How use each for elements that was created by java script on page?

Get some elements:

elements = $(".class_or_any_other_descriptor"); // but not id descriptor

or get some parent element, then its children:

parent = $("#some_descriptor"); // preferably id descriptors as it guarantees uniqueness
elements = parent.children();

Now you can iterate them:

$.each(children, function(index, value) {
    // do something with value:
    value.addClass("foo");
});

or

children.each(function() {
    $(this).addClass("foo"); // this will be a single element
});

Please see:
http://api.jquery.com/children/[^],
http://api.jquery.com/jQuery.each/[^],
http://api.jquery.com/each/[^],
http://api.jquery.com/category/selectors/[^],
http://api.jquery.com/id-selector/[^].

—SA