Django, setting selected="selected" on a radio input

Question

A simple form with ModelChoiceField displayed as radio buttons (the inherited widget).

I'm using an onchange event to POST, everytime a user selects a radio button:

shipping_choice = ShippingChoiceField(
 queryset=ShippingMethods.objects.all(),
 empty_label=None,
 widget=forms.RadioSelect(attrs={
  'class': 'order',
  'onchange': '$("#shipping_choice").submit()',
 })
)

I need to have the radio that the user selected thought, actually be "selected" when the page reloads.

Adding an extra attr 'selected', will not do, 'cause it needs to happen when the user actually has made a choice first.

Answer 1

Forms have an initial attribute which you can use:

form = YourForm(initial={'shipping_choice': current_choice})

Then again, I'm guessing you are using a ModelForm, in which case you should just be passing the instance:

form = YourForm(instance=order)   # where "order" is your instance...

Or maybe you just don't understand that a form can be bound to data:

if request.method == 'POST':
    order_form = YourForm(data=request.POST)
else:
    order_form = YourForm()

Answer 2

Your question and subsequent comment aren't clear, unfortunately. What do you mean by displaying it 'when the form resubmits'?

Usually the flow is display the form, submit, redisplay it if there are any errors, then proceed to a confirmation page. At what point are you having problems? Or is your flow significantly differet form this?