The "form page that gets user input" and the "validation page" are generated by the same script (and they may even have the same appearance on the client's browser), but they invoke different requests to that script -- they have different cgi parameters -- and the script behaves differently depending on which parameters have been supplied by the client.

From the client's point of view, it goes like this:

  1. client sends an http request to the server, using the url for your cgi script, and no parameters.
  2. server invokes your script (with no parameters) and this sends the client the html for a blank form.
  3. client fills in the form and hits the "submit" button; this sends an http request back to the server, using the url for your cgi script, and this time there are parameters attached (as specified in the form that the script created when it satisfied the first request)
  4. server invokes your script again (this time with the form parameters included, as filled out by the client/user)
  5. your script uses the new parameter data to validat the user, and if valid, does a redirect, rather than sending any html back to the client.

The point is that your one single cgi script does different things, depending on what the client is requesting.

In reply to Re^11: Redirecting values from 1 script to another by graff
in thread Redirecting values from 1 script to another by Nik

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.