Email form validation javascript

Keep in mind that client-side validation is just for the sake of user experience and in no way should be depended on. Everything should be revalidated on the server side as well.

A nice little script and I can think of several uses where it would be handy in full or in part, such as free forum/site software that don't allow for open source editing and/or PHP support.

But, with users being able to disable JS and/or manipulate it easier, it's definitely got it's risk. Nice little script though

sorry to say but this script checks very few things.. for example it will let thru the following bogus emails as valid ones:

a@b@c._
[email protected]
.xyz
*&^%$#@@@@(.)>>


and so on..

you'll also screw the users that input empty space before or after (happen often when copy-pasting) valid email and will be presented with error message..

i would google "javascript email validation" for good ready to use reliable regex example (there are many to choose from) - correct email validation in javacript (as well as in php) could not be implemented effectively without regex imo

Yeah, the script does have some drawbacks as you mention but it is a good starting point and weeds out most email address input errors. Of course it doesn't work for those who are determined to enter a wrong email address.

I agree that regex would be able to check input to a finer degree but understanding how regex works can be a little daunting for some.

Here's another little bit of code for ASP programmers that will convert text to proper case as there is no built-in function in VBScript to do this:

<%
''''''' FUNCTION TO CAPITALIZE THE FIRST CHARACTER OF EACH WORD IN THE INPUT STRING '''''''''
Function PCase(strInput)
iPosition = 1
Do While InStr(iPosition, strInput, " ", 1) <> 0
iSpace = InStr(iPosition, strInput, " ", 1)
strOutput = strOutput & UCase(Mid(strInput, iPosition, 1))
strOutput = strOutput & LCase(Mid(strInput, iPosition + 1, iSpace - iPosition))
iPosition = iSpace + 1
Loop
strOutput = strOutput & UCase(Mid(strInput, iPosition, 1))
StrOutput = strOutput & LCase(Mid(strInput, iPosition + 1))
PCase = strOutput
End Function
'''''''''''''''''''''''''''''''' END FUNCTION '''''''''''''''''''''''''''''''''''''''''''''''
%>

...so 'peter Smith' or 'PeTER smiTH' becomes 'Peter Smith'

<%
' example
Str = "PeTER smiTH"
Str = PCase(Str)
Response.write(Str)
%>


Hope this is useful to someone

basic user-side errors in emails can be handled more accurately in this way:


the function returns false if the string does not look like email address and true otherwise.
yet the strings like [email protected] still get thru so if you need more robust solution check http://www.regular-expressions.info/email.html for fast examples