hidden variable?

[ankur rathi]

Dear all,

What is hidden variable and how to add and send them with request? Why we use them?

Thanks.

[William Brogden]

I am guessing that you mean a hidden field in an HTML form.
As far as servlet request objects are concerned, the value in a hidden field is treated just like other form values.
You can write a value into a field when the html page is created or have Javascript put a value there.
Use hidden fields for any text value that you want to have submitted with the request but that you don't want the user to see or modify.
Bill

[ankur rathi]

Originally posted by William Brogden:
I am guessing that you mean a hidden field in an HTML form.
As far as servlet request objects are concerned, the value in a hidden field is treated just like other form values.
You can write a value into a field when the html page is created or have Javascript put a value there.
Use hidden fields for any text value that you want to have submitted with the request but that you don't want the user to see or modify.
Bill

Thanks William. I got it completely.

But, how to write them in HTML page or through Javascript? Please, could some body give me code...

Thanks.

[Bear Bibeault]

The HTML 4 Specification.

Also an excellent HTML 4 reference.
[ December 11, 2005: Message edited by: Bear Bibeault ]

[Gaurav Chhabras]

example is -:

<input type="hidden" name="user_name" value="">

then this field will go to next page as you submit the page but not being able to view bu the user