Setting form element from jquery dialog

There is a Jsp form, in which I have an input field, called height. There is a modal dialog, which was being created by jquery.

I need to set the value of height from the dialog, using jquery. When I submit the form in jsp page, I want that height value in action class.

I am getting height as 0 in action class.(I have created getter and setter methods also).

Help would be appreciated.