jQuery get value of select onChange

Question

I was under the impression that I could get the value of a select input by doing this $(this).val(); and applying the onchange parameter to the sel

Answer 1

I want to add, who needs full custom header functionality

   function addSearchControls(json) {
        $("#tblCalls thead").append($("#tblCalls thead tr:first").clone());
        $("#tblCalls thead tr:eq(1) th").each(function (index) {
            // For text inputs
            if (index != 1 && index != 2) {
                $(this).replaceWith('');
                var searchControl = $("#tblCalls thead tr:eq(1) th:eq(" + index + ") input");
                searchControl.on("keyup", function () {
                    table.column(index).search(searchControl.val()).draw();
                })
            }
            // For DatePicker inputs
            else if (index == 1) {
                $(this).replaceWith('');

                $('.tblCalls-search-date').on('keyup click change', function () {
                    var i = $(this).attr('id');  // getting column index
                    var v = $(this).val();  // getting search input value
                    table.columns(index).search(v).draw();
                });

                $(".datepicker").datepicker({
                    dateFormat: "dd-mm-yy",
                    altFieldTimeOnly: false,
                    altFormat: "yy-mm-dd",
                    altTimeFormat: "h:m",
                    altField: "#tarih-db",
                    monthNames: ["Ocak", "Şubat", "Mart", "Nisan", "Mayıs", "Haziran", "Temmuz", "Ağustos", "Eylül", "Ekim", "Kasım", "Aralık"],
                    dayNamesMin: ["Pa", "Pt", "Sl", "Ça", "Pe", "Cu", "Ct"],
                    firstDay: 1,
                    dateFormat: "yy-mm-dd",
                    showOn: "button",
                    showAnim: 'slideDown',
                    showButtonPanel: true,
                    autoSize: true,
                    buttonImage: "http://jqueryui.com/resources/demos/datepicker/images/calendar.gif",
                    buttonImageOnly: false,
                    buttonText: "Tarih Seçiniz",
                    closeText: "Temizle"
                });
                $(document).on("click", ".ui-datepicker-close", function () {
                    $('.datepicker').val("");
                    table.columns(5).search("").draw();
                });
            }
            // For DropDown inputs
            else if (index == 2) {
                $(this).replaceWith('Seç=>=<=!=');

                var selectedOperator;
                $('#filter_comparator').on('change', function () {
                    var i = $(this).attr('id');  // getting column index
                    var v = $(this).val();  // getting search input value
                    selectedOperator = v;
                    if(v=="select")
                        table.columns(index).search('select|0').draw();
                    $('#filter_value').val("");
                });

                $('#filter_value').on('keyup click change', function () {
                    var keycode = (event.keyCode ? event.keyCode : event.which);
                    if (keycode == '13') {
                        var i = $(this).attr('id');  // getting column index
                        var v = $(this).val();  // getting search input value
                        table.columns(index).search(selectedOperator + '|' + v).draw();
                    }
                });
            }
        })

    }