Java实现多级联动表单的动态加载与更新

public class City {
    private String value; // 城市值
    private String name; // 城市名称

    // getter和setter方法省略
}

<select id="province">...</select> <!-- 省份下拉框 -->
<select id="city">...</select> <!-- 城市下拉框 -->
<select id="district">...</select> <!-- 区县下拉框 -->

<script>
$(document).ready(function() {
    // 监听省份选择事件
    $('#province').change(function() {
        var selectedProvince = $(this).val();

        // 发送Ajax请求，获取对应省份的城市数据
        $.ajax({
            type: 'POST',
            url: '/get-cities',
            data: { province: selectedProvince },
            success: function(data) {
                // 清空城市下拉框选项
                $('#city').empty();

                // 更新城市下拉框选项
                for (var i = 0; i < data.length; i++) {
                    var city = data[i];
                    $('#city').append($('<option></option>').val(city.value).text(city.name));
                }

                // 触发城市选择事件
                $('#city').trigger('change');
            },
            error: function() {
                alert('Failed to load cities!');
            }
        });
    });

    // 监听城市选择事件
    $('#city').change(function() {
        var selectedCity = $(this).val();

        // 发送Ajax请求，获取对应城市的区县数据
        $.ajax({
            type: 'POST',
            url: '/get-districts',
            data: { city: selectedCity },
            success: function(data) {
                // 清空区县下拉框选项
                $('#district').empty();

                // 更新区县下拉框选项
                for (var i = 0; i < data.length; i++) {
                    var district = data[i];
                    $('#district').append($('<option></option>').val(district.value).text(district.name));
                }
            },
            error: function() {
                alert('Failed to load districts!');
            }
        });
    });

    // 初始化省份选择事件
    $('#province').trigger('change');
});
</script>

@RequestMapping(value = "/get-cities", method = RequestMethod.POST)
@ResponseBody
public List<City> getCities(@RequestParam("province") String province) {
    // 根据省份查询城市列表
    List<City> cities = cityService.getCitiesByProvince(province);
    return cities;
}

@RequestMapping(value = "/get-districts", method = RequestMethod.POST)
@ResponseBody
public List<District> getDistricts(@RequestParam("city") String city) {
    // 根据城市查询区县列表
    List<District> districts = districtService.getDistrictsByCity(city);
    return districts;
}