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Re: [vox-tech] cgi question
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Re: [vox-tech] cgi question

  • Subject: Re: [vox-tech] cgi question
  • From: Micah Cowan <micah@cowanbox.coMAPSm>
  • Date: Thu, 21 Dec 2000 11:01:14 -0800
  • References: 20001221094230.A9190@dirac.org

On Thu, Dec 21, 2000 at 09:42:30AM -0800, Peter Jay Salzman wrote:
> dear all,
> i have a form page (form.html) -- the user enters data and it calls a cgi
> script (cgi1.pl).
> the cgi script saves the data to a file.
> at this point i would like to put up a map, have the user click on it and
> save the (x,y) value to the file that cgi1.pl just wrote.
> what's the best way to do that?  at this point, i have two options:
> 1. have cgi1.pl put the map up after it saves the datafile.  i'm not sure
>    how to collect the (x,y) data.

There are two ways to collect the x,y data.

1) Use a regular image map.  This means you just put the image in an
anchor ("A" element) and make sure and put the ismap attribute in (use
ismap="ismap" to be XHTML compliant - but that may break some
browsers).  The coordinates will be passed by attaching "?10,20" or
whatever to the anchor's url.

2) You can use the <input type="image"> construct in a form, in which
case the coordinates will be passed depending on the control's name.
For instance, if you do something like <input type="image"
src="foo.gif" alt="an image" name="foo"> (actually, in HTML 4.0 you
are supposed to use id="foo" rather than name="foo").  The coordinates
will be passed attaching something like foo.x=10&foo.y=20 - you get
the idea.

> 2. have cgi1.pl call another webpage that puts the map up and collects the
>    (x,y) data.   the html page will have to call another cgi script to
>    write the coordinate data, but i'm not sure how to make the new cgi "know"
>    which data file we just wrote to.

You will need to generate the webpage from the cgi, rather than redirect
to another.  Put the coordinate data somewhere in hidden fields in the
form which calls the new cgi, or attach it directly as query strings
to any anchor tags which call the new cgi.

> this is the first time i've ever seriously played around with cgi.  any
> guidance would be really appreciated!
> pete



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