live
is deprecated so use on()
delegated event.. delegate it to closest static parent.. ( this might not be the issue but its safe to use on() for future if incase you want to update your jquery in near future...)..here is the link if you want to read more about on()
$(document).on('click','#btnekleme', function () {.. //using closest static parent element is preferred here than the document
and you can send data as object in ajax
var inputValue= $.trim($("#txtalt_mus_adi").val());
data: {ad:inputValue},