[SabreWolf3]

Hi all,

I use a popular script for client-side validation of a form. The following snippet checks to make sure my email field, named "email" (a) is not blank, (b) contains at least one "@" sign and (c) contains at least one "."

I also need it to verify that there is not more than one "@" sign as well, because I have received a lot of form submissions lately with people typing two addresses, like abcd@home.com OR abcd@work.com. This screws up my asp mailer because the asp checks for more than one "@" sign, and if it finds more than one, it just doesn't send a copy to whoever submitted the form. I need to change this behavior and have the page throw an error if they try to enter more than one email address.

Can anyone help? Thanks !!!!

//Check for an e-mail address and that it is valid

if ((document.comments.email.value == "") ||

(document.comments.email.value.length > 0 

&& (document.comments.email.value.indexOf("@",0) == - 1 ||

document.comments.email.value.indexOf(".",0) == - 1))) { 

errorMsg += "\n\tE-mail Address \t- Enter your valid e-mail address please";
}

[Rockn]

Here's an ASP server side script from 4Guys:

http://www.4guysfromrolla.com/webtech/051999-1.shtml

[SabreWolf3]

Hey Rockn,

That looks like a cool script, but there's only one problem. The form I'm validating is 6 pages long, and I need to do it client-side so that there's no chance my visitors can lose the information they've typed in the fields.

I really need to find out how to count the instances of the "@" symbol in the email field.

Thanks,
Richard

[Rockn]

They won't loose any of their information if you place the code in the same page and it doesn't get refreshed. Put validation on each entry point on the form before it will process the next section. To find the number of @ symbols you will need to do a count of the instances in the string and if they are greater than 1 send them an error message. You might want to do pop up warnings, that way it wil definately not refresh the form and loose the information on it.

[SabreWolf3]

Hi Rockn, after toiling away, I finally managed to figure it out. For anyone interested, here's the code I ended up using...

[script language="JavaScript"][!--
function countInstances(string,word) {
var count = 0;
var substrings = string.split(word);
return substrings.length - 1;
}
//--][/script]

//Check for more than one "@" sign in the email field
var count = countInstances(document.comments.email.value,"@");
if (count >1){
errorMsg += "\n\tE-mail Address \t- There can only be one @ sign in an e-mail address"
errorMsg +="\n \t\t\t (please enter one e-mail address only)";
}