Django: ¿Cómo puedo crear un formulario de selección múltiple?

No olvides que en las ciencias un problema casi siempre tiene diversas resoluciones, pero nosotros compartiremos lo más óptimo y mejor.

Solución:

creo CheckboxSelectMultiple debería funcionar de acuerdo a su problema.

En tus forms.pyescribe el siguiente código:

from django import forms


class CountryForm(forms.Form):
    OPTIONS = (
        ("AUT", "Austria"),
        ("DEU", "Germany"),
        ("NLD", "Neitherlands"),
    )
    Countries = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple,
                                          choices=OPTIONS)

En tus views.pydefine la siguiente función:

def countries_view(request):
    if request.method == 'POST':
        form = CountryForm(request.POST)
        if form.is_valid():
            countries = form.cleaned_data.get('countries')
            # do something with your results
    else:
        form = CountryForm

    return render_to_response('render_country.html', 'form': form,
                              context_instance=RequestContext(request))

En tus render_country.html:

    % csrf_token %
     form.as_p 
    

Lo hice de esta manera:

formularios.py

class ChoiceForm(ModelForm):
    class Meta:
        model = YourModel

    def __init__(self, *args, **kwargs):
        super(ChoiceForm, self).__init__(*args, **kwargs)
        self.fields['countries'] =  ModelChoiceField(queryset=YourModel.objects.all()),
                                             empty_label="Choose a countries",)

urls.py

from django.conf.urls.defaults import * 
from django.views.generic import CreateView
from django.core.urlresolvers import reverse

urlpatterns = patterns('',
    url(r'^$',CreateView.as_view(model=YourModel, get_success_url=lambda: reverse('model_countries'),
        template_name='your_countries.html'), form_class=ChoiceForm, name='model_countries'),)

sus_países.html

    % csrf_token %
     form.as_table 
    
 

Funciona bien en mi ejemplo. Si necesita algo más, ¡pregúnteme!

Con respecto a mi segunda pregunta, esta es la solución. Una clase de extensión:

from django import forms
from django.utils.encoding import force_unicode
from itertools import chain
from django.utils.html import escape, conditional_escape

class Select(forms.Select):
    """
    A subclass of Select that adds the possibility to define additional 
    properties on options.

    It works as Select, except that the ``choices`` parameter takes a list of
    3 elements tuples containing ``(value, label, attrs)``, where ``attrs``
    is a dict containing the additional attributes of the option.
    """
    def render_options(self, choices, selected_choices):
        def render_option(option_value, option_label, attrs):
            option_value = force_unicode(option_value)
            selected_html = (option_value in selected_choices) and u' selected="selected"' or ''
            attrs_html = []
            for k, v in attrs.items():
                attrs_html.append('%s="%s"' % (k, escape(v)))
            if attrs_html:
                attrs_html = " " + " ".join(attrs_html)
            else:
                attrs_html = ""
            return u'3'.format(
                escape(option_value), selected_html, attrs_html, 
                conditional_escape(force_unicode(option_label))
                )
            '''
            return u'%s' % (
                escape(option_value), selected_html, attrs_html,
                conditional_escape(force_unicode(option_label)))
            '''
        # Normalize to strings.
        selected_choices = set([force_unicode(v) for v in selected_choices])
        output = []
        for option_value, option_label, option_attrs in chain(self.choices, choices):
            if isinstance(option_label, (list, tuple)):
                output.append(u'' % escape(force_unicode(option_value)))
                for option in option_label:
                    output.append(render_option(*option))
                output.append(u'')
            else:
                output.append(render_option(option_value, option_label,
                    option_attrs))
        return u'n'.join(output)

class SelectMultiple(forms.SelectMultiple, Select):
    pass

Ejemplo:

OPTIONS = [
        ["AUT", "Australia", 'selected':'selected', 'data-index':'1'],
        ["DEU", "Germany", 'selected':'selected'],
        ["NLD", "Neitherlands", 'selected':'selected'],
        ["USA", "United States", ]
    ]

Sección de Reseñas y Valoraciones

Si conservas algún reparo o disposición de renovar nuestro artículo puedes ejecutar una disquisición y con placer lo observaremos.

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