do your heavy work, redirect the browser to a status file that the kid updates until it's done with its slave labor.

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