Another very useful input widget is the
HIDDEN field that is used to pass administrative data to the
server. The data and the value are hidden from the user so that
they can't easily modify it. In fact, the HIDDEN input widget is
totally invisible to the user.
For the most part, the HIDDEN tag is used
so that you can pass administrative data. As such, it takes a NAME
and a VALUE attribute.
For example, consider the following hidden
<INPUT TYPE = "HIDDEN" NAME = "admin"
VALUE = "selena">
<INPUT TYPE = "HIDDEN" NAME = "form_version"
VALUE = "2.1">
In this case, the browser would simply tag
on the following name/value pair in the HTTP message body:
Since the user is not concerned with this
administrative data, it is hidden from them. However, you can
pass as much data as you want using this input method
Regardless, we will talk a lot more about
hidden fields tomorrow when we discuss "state maintenance" in more