In Django form, custom SelectField and SelectMultipleField

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野趣味 2021-01-02 16:11

I am using Django everyday now for three month and it is really great. Fast web application development.

I have still one thing that I cannot do exactly how I want t

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庸人自扰 (楼主)

2021-01-02 16:46

render_option has been removed from Django 1.11 onwards. This is what I did to achieve this. A little bit of digging and this seems straightforward and neat. Works with Django 2.0+

class CustomSelect(forms.Select):
    def __init__(self, attrs=None, choices=()):
        self.custom_attrs = {}
        super().__init__(attrs, choices)

    def create_option(self, name, value, label, selected, index, subindex=None, attrs=None):
        index = str(index) if subindex is None else "%s_%s" % (index, subindex)
        if attrs is None:
            attrs = {}
        option_attrs = self.build_attrs(self.attrs, attrs) if self.option_inherits_attrs else {}
        if selected:
            option_attrs.update(self.checked_attribute)
        if 'id' in option_attrs:
            option_attrs['id'] = self.id_for_label(option_attrs['id'], index)

        # setting the attributes here for the option
        if len(self.custom_attrs) > 0:
            if value in self.custom_attrs:
                custom_attr = self.custom_attrs[value]
                for k, v in custom_attr.items():
                    option_attrs.update({k: v})

        return {
            'name': name,
            'value': value,
            'label': label,
            'selected': selected,
            'index': index,
            'attrs': option_attrs,
            'type': self.input_type,
            'template_name': self.option_template_name,
        }


class MyModelChoiceField(ModelChoiceField):

    # custom method to label the option field
    def label_from_instance(self, obj):
        # since the object is accessible here you can set the extra attributes
        if hasattr(obj, 'type'):
            self.widget.custom_attrs.update({obj.pk: {'type': obj.type}})
        return obj.get_display_name()

The form:

class BookingForm(forms.ModelForm):

    customer = MyModelChoiceField(required=True,
                                  queryset=Customer.objects.filter(is_active=True).order_by('name'),
                                  widget=CustomSelect(attrs={'class': 'chosen-select'}))

The output which I needed is as:


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