PublicPosts/Prevent JQuery Firing Twice.js

$(".toggle_action_items").unbind().on('click', 'a', function (e) {
    e.preventDefault();
    var proj_num = ($(this).attr('id')).split("-")[1].split("_")[1];
    var id = "#action_items_list-projnum_" + proj_num;
    $(id).slideToggle(100, function () { });
});