Django表单字段选择，添加属性

Question

PLANNING_CHOICES = (
    ('0',u'Every morning'),
    ('1',u'Every night'),
    ('2',u'Never'),
)

    planning = forms.ChoiceField(
                                required=True,    
                                choices = PLANNING_CHOICES,
                                )

有一个这样的表单字段，名为Planning，我需要将title属性添加到选择中，最后渲染如下：

                <select>
                    <option value="0" title="bla1">Every morning</option>
                    <option value="1" title="bla2">Every night</option>
                    <option value="2" title="bla3">Never</option>
                </select>

如何实现？

Answer 1

你必须对该字段进行子类化，以采取任何方式指定你想要的标题以及显示新属性的小部件。

如果你有这样的事情（请注意：完全未经测试）：

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

class SelectWithTitles(forms.Select):
    def __init__(self, *args, **kwargs):
        super(SelectWithTitles, self).__init__(*args, **kwargs)
        # Ensure the titles dict exists
        self.titles = {}

    def render_option(self, selected_choices, option_value, option_label):
        title_html = (option_label in self.titles) and \
            u' title="%s" ' % escape(force_unicode(self.titles[option_label])) or ''
        option_value = force_unicode(option_value)
        selected_html = (option_value in selected_choices) and u' selected="selected"' or ''
        return u'<option value="%s"%s%s>%s</option>' % (
            escape(option_value), title_html, selected_html,
            conditional_escape(force_unicode(option_label)))

class ChoiceFieldWithTitles(forms.ChoiceField):
    widget = SelectWithTitles

    def __init__(self, choices=(), *args, **kwargs):
        choice_pairs = [(c[0], c[1]) for c in choices]
        super(ChoiceFieldWithTitles, self).__init__(choices=choice_pairs, *args, **kwargs)
        self.widget.titles = dict([(c[1], c[2]) for c in choices])

…你应该能够做到这一点：

PLANNING_CHOICES_WITH_TITLES = (
    ('0', 'Every morning', 'bla1'),
    ('1', 'Every night',   'bla2'),
    ('2', 'Never',         'bla3'),
)

planning = forms.ChoiceFieldWithTitles(
    required=True, choices=PLANNING_CHOICES_WITH_TITLES)