在 Django 上所需的 selectDateWidget 上显示 empty_label [英] Display empty_label on required selectDateWidget on Django

问题描述

根据 Django 在 SelectDateWidget 上的文档 (https://docs.djangoproject.com/en/1.8/ref/forms/widgets/#selectdatewidget)，如果不需要 DateField，将显示 empty_label.我注意到如果 DateField 是必需的，小部件上的默认值将是 January、1 和 ;.有没有办法使 DateField 成为必需，但在初始表单上显示带有 empty_label(例如 -----)的小部件?

According to Django's Doc on SelectDateWidget (https://docs.djangoproject.com/en/1.8/ref/forms/widgets/#selectdatewidget), the empty_label will be shown if the DateField is not required. I noticed if the DateField is required, the default value on the widget will be January, 1, and <current-year>. Is there a way to make the DateField required, but showing the widget with empty_label (such as -----) on the initial form?

推荐答案

不幸的是，SelectDateWidget 中的空标签仅在不需要字段时使用，但您可以通过子类化 来简单地更改此设置SelectDateWidget 和覆盖 create_select 方法:

Unfortunately, empty label in SelectDateWidget is only used if field is not required, but you can simply change this by subclassing SelectDateWidget and overriding create_select method:

class MySelectDateWidget(SelectDateWidget):

    def create_select(self, *args, **kwargs):
        old_state = self.is_required
        self.is_required = False
        result = super(MySelectDateWidget, self).create_select(*args, **kwargs)
        self.is_required = old_state
        return result

但在这种情况下，您可能还必须覆盖对您的字段的验证，因此它会抛出该字段是必需的错误，而不是当 select 保留为空白值时该选择无效.

But in that case you may have to override also validation of your field, so it will throw error that field is required, not that choice is invalid when select is left on blank value.

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