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Complete shopping cart demo - using CGI.pm
Using CGI.pm example from a Well House Consultants training course
More on Using CGI.pm [link] Source code: cgi_shoppingcart.pl Module: P412
#!/usr/bin/env perl
# Basic framework of a CGI.pm shopping cart script following the # suggested design techniques in Well House Consultants module P412 # This script uses nonpersistant cookies, so that you can close # and re-start your browser to test it. You must provide a subdirectory # called "session" which is writeable by the web server. # Additions to make later: Order editing, order completion via checkout. use CGI; collect_form(); add_cart(); do_work(); save_cart(); send_results(); ################################################################## sub collect_form { $q = new CGI; $sess = $q -> cookie("sess"); if (! $sess ) { $action = 1; # Send initial form $sess = $$."_".time(); $setstring = $q -> cookie (-name => "sess", -path => "/", -value => $sess); $q -> param(-name => "key",-value => $setstring); } else { if (open (FH,"session/$sess")) { @names = $q -> param(); while ($name = pop @names) { $val = $q -> param($name); $fromform{$name} = $val; } $q = new CGI(\*FH); close FH; $action = $q -> param("action") || 2; } else { $action = 2; } } } sub add_cart { foreach $i (keys %fromform) { $q -> param(-name => $i,-value => $fromform{$i}); } } sub save_cart { # Save away the next action! $q -> param(-name => "action",-value => $action); open (FH,">session/$sess"); $q -> save(FH); close FH; # do the bookkeeping here! opendir (DH,"./session"); @have = readdir(DH); foreach $sessfile (@have) { next if ($sessfile =~ /^\./); if (-M "./session/$sessfile" > 0.1) { unlink "./session/$sessfile"; } } } sub send_results { if ($setstring) { print "Set-cookie: ",$setstring,"\n"; } print $q -> header; print $html; } ##################################################################### sub do_work{ $html = ""; if ($action == 1) { initialgreeting(); return; } if ($action == 2) { getusersname(); return; } if ($action == 3) { additemtoorder(); return; } } ################################################################### sub initialgreeting { $html .= <<GREET; Hello, and welcome to this web page. Please enter your name here, and then you'll be allowed to add to your order on subsequent pages<P> GREET $html .= $q -> start_form; $html .= $q -> textfield(-name => "who"); $html .= $q -> end_form; $action = 2; } ################################################################### sub getusersname { $q -> param(-name => "items",-value => 0); $q -> param(-name => "who",-value => $fromform{"who"}); $link = "a"; makeitemform(); $action = 3; } ################################################################### sub additemtoorder { $itemno = $q ->param("items")+1; $q -> param(-name => "items",-value => $itemno); $q -> param(-name => "prod".$itemno, -value => $fromform{"product"}); $q -> param(-name => "quan".$itemno, -value => $fromform{"quantity"}); $link = "another"; makeitemform(); providereport(); } ################################################################### sub makeitemform { $w = $q -> param("who"); $html .= <<INITIAL; Thank you $w. You many now enter $link product and quantity to add to your order INITIAL $html .= $q -> start_form; $html .= "what: "; $html .= $q -> textfield(-name => "product"); $html .= "no: "; $html .= $q -> textfield(-name => "quantity"); $html .= $q -> submit; $html .= $q -> end_form; } sub providereport { for ($i=1; $i<=$itemno;$i++) { $thingtobuy = $q -> param("prod".$i); $amounttobuy = $q -> param("quan".$i); $html .= $q -> b($thingtobuy)." - ". $q -> i($amounttobuy). $q -> br ; } } Learn about this subject
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