javascript - Add new row onkeyup inside last input field -


imagine have 3 rows in table, there 3 input fields in every row. when type in last input field should add new row following last row when hit backspace , fields in latest row empty new added row should remove

i have no idea how prevent addition if new row appended table. i've done far.

$(document).ready(function(){     $("input[name=class_name\\[\\]]:last-child").keyup(function addnewrow(e){         var parent = $(this).closest('tr');         var tr = parent.clone();         if(e.keycode != 8){             $("#classes tr:last-child").remove();         }else{             $("#classes").append(tr);         }     }); });

how check selecting last element again, , compare this? if it's not same, row has been added


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