how to get jquery on() to work on not-yet-existing elements -

i have used delegate() bind events elements don't exist when dom loaded. understand on() supposed replace delegate, don't understand documentation on jquery site how translate following code use on()

$(document).delegate(             ".course_name, .start_date, .book_title, .book_author, .book_isbn",                 "click",                 function()                 {                     var whichbutton = $(this).attr("class");                     make_table(whichbutton);                     fillisbn();                 }); 

$(document).on("click",             ".course_name, .start_date, .book_title, .book_author, .book_isbn",                 function()                 {                     var whichbutton = $(this).attr("class");                     make_table(whichbutton);                     fillisbn();                 }); 

not hard, it?

internally nowdays .delegate reference .on. .delegate implemented as

function (selector, types, data, fn) {     return this.on(types, selector, data, fn); }