Posted by Ed Jay on 12/17/97 11:31

I generate a page using a Perl script ("Page 1"). The page has a
multi-question form that is submitted to a second Perl script that creates
the next page ("Page 2").

Page 1 has a couple of questions that assigns values (0 or 1) to variable
$A and to variable $B. $A and B$ cannot each have the value 1. I'm trying
to trap the potential input error that results in $A = $B = 1.

Clearly I can submit the form values to Page 2 and have Page 2 test for
the error, print an error message and have the operator press a button to
return to Page 1. IOW, read all variables sent from Page 1, test for the
error, and if the error exists use a form to resubmit the form to
Page 1, otherwise continue to process Page 2, as follows:

E.g.,

Submit Page 1 variables to Page 2
Page 2 reads in variables from Page 1
if ($A && $B != 1) {process Page 2} #then goto Page 3
else {
print the error message
<FORM ACTION=cgi-bin/page_1.cgi\" METHOD=\"POST\">
<input type=submit value="Press here to go back to Page 1">
}

I'd prefer to have the form automatically proceed back to Page 1 if
there's an error instead of having the op press another button..

Two questions:

1. How can I either test the error while still on Page 1?

2. How do I test for the Page 1 error on Page 2 and automatically return
the op to Page 1 for corrections?

Thanks.

--
Ed Jay (remove M to respond by email)

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