advanced form validation

[FayeC]

I am trying to find some tutorials on advanced form validation.
I have a form and I have basic validation (empty, value, etc) but I
would like to validate some forms to stop people from using the form
to spam me or others.
I would like to restrict the value of the email field to just 1 email
value and to not allow urls to be input in the comments or other text
areas.
I have the following:

if (document.form.fullname.value== "http://" )
{
alert("This form will not serve as email relay for spamming
purposes. Enter a real name!");
document.form.fullname.select();
document.form.fullname.focus();
return false;
}

But that only checks if the value *is* http://.....I wanted to
validate for values that *contain* http://.....
As for the email field I validate for values that *don't have* @ or .
but I don't know how to validate to stop the input of more than 1 @...

Can anybody give me a hand on this one?

Thank you in advance,

FayeC

[Ian Collins]

FayeC wrote:

I am trying to find some tutorials on advanced form validation.
I have a form and I have basic validation (empty, value, etc) but I
would like to validate some forms to stop people from using the form
to spam me or others.

You should do this on the server side, consider the user who disables
JavaScript, or access your site through scripts.
--
Ian Collins.