fields.py 文件源码

def render_option(self, selected_choices, option_value, option_label):
        option_value = force_text(option_value)
        other_html = (u' selected="selected"'
                      if option_value in selected_choices else '')

        if callable(self.transform_html_attrs):
            html_attrs = self.transform_html_attrs(option_label)
            other_html += flatatt(html_attrs)

        if not isinstance(option_label, (six.string_types, Promise)):
            for data_attr in self.data_attrs:
                data_value = html.conditional_escape(
                    force_text(getattr(option_label,
                                       data_attr, "")))
                other_html += ' data-%s="%s"' % (data_attr, data_value)

            if callable(self.transform):
                option_label = self.transform(option_label)

        return u'<option value="%s"%s>%s</option>' % (
            html.escape(option_value), other_html,
            html.conditional_escape(force_text(option_label)))