We hope that you’ll find here something useful for you.
On this page I give the code you need for checking user input in a form.
This is called form validation — when you enter data the web application checks it to see if it is correct.
If so, it allows it to be submitted to the server and (usually) saved in a database; if not, it gives you error messages to explain what you've done wrong (provided you've done it right).
You may also enhance your already existing forms with adding some fancy effects that are presented in this tutorial. Info: If you’d like to modify your existing forms, skip the HTML and CSS sections of this tutorial and go ahead to step number five.