This plugin greatly expands the ability to retrieve and set values in forms beyond
jQuery's standard val() method (and Mike Alsup's Form Plug-in's
fieldArray() method) by allowing you to interact with all types of
form field elements (except input[type="file"], which is a
read-only element.) It works the same way for text elements as it does for
radio, checkbox and select elements.
The plug-in was built on the concept that you want to manipulate the fields
like their traditional variables. Selectors should be written to query a specific
field object (i.e. elements that would be linked together via a common name
attribute, for example $("input[name='myRadioButton']").)
Elements that return multiple values are either separated by a comma or returned as an array based on which methods you invoke.
For elements that allow more than one option to be select (select and checkbox elements) you can specify a comma delimited list or an array of values to mark multiple options as being selected.