$(document).on('click') not working on IPAD...

$(document).on('click') not working on IPAD...

Hi,
sorry for my bad english.....i m a poor french guy...
like i said in my subject, i've a web site in which i use : 
$(document).on('click','td.myClass',function(){
      doSomething();
});

since few weeks, ipad users cannot use the function, every click event bind like this doesn t work for them....
i m looking for answers and i try this : 

$(document).on('click touchstart','td.myClass',function(){
      doSomething();
});
but it still not work.....

ps : i m using jquery 1.11
ps 2 : this problem appears on not anchor element...

Thak you !