(* $Id: counter.ml 552 2001-10-19 05:32:42Z pdoane $ *)
(***********************************************************************
* This example demonstrates a very simple CGI page that contains
* a counter that is incremented by the submit button.
*
* See add.ml for a slightly more complex example with more detailed
* information.
***********************************************************************)
open Netcgi
open Printf
let text = Netencoding.Html.encode_from_latin1
(* This function encodes "<", ">", "&", double quotes, and Latin 1
characters as character entities. E.g. text "<" = "<", and
text "ä" = "ä" *)
let main (cgi:cgi) =
cgi#set_header
~cache:`No_cache
~content_type:"text/html; charset=\"iso-8859-1\""
();
let n = int_of_string(cgi#argument_value ~default:"0" "Count") in
let out = cgi#out_channel#output_string in
out "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0//EN\" \
\"http://www.w3.org/TR/REC-html40/strict.dtd\">\n";
out "<html>\n";
out " <head>\n";
out " <title>counter</title>\n";
out " </head>\n";
out " <body>\n";
out " <h1>Counter</h1>\n";
out (sprintf " <form action=\"%s\" method=\"GET\" \
enctype=\"application/x-www-form-urlencoded\" />\n" (text(cgi#url())));
out (sprintf " <input type=\"submit\" name=\"Count\" value=\"%i\" />\n"
(n + 1));
out " </form>\n";
out " </body>\n";
out "</html>\n"
