<!DOCTYPE html> <head> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script> <script src="jquery.js"></script> </head> <html lang="en"> <body> <div> <p><input type="text" class="js-characters-change"></p> </div> </body> </html> $(function(){ $(".js-characters-change").blur(function(){ charactersChange($(this)); }); charactersChange = function(ele){ var val = ele.v