Bootstrap realizes three-level linkage between provinces and cities (-pro-test available!)

Bootstrap three-level linkage is very common and necessary

html page

<!--  省市区三级联动 begin -->
        <div class="form-group">
            <label class="col-sm-2 control-label"><i>*</i>所在地址</label>
            <div class="col-sm-3">
                <select name="input_province" id="input_province" class="form-control" >
                    <option value="">--请选择--</option>
                </select>
            </div>
            <div class="col-sm-3">
                <select name="input_city" id="input_city" class="form-control">
                    <option value=""></option>
                </select>
            </div>
            <div class="col-sm-3">
                <select name="input_area" id="input_area" class="form-control">
                    <option value=""></option>
                </select>
            </div>
        </div>

        <!-- 省市区三级联动  end-->

js part

<!-- 三级联动 begin -->
    <script type="text/javascript" src="/js/plugins/address/address.js"></script>
    <script >
        $(function () {
            var html = "";
            $("#input_city").append(html);
            $("#input_area").append(html);
            $.each(pdata,function(idx,item){
                if (parseInt(item.level) == 0) {
                    html += "<option value="+item.code+" >"+ item.names +"</option> ";
                }
            });
            $("#input_province").append(html);

            $("#input_province").change(function(){
                if ($(this).val() == "") return;
                $("#input_city option").remove();
                $("#input_area option").remove();
                //var code = $(this).find("option:selected").attr("exid");
                var code = $(this).find("option:selected").val();
                code = code.substring(0,2);
                var html = "<option value=''>--请选择--</option>";
                $("#input_area option").append(html);
                $.each(pdata,function(idx,item){
                    if (parseInt(item.level) == 1 && code == item.code.substring(0,2)) {
                        html +="<option value="+item.code+" >"+ item.names +"</option> ";
                    }
                });
                $("#input_city ").append(html);
            });

            $("#input_city").change(function(){
                if ($(this).val() == "") return;
                $("#input_area option").remove();
                var code = $(this).find("option:selected").val();
                code = code.substring(0,4);
                var html = "<option value=''>--请选择--</option>";
                $.each(pdata,function(idx,item){
                    if (parseInt(item.level) == 2 && code == item.code.substring(0,4)) {
                        html +="<option value="+item.code+" >"+ item.names +"</option> ";
                    }
                });
                $("#input_area ").append(html);
            });
        });
    </script>
    <!-- 三级联动 end -->

I uploaded the js file, click here:)
https://download.csdn.net/download/shunzi1046/10362881