var id =  $("td:nth-child(1)", this).text(); //get the ID from the 1st TD of the current row
var qty = $("select[name='ratelist']", this).val(); // get the qty from the value of the <select>
var price = $("select[name='ratelist'] :selected", this).data("cost"); // get the price from the data-cost attribute of the <select>
// add the id, qty and price to the data array
data[data.length] = {id: id, qty: qty, price: price};

Select all