serialize from a table element and not the whole form

you cannot serialize a table -- that method doesn't apply to that kind of DOM object, only forms and form fields can be serialized.

if you really want to do what you're proposing, you need the proper selector to pick just the children of tbl2 that are also form elements, and then you'll have to serialize each one of those by hand. someone did it in another question, here: serialize without a form?

a better way might be to disable all the form elements that are NOT in the table you're interested in -- you'll need a selector to pick all form elements that are not child elements of tbl2 -- and THEN serialize the form. the disabled elements will be omitted.

First and foremost, a <table> cannot have a name attribute, and even if it could, the jQuery ID selector (#) would not match it.

If you use id instead (<table id="tbl2">), it will work like this:

var params = $("#tbl2 :input").serialize();

The :input selector selects all the form elements (here, inside #tbl2), it is needed because serialize() will only work on those.

Please also check out my jsFiddle Demo.

you can use the serializeArray method, which will give you the array of input fields and can be used with the data.

var params = $("#tbl2 input").serializeArray();