$("#myid li").click(function() {
alert(this.id); // id of clicked li by directly accessing DOMElement property
alert($(this).attr('id')); // jQuery's .attr() method, same but more verbose
alert($(this).html()); // gets innerHTML of clicked li
alert($(this).text()); // gets text contents of clicked li
});
If you are talking about replacing the ID with something:
$("#myid li").click(function() {
this.id = 'newId';
// longer method using .attr()
$(this).attr('id', 'newId');
});
Demo here. And to be fair, you should have first tried reading the documentation: