CGI/examples/customize.cgi

#!/usr/local/bin/perl

use CGI qw(:standard :html3);

# Some constants to use in our form.
@colors=qw/aqua black blue fuschia gray green lime maroon navy olive
    purple red silver teal white yellow/;
@sizes=("<default>",1..7);

# recover the "preferences" cookie.
%preferences = cookie('preferences');

# If the user wants to change the background color or her
# name, they will appear among our CGI parameters.
foreach ('text','background','name','size') {
    $preferences{$_} = param($_) || $preferences{$_};
}

# Set some defaults
$preferences{'background'} = $preferences{'background'} || 'silver';
$preferences{'text'} = $preferences{'text'} || 'black';

# Refresh the cookie so that it doesn't expire.  This also
# makes any changes the user made permanent.
$the_cookie = cookie(-name=>'preferences',
             -value=>\%preferences,
             -expires=>'+30d');
print header(-cookie=>$the_cookie);

# Adjust the title to incorporate the user's name, if provided.
$title = $preferences{'name'} ?
    "Welcome back, $preferences{name}!" : "Customizable Page";

# Create the HTML page.  We use several of Netscape's
# extended tags to control the background color and the
# font size.  It's safe to use Netscape features here because
# cookies don't work anywhere else anyway.
print start_html(-title=>$title,
         -bgcolor=>$preferences{'background'},
         -text=>$preferences{'text'}
         );

print basefont({SIZE=>$preferences{size}}) if $preferences{'size'} > 0;

print h1($title),<<END;
You can change the appearance of this page by submitting
the fill-out form below.  If you return to this page any time
within 30 days, your preferences will be restored.
END
    ;

# Create the form
print hr(),
    start_form,

    "Your first name: ",
    textfield(-name=>'name',
          -default=>$preferences{'name'},
          -size=>30),br,

    table(
      TR(
         td("Preferred"),
         td("Page color:"),
         td(popup_menu(-name=>'background',
               -values=>\@colors,
               -default=>$preferences{'background'})
        ),
         ),
      TR(
         td(''),
         td("Text color:"),
         td(popup_menu(-name=>'text',
               -values=>\@colors,
               -default=>$preferences{'text'})
        )
         ),
      TR(
         td(''),
         td("Font size:"),
         td(popup_menu(-name=>'size',
               -values=>\@sizes,
               -default=>$preferences{'size'})
        )
         )
      ),

    submit(-label=>'Set preferences'),
    hr;

print a({HREF=>"/"},'Go to the home page');
print end_html;