Django：可维护的下拉选项

Question

I have a newbie problem(sorry for the bad english).

I am trying to make a maintainable drop down choices on the address part of my project.

Let's say that I have these models:

class STATES(models.Model):
    state= models.CharField(max_length=255)

class CITIES(models.Model):
    fkey = models.ForeignKey(STATES)
    CITY = models.CharField(max_length=255)

    def __unicode__(self):
        return self.CITY

And forms

class address(ModelForm):
    state = forms.ModelChoiceField(queryset = STATES.objects.all())
    CITY = forms.ModelChoiceField(queryset = CITIES.objects.all())
class Meta:
    model = REGIONS
    fields = ('state', 'CITY',)

How do i make the form display the cities that is in the state that I selected?

Any pointers, advice, links, or even a sample code would be much appreciated.

Thanks in advance

Answer 1

If you want to create your own, you need ajax to help you. You need to capture the dropdown change of your state , then using ajax to load the city and display it in the template. There's no shortcut in django to do that. Otherwise take the third party package like https://github.com/digi604/django-smart-selects , it would simplify this process.