Error trapping x@x.xxx in form

Hi all,

I have a javascript function I use for ensuring that the person filling in my form fills out each of the fields. This works well, but there is another feature I would like to add to it, but do not know what the syntax is, nor how I would be able to incorporate it into my current script without breaking it. I would like to ensure that not only does the person fill out all fields, including the email address field, but that if he/she was to fill out the email field with n/a or something that is not x@x.xxx (in other words a valid email string), it returns an alert alike to the ones I already use (in this case, telling the user to enter a real email address)

Any help is appreciated

This is my current script:

<!--
function checkform ( form )
{

// ** START **
if (form.name.value == "") {
alert( "Please enter your full name." );
form.name.focus();
return false ;
}
// ** END **
// ** START **
if (form.address.value == "") {
alert( "Please enter your full address." );
form.address.focus();
return false ;
}
// ** END **
// ** START **
if (form.postcode.value == "") {
alert( "Please enter your postcode." );
form.postcode.focus();
return false ;
}
// ** END **
// ** START **
if (form.phone.value == "") {
alert( "Please enter your phone number, including area code." );
form.phone.focus();
return false ;
}
// ** END **
// ** START **
if (form.emailaddr.value == "") {
alert( "Please enter your correct email address." );
form.emailaddr.focus();
return false ;
}
// ** END **
return true ;
}
//-->

Okay - I would go for a little bit of pattern matching (try the following for a taste):



if you look at the line:

RegExp("(\w+)(@)(\w+)(\.)((\w{3})||\w{2}\.\w{2})$");

what this does is matches a string and returns true or false if a good match is found - here we go:

(\w+) match any number of characters
(@) match an @ symbol
(\w+) then any characters again
(\.) then a fullstop
then (and I added a bit more)
((\w{3})||\w{2}\.\w{2}) match any 3 characters (e.g. com) OR any 2, a fullstop, then another 2 (e.g. co.uk)

The $ on the end means the pattern must match from the end of the string (i.e.) .com OR .co.uk at the end.

Hope this helps.

Thank you for your very full response, that makes perfect sense... I'll give it a bash.