HTML allows an option in a <select> to be disabled. In other words it will appear in the list of choices but won't be selectable. This is done by adding a 'disabled' attribute to the <option> tag, for example:
`<option value="" disabled="disabled">Disabled option</option>`
This code subclasses the regular Django Select widget, overriding the render_option method to allow disabling options.
Example of usage:
class FruitForm(forms.Form):
choices = (('apples', 'Apples'),
('oranges', 'Oranges'),
('bananas', {'label': 'Bananas',
'disabled': True}), # Yes, we have no bananas
('grobblefruit', 'Grobblefruit'))
fruit = forms.ChoiceField(choices=choices, widget=SelectWithDisabled())