Django 管理员.显示分层下拉过滤器

问题描述

我有以下型号:

from django.db import models

class State(models.Model):
    name = models.CharField(max_length=30)
    abbreviation = models.CharField(max_length=2)

    def numberOfCities(self):
        return self.city_set.count()

    def __unicode__(self):
        return u"{0} - {1}".format(self.abbreviation, self.name)

class City(models.Model):
    name = models.CharField(max_length=40)
    state = models.ForeignKey(State)

    class Meta:
        verbose_name_plural = 'Cities'

    def __unicode__(self):
        return self.name

class Company(models.Model):
    name = models.CharField(max_length=60)
    description = models.CharField(max_length=1000)
    city = models.ForeignKey(City)

    class Meta:
        verbose_name_plural = 'Companies'

    def __unicode__(self):
        return self.name;

正如您所见，每家公司都与一个城市相关联，并且正如您所期望的那样，Django 管理员会生成包含城市下拉列表的公司创建表单.但为了改善用户体验，我希望用户首先选择州，然后城市下拉菜单将填充该州的城市.有这样做的标准方法吗?

(function($) {
// Note that this function works only for one widget per page
$('#state').change(function(){
    $('#city').load('/cities_by_state/', {id: this.value}); // the endpoint returns HTML
});
})(JQuery||django.JQuery);