8

8. Validate new registration

Create the following function to add the user's first name to the cookie:

function addcookie(name,value)

{

var expiredate = new Date();

var expires = "";

expiredate.setTime(expiredate.getTime() + (1000*60*60*24*365));

expires = "expires=" + expiredate.toGMTString();

document.cookie = name + "=" + escape(value) + ";" + expires + ";";

}

Insert the following code in the chkentry() function:

function chkentry()

…

else

{

addcookie("FirstName", document.Registration.FirstName.value);

alert("Thank you!");

…

Create the following function to retrieve the cookie in welcome.html:

function getcookie(name)

{

var mycookie = document.cookie + ";";

var value = null;

var findName = name + "=";

var end;

if (mycookie.length > 0)

{

var begin = mycookie.indexOf(findName);

if (begin != -1)

{

begin = begin + findName.length;

end = mycookie.indexOf(";", begin);

if (end == -1)

end = mycookie.length;

value = unescape(mycookie.substring(begin, end));

}

return value;

}

Create the following function to check whether registration is needed and place it in welcome.html:

function chkcookie()

{

var name = "";

name = getcookie("FirstName");

if (name != null)

alert("Welcome " + name);

else

location="form.html";

}

Insert the onLoad property in the <BODY> tag of welcome.html