指定小部件的类 [英] Specify Widget's class

问题描述

我有一个使用自定义小部件的字段的自定义表单。我需要设置小部件的类，目前我只能这样做：

I have a custom form with a field using a custom widget. I need to set the class of the widget, and currently I can only do it like this:

class DesignCampaignForm(ModelForm):

    brand_logo = FileField(widget=ImagePreviewWidget)
    brand_logo.widget.attrs['class'] = 'image-preview'

这意味着对于每个这样声明的小部件，我需要两行，并且一直重复该类 - 不是很干。

This means that for each widget declared like this I need two lines, and to repeat the class all the time - not very DRY.

有没有办法在窗口小部件本身中指定窗口小部件类？我在文档中找不到。

Is there a way to specify the widget class in the widget itself? I have been unable to find that in the documentation.

推荐答案

如果您希望该类在窗口小部件的所有实例中都可以，您可以覆盖（或修改）窗口小部件的 render 方法：

If you want the class to be there in all instances of the widget, you can override (or modify) the widget's render method:

class CustomImagePreviewWidget(ImagePreviewWidget):

    def render(self, name, value, attrs={}):
        attrs['class'] = 'image-preview'
        return super(CustomImagePreviewWidget, self).render(name, value, attrs)

然后在表单中使用 CustomImagePreviewWidget

再看一下，您还可以在小部件的 __ init __ 方法中执行此操作：

Looking at it some more, you can also do this in the widget's __init__ method:

class CustomImagePreviewWidget(ImagePreviewWidget):

    def __init__(self, attrs=None):
        super(CustomImagePreviewWidget, self).__init__(attrs)
        self.attrs['class'] = 'image-preview'

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