Question

我有一张表格

class UploadForm(forms.Form):
    #...
    src_lang = forms.ChoiceField(choices=settings.LANGUAGES)
    tgt_lang = forms.ChoiceField(choices=settings.LANGUAGES)

并以这种方式设置src_lang的初始值：

uploadform = UploadForm(initial={'src_lang':'de'})
return render(request, 'upload.html', {'form':uploadform})

到目前为止，这么好。

现在我需要在渲染到模板之前从'de'过滤掉tgt_lang（以便tgt_lang不显示它）。我该怎么做？

Answer 1

您必须覆盖UploadForm的构造函数。像这样：

class UploadForm(forms.Form):
    ...
    def __init__(self, *args, **kwargs):
        super(UploadForm, self).__init__(*args, **kwargs)
        src_lang = self.initial.get('src_lang')
        if src_lang:
            choices = [(code, lang) for (code, lang) in settings.LANGUAGES
                                    if code != src_lang]
            self.fields['tgt_lang'].choices = choices
            self.fields['tgt_lang'].widget.choices = choices

Django表单 - 初始值过滤器

1 个答案: