我正在使用django和postgresql。我正在处理一个3向相关的下拉列表。添加国家/地区选择后,省地区将根据所选国家/地区自动更新。选择省份后,仅在刷新页面时才打开县域。如果您能在这方面帮助我,我会很高兴。
from django.db import models
class Country(models.Model):
name = models.CharField(max_length=30)
def __str__(self):
return self.name
class City(models.Model):
country = models.ForeignKey(Country, on_delete=models.CASCADE)
name = models.CharField(max_length=30)
def __str__(self):
return self.name
class District(models.Model):
city = models.ForeignKey(City, on_delete=models.CASCADE)
name = models.CharField(max_length=30)
def __str__(self):
return self.name
class Person(models.Model):
name = models.CharField(max_length=100)
birthdate = models.DateField(null=True, blank=True)
country = models.ForeignKey(Country, on_delete=models.SET_NULL, null=True)
city = models.ForeignKey(City, on_delete=models.SET_NULL, null=True)
district = models.ForeignKey(District, on_delete=models.SET_NULL, null=True)
def __str__(self):
return self.name
from django import forms
from .models import Person, Country, City, District
class PersonForm(forms.ModelForm):
class Meta:
model = Person
fields = ('name', 'birthdate', 'country', 'city', 'district')
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.fields['city'].queryset = City.objects.none()
if 'country' in self.data:
try:
country_id = int(self.data.get('country'))
self.fields['city'].queryset = City.objects.filter(country_id=country_id).order_by('name')
except (ValueError, TypeError):
pass # invalid input from the client; ignore and fallback to empty City queryset
elif self.instance.pk:
self.fields['city'].queryset = self.instance.country.city_set.order_by('name')
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.fields['district'].queryset = District.objects.none()
if 'city' in self.data:
try:
city_id = int(self.data.get('city'))
self.fields['district'].queryset = District.objects.filter(city_id=city_id).order_by('name')
except (ValueError, TypeError):
pass # invalid input from the client; ignore and fallback to empty District queryset
elif self.instance.pk:
self.fields['district'].queryset = self.instance.city.district_set.order_by('name')
def load_cities(request):
country_id = request.GET.get('country')
cities = City.objects.filter(country_id=country_id).order_by('name')
return render(request, 'neighbor/city_dropdown_list_options.html', {'cities': cities})
def load_districts(request):
city_id = request.GET.get('city')
districts = District.objects.filter(city_id=city_id).order_by('name')
return render(request, 'neighbor/district_dropdown_list_options.html', {'districts': districts})
<h2>Person Form</h2>
<form method="post" id="personForm" data-cities-url="{% url 'ajax_load_cities' %}" novalidate>
{% csrf_token %}
<table>
{{ form.as_table }}
</table>
<button type="submit">Save</button>
<a href="{% url 'person_changelist' %}">Nevermind</a>
</form>
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<script>
$("#id_country").change(function () {
var url = $("#personForm").attr("data-cities-url");
var countryId = $(this).val();
$.ajax({
url: url,
data: {
'country': countryId
},
success: function (data) {
$("#id_city").html(data);
}
});
});
$("#id_city").change(function () {
var url = $("#personForm").attr("data-districts-url");
var cityId = $(this).val();
$.ajax({
url: url,
data: {
'city': cityId
},
success: function (data) {
$("#id_district").html(data);
}
});
});
</script>
我在这里指的是示例。
显然不是关于3个链表的在线解决方案...我也被困在一个类似的项目中...