如何在django中向选项标签添加属性？

__init__

Meta

Select

render_option

class MySelect(forms.Select):
    def render_option(self, selected_choices, option_value, option_label):
        # look at the original for something to start with
        return u\'<option whatever>...</option>\'

class LocModelForm(forms.ModelForm):
    icons = forms.ModelChoiceField(
        queryset = Photo.objects.filter(galleries__title_slug = \"markers\"),
        widget = MySelect(attrs = {\'id\': \'mydds\'})
    )

    class Meta:
        # ...
        # note that if you override the entire field, you don\'t have to override
        # the widget here
    class Media:
        # ...

render_option

from django import forms

class CustomSelect(forms.Select):
    def __init__(self, *args, **kwargs):
        self.src = kwargs.pop(\'src\', {})
        super().__init__(*args, **kwargs)

    def create_option(self, name, value, label, selected, index, subindex=None, attrs=None):
        options = super(CustomSelect, self).create_option(name, value, label, selected, index, subindex=None, attrs=None)
        for k, v in self.src.items():
            options[\'attrs\'][k] = v[options[\'value\']]
        return options

class CustomForm(forms.Form):
    def __init__(self, *args, **kwargs):
        src = kwargs.pop(\'src\', {})
        choices = kwargs.pop(\'choices\', ())
        super().__init__(*args, **kwargs)
        if choices:
            self.fields[\'custom_field\'].widget = CustomSelect(attrs={\'class\': \'some-class\'}, src=src, choices=choices)

    custom_field = forms.CharField(max_length=100)

{\'form\': CustomForm(choices=choices, src=src)}

src

{\'attr-name\': {\'option_value\': \'attr_value\'}}

from django import forms
from django.utils.html import escape

class SelectWithTitle(forms.Select):
    def __init__(self, attrs=None, choices=(), option_title_field=\'\'):
        self.option_title_field = option_title_field
        super(SelectWithTitle, self).__init__(attrs, choices)

    def render_option(self, selected_choices, option_value, option_label, option_title=\'\'):
        print option_title
        option_value = forms.util.force_unicode(option_value)
        if option_value in selected_choices:
            selected_html = u\' selected=\"selected\"\'
            if not self.allow_multiple_selected:
                # Only allow for a single selection.
                selected_choices.remove(option_value)
        else:
            selected_html = \'\'
        return u\'<option title=\"%s\" value=\"%s\"%s>%s</option>\' % (
            escape(option_title), escape(option_value), selected_html,
            forms.util.conditional_escape(forms.util.force_unicode(option_label)))

    def render_options(self, choices, selected_choices):
            # Normalize to strings.
            selected_choices = set(forms.util.force_unicode(v) for v in selected_choices)
            choices = [(c[0], c[1], \'\') for c in choices]
            more_choices = [(c[0], c[1]) for c in self.choices]
            try:
                option_title_list = [val_list[0] for val_list in self.choices.queryset.values_list(self.option_title_field)]
                if len(more_choices) > len(option_title_list):
                    option_title_list = [\'\'] + option_title_list # pad for empty label field
                more_choices = [(c[0], c[1], option_title_list[more_choices.index(c)]) for c in more_choices]
            except:
                more_choices = [(c[0], c[1], \'\') for c in more_choices] # couldn\'t get title values
            output = []
            for option_value, option_label, option_title in chain(more_choices, choices):
                if isinstance(option_label, (list, tuple)):
                    output.append(u\'<optgroup label=\"%s\">\' % escape(forms.util.force_unicode(option_value)))
                    for option in option_label:
                        output.append(self.render_option(selected_choices, *option, **dict(option_title=option_title)))
                    output.append(u\'</optgroup>\')
                else: # option_label is just a string
                    output.append(self.render_option(selected_choices, option_value, option_label, option_title))
            return u\'\\n\'.join(output)

class LocModelForm(forms.ModelForm):
    icons = forms.ModelChoiceField(
        queryset = Photo.objects.filter(galleries__title_slug = \"markers\"),
        widget = SelectWithTitle(option_title_field=\'FIELD_NAME_HERE\')
    )

render_option

class MyForm(forms.ModelForm):
    project = ProjectModelChoiceField(label=_(\'Project\'), widget=ProjectSelect())

class ProjectModelChoiceIterator(django.forms.models.ModelChoiceIterator):
    def choice(self, obj):
        # return (self.field.prepare_value(obj), self.field.label_from_instance(obj)) #it used to be like this, but we need the extra context from the object not just the label. 
        return (self.field.prepare_value(obj), obj)

class ProjectModelChoiceField(django.forms.models.ModelChoiceField):
   def _get_choices(self):
       if hasattr(self, \'_choices\'):
           return self._choices
       return ProjectModelChoiceIterator(self)


class ProjectSelect(django.forms.Select):

    def create_option(self, name, value, label, selected, index, subindex=None, attrs=None):
        context = super(ProjectSelect, self).create_option(name, value, label, selected, index, subindex=None, attrs=None)

        context[\'attrs\'][\'extra-attribute\'] = label.extra_attribute #label is now an object, not just a string.
        return context

class IconSelectWidget(forms.Select):
    def create_option(self, name, value, *args, **kwargs):
        option = super().create_option(name, value, *args, **kwargs)
        if value:
            icon = self.choices.queryset.get(pk=value)  # get icon instance
            option[\'attrs\'][\'title\'] = icon.title  # set option attribute
        return option

class LocModelForm(forms.ModelForm):
    icons = forms.ModelChoiceField(
        queryset=Photo.objects.filter(galleries__title_slug=\'markers\'),
        widget=IconSelectWidget
    )

get_context

context[\'widget\'][\'optgroups\'][1][option_idx][\'attrs\']

class SelectWithData(widgets.Select):
    option_data = {}

    def __init__(self, attrs=None, choices=(), option_data={}):
        super(SelectWithData, self).__init__(attrs, choices)
        self.option_data = option_data

    def get_context(self, name, value, attrs):
        context = super(SelectWithData, self).get_context(name, value, attrs)
        for optgroup in context[\'widget\'].get(\'optgroups\', []):
            for option in optgroup[1]:
                for k, v in six.iteritems(self.option_data.get(option[\'value\'], {})):
                    option[\'attrs\'][\'data-\' + escape(k)] = escape(v)
        return context