Reference
http://www.nullskull.com/a/1692/jquery-ui-autocomplete-with-ashx-webhandler-data-source.aspx
https://dotblogs.com.tw/shunnien/2014/01/10/139529
http://yhhuang1966.blogspot.tw/2013/04/jquery-ui-autocomplete.html
http://stackoverflow.com/questions/14552600/jquery-ui-autocomplete-with-ashx