Form not validating
One popular approach is to install Fail2Ban to monitor log files and lock out repeat offendors.
The rest of the HTML and Java Script remains unaltered: polyfill code which can be found further down the page.The best thing about HTML5 attributes is that they have no effect whatsoever on unsupported browsers, so older versions of Internet Explorer will act as if they are not present and just run the Java Script validation as before.At this stage both Firefox and Opera enforce HTML5 validation attributes in the browser while Safari only lets you use them with Java Script or for CSS effects.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.Consider the following: If you are using a supported browser you can use the form below to test the regular expression: If you want to restrict the password to ONLY letters and numbers (no spaces or other characters) then only a slight change is required.
Instead of using is shorthand for 'any letter, number or the underscore character'.
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.
Remember that, as Java Script isn't available in all browsers, you should also use server-side scripting to validate all data before recording it in a database or elsewhere.
You might also want to spice up your forms using HTML5 Form Validation as we've done further down the page.
Because the input type obscures the text typed, you should let the user confirm that they haven't made a mistake.