你可能需要使用以下技术：
- 自定义Django表单字段（在模型表单中）
- ajax（获取记录）
- simplejson（向ajax发送json响应）
- jQuery（更新客户端上的组合框）
让我们看一个示例（只是从我的脑海中未真正测试过）：
型号
from django.db import modelsclass Campus(models.Model): name = models.CharField(max_length=100, choices=choices.CAMPUSES) def __unipre__(self): return u'%s' % self.nameclass School(models.Model): name = models.CharField(max_length=100) campus = models.ForeignKey(Campus) def __unipre__(self): return u'%s' % self.nameclass Centre(models.Model): name = models.CharField(max_length=100) school = models.ForeignKey(School) def __unipre__(self): return u'%s' % self.name
Forms.py
import modelsfrom django import formsclass CenterForm(forms.ModelForm): campus = forms.ModelChoiceField(queryset=models.Campus.objects.all()) school = forms.ModelChoiceField(queryset=models.School.objects.none()) # Need to populate this using jquery centre = forms.ModelChoiceField(queryset=models.Centre.objects.none()) # Need to populate this using jquery class meta: model = models.Center fields = ('campus', 'school', 'centre')现在，在你的视图中编写一个方法，该方法为校园下的学校和学校下的中心返回json对象：
Views.py
import modelsimport simplejsonfrom django.http import HttpResponsedef get_schools(request, campus_id): campus = models.Campus.objects.get(pk=campus_id) schools = models.School.objects.filter(campus=campus) school_dict = {} for school in schools: school_dict[school.id] = school.name return HttpResponse(simplejson.dumps(school_dict), mimetype="application/json")def get_centres(request, school_id): school = models.School.objects.get(pk=school_id) centres = models.Centre.objects.filter(school=school) centre_dict = {} for centre in centres: centre_dict[centre.id] = centre.name return HttpResponse(simplejson.dumps(centre_dict), mimetype="application/json")现在编写一个ajax / jquery方法来获取数据并填充selectHTML中的元素。
AJAX / jQuery$(document).ready(function(){ $('select[name=campus]').change(function(){ campus_id = $(this).val(); request_url = '/get_schools/' + campus_id + '/'; $.ajax({ url: request_url, success: function(data){ $.each(data, function(index, text){ $('select[name=school]').append( $('<option></option>').val(index).html(text) ); }); } }); return false; })});
