jQuery - Create hidden form element on the fly

javascript jquery forms hidden-field

$('<input>').attr('type','hidden').appendTo('form');

To answer your second question:

$('<input>').attr({    type: 'hidden',    id: 'foo',    name: 'bar'}).appendTo('form');

javascript jquery forms hidden-field

$('#myformelement').append('<input type="hidden" name="myfieldname" value="myvalue" />');

javascript jquery forms hidden-field

The same as David's, but without attr()

$('<input>', {    type: 'hidden',    id: 'foo',    name: 'foo',    value: 'bar'}).appendTo('form');

CodeHunter