Validating user input with c
A few simple form attributes can have the same effect as reams of Java Script code libraries.Here we have an enhanced version of the above code where we've added HTML5 handler to the first password field which updates the pattern required by the second password field - in effect forcing them to be identical: Here you can see a screen shot from Safari of the form being completed.For security a password should never be displayed in HTML or sent by email.
In any case browsers such as Firefox and Opera will enforce the HTML5 validation rules and present messages as shown here: Presumably the browser messages will change according to the users language - something that would never be possible using only Java Script.The form below has three input fields: username, pwd1 and pwd2. If a false value is returned then the form submission is cancelled.This code will work for browsers as far back as Netscape 4 (circa 1997). If you're not sure how to place this on your page, you might need to read the preceding article on Form Validation, or view the HTML source of this page.They can be used not just in Java Script, but also PHP, Perl, Java and many other languages.Some text editors (not just vi) also allow them when searching for or replacing text. This is a new technique available in modern browsers and definitely the way of the future.
Because the input type obscures the text typed, you should let the user confirm that they haven't made a mistake.