python 可以使用 Django 表单进行可变数量的输入吗？
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Variable number of inputs with Django forms possible?
提问by Jiaaro
Is it possible to have a variable number of fields using django forms?
是否可以使用 django 表单拥有可变数量的字段？
The specific application is this:
具体应用是这样的：
A user can upload as many pictures as they want on the image upload form. Once the pictures are uploaded they are taken to a page where they can give the pictures a name and description. The number of pictures will depend on how many the user has chosen to upload.
用户可以在图片上传表单上上传任意数量的图片。图片上传后，它们会被带到一个页面，在那里他们可以为图片命名和描述。图片的数量将取决于用户选择上传的数量。
So how do I get django to generate a form using a variable number of input fields(which could be passed as an argument if necessary)?
那么如何让 django 使用可变数量的输入字段（如果需要，可以作为参数传递）来生成表单？
edit:a few things have changed since the article mentioned in jeff bauer's answerwas written.
编辑：自从jeff bauer 的回答中提到的文章撰写以来，一些事情发生了变化。
Namely this line of code which doesn't seem to work:
即这行代码似乎不起作用：
# BAD CODE DO NOT USE!!!
return type('ContactForm', [forms.BaseForm], { 'base_fields': fields })
So here is what I came up with...
所以这就是我想出的……
The Answer I used:
我使用的答案：
from tagging.forms import TagField
from django import forms
def make_tagPhotos_form(photoIdList):
"Expects a LIST of photo objects (ie. photo_sharing.models.photo)"
fields = {}
for id in photoIdList:
id = str(id)
fields[id+'_name'] = forms.CharField()
fields[id+'_tags'] = TagField()
fields[id+'_description'] = forms.CharField(widget=forms.Textarea)
return type('tagPhotos', (forms.BaseForm,), { 'base_fields': fields })
note tagging is not part of django, but it is free and very useful. check it out: django-tagging
注释标记不是 django 的一部分，但它是免费的并且非常有用。检查一下：django-标记
采纳答案by Jeff Bauer
Yes, it's possible to create forms dynamically in Django. You can even mix and match dynamic fields with normal fields.
是的，可以在 Django 中动态创建表单。您甚至可以将动态字段与普通字段混合搭配。
class EligibilityForm(forms.Form):
def __init__(self, *args, **kwargs):
super(EligibilityForm, self).__init__(*args, **kwargs)
# dynamic fields here ...
self.fields['plan_id'] = CharField()
# normal fields here ...
date_requested = DateField()
For a better elaboration of this technique, see James Bennett's article: So you want a dynamic form?
为了更好地阐述这项技术，请参阅 James Bennett 的文章：So you want a dynamic form?
回答by Alcides
If you run
如果你跑
python manage.py shell
and type:
并输入：
from app.forms import PictureForm
p = PictureForm()
p.fields
type(p.fields)
you'll see that p.fields is a SortedDict. you just have to insert a new field. Something like
你会看到 p.fields 是一个 SortedDict。你只需要插入一个新字段。就像是
p.fields.insert(len(p.fields)-2, 'fieldname', Field())
In this case it would insert before the last field, a new field. You should now adapt to your code.
在这种情况下，它将在最后一个字段之前插入一个新字段。您现在应该适应您的代码。
Other alternative is to make a for/while loop in your template and do the form in HTML, but django forms rock for some reason, right?
另一种选择是在你的模板中创建一个 for/while 循环并在 HTML 中执行表单，但是 django 表单由于某种原因而摇摆不定，对吗？
回答by user51463
Use either multiple forms (django.forms.Form not the tag)
使用多种形式（django.forms.Form 不是标签）
class Foo(forms.Form):
field = forms.Charfield()
forms = [Foo(prefix=i) for i in xrange(x)]
or add multiple fields to the form dynamically using self.fields.
或者使用 self.fields 动态地向表单添加多个字段。
class Bar(forms.Form):
def __init__(self, fields, *args, **kwargs):
super(Bar, self).__init__(*args, **kwargs)
for i in xrange(fields):
self.fields['my_field_%i' % i] = forms.Charfield()
