Django:动态IntegerField初始(呈现空)
问题描述:
我需要一个整数表单字段有一个'默认'值。但是我需要在运行时定义这个值。Django:动态IntegerField初始(呈现空)
我不喜欢它的部份:
# at my form constructor:
def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None, initial=None, error_class=ErrorList,
label_suffix=':', empty_permitted=False):
super(FlatSearchForm, self).__init__(data, files, auto_id, prefix, initial, error_class, label_suffix,
empty_permitted)
min_price = ... # some code to find the minimum price
self.price_min = min_price # will be used later
max_price = ... # some code to find the maximum price
self.price_max = max_price
# here we go:
self.fields['price_from'] = forms.IntegerField(min_value=min_price, max_value=max_price, initial=min_price)
self.fields['price_to'] = forms.IntegerField(min_value=min_price, max_value=max_price, initial=max_price)
# ...
# how I use the form (in views.py):
class SearchFlatView(ListView):
model = Flat
context_object_name = 'flats'
template_name = 'catalog/search.html'
def get_context_data(self, **kwargs):
context = super(SearchFlatView, self).get_context_data(**kwargs)
context['form'] = FlatSearchForm(self.request.GET)
return context
的问题是:值未在表格所示,当我渲染使用{{form.price_from}}和场{{form.price_to}} - 这些领域只是空的!
你能告诉我我做错了什么吗?
答
您无法为绑定形式的字段动态设置初始值。请参阅该文档:https://docs.djangoproject.com/en/dev/ref/forms/fields/#initial
初始参数让你指定的时候 未绑定的形式呈现本场使用的初始值。
什么,但是你可以做的是建立一个绑定形式,仍然保留PARAMS request.GET中:
initial = request.GET.copy()
initial['price_from'] = some_min_price
initial['price_to'] = some_max_price
context['form'] = FlatSearchForm(initial=initial)
虽然在形式__iniit__你必须:
def __init__(self, *args, **kwargs):
super(Form, self).__init__(*args, **kwargs)
initial = kwargs.get("initial", {})
default_min_value = ... # some default value in case there is no `initial` passed
default_max_value = ...
self.fields['price_from'] = forms.IntegerField(min_value=initial.get('min_value', default_min_value), max_value=initial.get('max_value', default_max_value))
self.fields['price_to'] = forms.IntegerField(min_value=initial.get('min_value', default_min_value), max_value=initial.get('max_value', default_max_value))
或者您可能需要更改此逻辑。
你如何使用表格?你如何实例化它?它是绑定还是非绑定? – Tisho 2012-07-13 08:34:41
更新了代码。一探究竟。 – 2012-07-13 08:40:49