Cookie - Chapter 12-1


<html xmlns = "http://www.w3.org/1999/xhtml">
   <head>
      <title>Using Cookies</title>

      <script type = "text/javascript">
         <!--
         var now = new Date(); // current date and time
         var hour = now.getHours(); // current hour (0-23)
         var name;

         if ( hour < 12 ) // determine whether it is morning
            document.write( "<h1>Good Morning, " );
         else
         {
            hour = hour - 12; // convert from 24 hour clock to PM time

            // determine whether it is afternoon or evening
            if ( hour < 6 )
               document.write( "<h1>Good Afternoon, " );
            else
               document.write( "<h1>Good Evening, " );
         }

         // determine whether there is a cookie
         if ( document.cookie )
         {
            // convert escape characters in the cookie string to their
               // english notation
            var myCookie = unescape( document.cookie );

               // split the cookie into tokens using = as delimiter
            var cookieTokens = myCookie.split( "=" );

            // set name to the part of the cookie that follows the = sign
            name = cookieTokens[ 1 ];
         }
         else
         {
            // if there was no cookie then ask the user to input a name
            name = window.prompt( "Please enter your name", "GalAnt" );

               // escape non-alphanumeric characters in the name string
               // and add name to the cookie
            document.cookie = "name=" + escape( name );
         }

         document.writeln(
            name + ", welcome to JavaScript programming! </h1>" );
         document.writeln( "<a href= \" JavaScript:wrongPerson() \" > " +
            "Click here if you are not " + name + "</a>" );

         // reset the document's cookie if wrong person
         function wrongPerson()
         {
            // reset the cookie
            document.cookie= "name=null;" +
               " expires=Thu, 01-Jan-95 00:00:01 GMT";

            // after removing the cookie reload the page to get a new name
            location.reload();
         }

         // -->
      </script>
   </head>

   <body>
      <p>Click Refresh (or Reload) to run the script again</p>
   </body>
</html>