How to remove previous append value JQuery

From my previous post to append dropdownlist value using jQuery .If you follow the step by step. The code actually work. But what will happen if the previous value are not remove and the first dropdown keep changed. The second dropdown value will keep increasing without remove the append  value.

Here is my solution to remove the previous append value to the dropdownlist.

<script type="text/javascript">
        $(document).ready(function () {
            
            var counter1 = 0;
            $("#dropdownCountry").change(function (e) {
                var obj1 = { Country: $("#dropdownCountry").val() };
                var isRemove1 = false;
                $.ajax({
                    type: "POST",
                    contentType: "application/json; charset=utf-8",
                    url: "http://localhost:3323/AjaxWebService.asmx/getState",
                    data: JSON.stringify(obj1),
                    dataType: "json",
                    success: function (data1) {
                        var appenddata1 = "";
                        var jsonData1 = JSON.parse(data1.d);
                        if (counter1 == 0)
                            counter1 = jsonData1.length;
                        else {
                            isRemove1 = true;
                        }
                        for (var i = 0; i < jsonData1.length; i++) {
                            appenddata1 += "<option id=\"appendDataTemp1\" value = '" + jsonData1[i].SHORT_NAME + " '>" + jsonData1[i].FULL_NAME + " </option>";
                        }
                        if (isRemove1) {
                            for (var j = 0; j < counter1; j++) {
                                $("#appendDataTemp1").remove();
                            }
                            counter1 = jsonData1.length; isRemove1 = false;
                        }
                        $("#dropdownState").append(appenddata1);
                    }
                });
            });
        });
    </script>

Note : please refer my previous post here to append dropdownlist value

By Mohd Zulkamal
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