Validating an Email address Form Field

Validating an Email address Form Field (Full Version)

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Peppergal -> Validating an Email address Form Field (3/21/2008 11:59:37)
I've had issues with people not knowing to put an email address in the form field - even though it clearly says "Email Address." If someone fills in the form without their email address, or if they don't put the @whatever.com (believe it or not, some people have just put their username without the rest of the address) there is no way for me to contact them. This form is voluntary, if they want to be contacted by us....it's not required, so it's important that they tell us how to contact them. I tried validating the email address form field so that the form will only go through if the user puts in an actual email address. If i put the @ sign under "other" , then if there is a dash, underscore, or period in the email address, the form won't go through, as it says only the @ , letters, and digits are allowed....a period or underscore or dash will make it not allowed. If I put @ . - _ in the "other" field, it seems to let ANYTHING go through, even if there are none of those characters. I'm at a loss on how to validate this so that only something with a proper email address format goes through. The form I'm trying to validate is this one: http://www.paupackgroup.com/sell.htm I even had one email address come through as "Hawley, PA" It is surprising but true. LOL

coreybryant -> RE: Validating an Email address Form Field (3/21/2008 15:35:12)

I think this might be the script - so many of them but it might make sure there is a proper email format

<script language="JAVASCRIPT">
<!--
function isEMail( strValue) {
  var objRegExp  = /^[a-z]\w*([.\-]\w+)*@[a-z]\w*([.\-]\w+)*\.[a-z]{2,3}$/i;
  return objRegExp.test(strValue);
}
function validate(theForm){
    if(theForm.EMail.value == ""){
         alert('Please enter a valid E-mail address to submit the form');
         theForm.EMail.focus();
         return false;
    }
            if(!hasValue(theForm.Name.value)){
        alert("Please enter your Name.");
               theForm.Name.focus();
             return false;
}
    if(!isEMail(theForm.EMail.value)){
         alert('Please enter a valid E-mail address to submit the form');
         theForm.EMail.select();
         theForm.EMail.focus();
         return false;
         }
    return true;
}
// -->
</script>

rdouglass -> RE: Validating an Email address Form Field (3/22/2008 1:06:12)
An alternative that I use often is ASP once the form is posted. Preference is usually to validate at the client but sometimes you need to validate at the server as well. I use an ASP function like this: <%Function RegExpTest(sEmail) RegExpTest = false Dim regEx, retVal Set regEx = New RegExp ' Create regular expression for emails regEx.Pattern ="^[\w-\.]{1,}\@([\da-zA-Z-]{1,}\.){1,}[\da-zA-Z-]{2,3}$" regEx.IgnoreCase = true retVal = regEx.Test(sEmail) If not retVal Then exit function End If RegExpTest = true End Function%> and use it like so: <%If RegExpTest(Request.form("EmailFormField")) Then 'Do something when valid email Else 'Do something else End If%> Just an alternative. Personally I tend to validate at the server as well since we can't always rely on the JS and it doesn'ty slow things down much at all.

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