没有必要建立任何东西(至少在服务器上侧) - WTForms已经支持你所需要的 - 它叫他们"field enclosures"。您正在寻找的行为wtforms.fields.FormField
被发现,wtforms.fields.FieldList
class ContactForm(Form):
name = TextField("Name", validators=[Required()])
contact_type = SelectField("Contact Type",
validators=[Required()],
choices=[
("email", "Email"),
("phone", "Phone Number"),
("im", "Instant Message")
])
# `If` is a custom validator - see below
email_address = TextField("Email",
validators=[If("contact_type",
"email",
[Required(), Email()])
])
phone_number = TextField("Phone #",
validators=[If("contact_type",
"phone", [Required()])
])
im_handle = TextField("IM Handle",
validators=[If("contact_type",
"im", [Required()])
])
class SignUpForm(Form):
# Other fields go here
contacts = FieldList(FormField(ContactForm))
您还需要一个custom validator验证相应的字段,给用户的选择:
# CAUTION: Untested code ahead
class If(object):
def __init__(self,
parent,
run_validation=None,
extra_validators=None,
msg=None):
self.parent = parent
self.msg = msg if msg is not None else u"Invalid"
if callable(run_validation):
self.run_validation = run_validation
else:
_run_validation = lambda self, parent, form: parent.data == run_validation
self.run_validation = _run_validation
self.extra_validators = extra_validators if extra_validators is not None \
else []
def __call__(self, field, form):
parent = getattr(form, self.parent)
if self.run_validation(parent, form):
return field.validate(form, extra_validators=self.extra_validators)
当你在打电话form.validate()
服务器端将根据需求自动检查字段,错误将被适当地填充,以便您可以将它们呈现在客户端。
在客户端创建新字段很简单,只要您命名为using the same naming convention it uses - 即field.short_name + '-' + index
,WTForms将在后端选择它们。
Flask让你可以很容易地迭代'POST'数据。你应该阅读一下文档,看看是否有帮助。 – Blender 2012-07-09 20:32:08
是的,我对此很熟悉。我主要关心的是如果某些事情弄糟了,返回的数据。 – Pwnna 2012-07-09 20:35:43
根据收到的服务器返回的信息,客户端不会丢失它,您可以使用Flash消息(适用于从服务器到客户端的一次性'post')。 – darkphoenix 2012-07-09 20:53:10