Django 表单字段选择,添加一个属性 [英] Django form field choices, adding an attribute
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问题描述
PLANNING_CHOICES = (
('0',u'Every morning'),
('1',u'Every night'),
('2',u'Never'),
)
planning = forms.ChoiceField(required=True, choices = PLANNING_CHOICES)
有一个名为planning的表单字段,我需要为选择添加标题属性,最后呈现为:
Having a such form field named planning, I need to add title attribute to choices and in the end renders as this:
<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?
推荐答案
您必须对该字段进行子类化,以采取任何方式指定您喜欢的标题和显示新属性的小部件.
You'd have to subclass the field to take whatever means of specifying the title you'd like and the widget to display the new attribute.
如果你有这样的东西(注意:完全未经测试):
If you had something like this (note: entirely untested):
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:
...you should be able to do this:
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)
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