jQuery click event not firing on optgroup

Answer 1

$(document).ready(function() {
    $("select").change(function() {
        var clicked = $(this)
                         .find('option:selected') // get selected option
                         .parent()   // get that option's optgroup
                         .attr("label");   // get optgroup's label

        alert( clicked );
    });
});

DEMO

Note

.click() is wrong event you're using. see comment