[大数据]动态二级下拉框联动（二级数据从数据库中获取）

靠天靠地不如靠自己

要实现的效果：

? ? ? ?上面的一级下拉框选择改变的话，下面的二级下拉框的内容也会改变（省市级联）

?

?前端代码
?

<tr>
            <td width="10%" class="tableleft">所挂科室</td>
            <td>
                <select name="d_keshi" id="keshi" value="">

                </select>
            </td>
        </tr>
        <tr>
            <td width="10%" class="tableleft">指定医生</td>
            <td>
                <select name="d_name" id="doctor" value="">

                </select>
            </td>
        </tr>

?调用函数

function queryKeshi() {
            $.ajax({
                type: "GET",
                url: "/hosregister/keshi",
                data: "",
                success: function (vo) {
                    var keshi = vo.list;
                    var html = "<option value=\"\">请选择科室</option>"
                    for (var i = 0; i < keshi.length; i++) {
                        var options = "<option value='" + keshi[i].d_keshi + "'>" + keshi[i].d_keshi + "</option>";
                        if (html.indexOf(options) == -1) {
                            html += options;
                        }
                        $("select[name='keshi']").html(html);
                    }
                }
            })
            $("#keshi").change(function () {
                alert($("#keshi").val());
                $.ajax({
                    type: "GET",
                    url: "/doctor/ha/" + $("#keshi").val(),
                    data: "",
                    success: function (vo) {
                        var doctor = vo.list;
                        var html = "<option value=\"\">请选择医生</option>"
                        for (var i = 0; i < doctor.length; i++) {
                            var options = "<option value='" + doctor[i].d_name + "'>" + doctor[i].d_name + "</option>";
                            html += options;
                            $("select[name='doctor']").html(html);
                        }
                    }
                })
            })
        }

url: "/hosregister/keshi" 为查询所有科室

url: "/doctor/ha/" + $("#keshi").val() 为通过科室查询医生

小白自学，简单写法，欢迎批评！