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#!/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;
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