you must to use Ajax to populate the second dropdown
Rafael E. Ferrero
2016-01-29 14:08 GMT-03:00 Andrea Pinna <andreapi...@gmail.com>:
> Dear all,
>
> I'm very unexperienced with Django but at the same time I'm trying hard to
> learn as much as possible.
>
> In my website I have a form with two dropdown menus, and I'd like to make
> the second (items) dependent by the first (categories).
>
> As an example, in the first dropdown the possible choices are FRUITS and
> VEGETABLES.
> When the user selects FRUITS, I'd like the second dropdown to show only
> ORANGE, APPLE, PEAR, etc.
> Else, when the user selects VEGETABLES, I'd like the second dropdown to
> show only LETTUCE, CABBAGE, CARROT, etc
>
> My current code follows (I kept it simple): the form shows two independent
> dropdown menus.
>
> Unfortunately I've not been able to adjust it as requested by
> django-smart-selects, e.g. by correctly modifying the Item model and the
> forms.py file.
>
> Could anyone help me, please?
>
> *********************************************
>
> The choices are stored in a MySQL database in two tables:
>
>
> *Types*ID Name
> 1 FRUIT
> 2 VEGETABLE
>
> *Items*
> ID Type_ID Name
> 1 1 Orange
> 2 1 Apple
> 3 1 Pear
> 4 2 Lettuce
> 5 2 Cabbage
> 6 2 Carrot
>
> Each item is therefore associated to a unique type (fruit or vegetable).
>
> *********************************************
>
> My *models.py* consists of:
>
> from django.db import models
> from smart_selects.db_fields import ChainedForeignKey
>
> class Type(models.Model):
> name = models.CharField(max_length=20)
>
> class Item(models.Model):
> name = models.CharField(max_length=20)
> type = models.ForeignKey(Type, on_delete=models.CASCADE)
>
>
> *********************************************
>
> My *forms.py* is:
>
> from django import forms
> from .models import Type, Item
>
> class SelectForm(forms.Form):
> q = Type.objects.all()
> qf = forms.ModelChoiceField(queryset = q, empty_label = None)
> s = Item.objects.all()
> sf = forms.ModelChoiceField(queryset = s, empty_label = None)
>
>
> *********************************************
>
> My *views.py* is:
>
> from django.shortcuts import render
> from .forms import SelectForm
>
> def index(request):
>
> form = SelectForm()
> context = {'f': form}
> return render(request, 'selects/test.html', context)
>
>
> *********************************************
>
> Finally, my template is:
>
> <html>
> <head>
> <title>Select data</title>
> </head>
> <body>
> <form action="/show_results/" method="get">
> {{f.as_p}}
> <input type="submit" value="Submit">
> </form>
> </body>
> </html>
>
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