Abh*_*lla 14 python django django-class-based-views
我有一个QuestionView派生自FormView班级的班级.这是一个代码片段来解释我的问题:
class QuestionView(FormView):
...
context_var1 = y
def form_valid (self, form):
...
self.context_var1 = x
...
def get_context_data(self, **kwargs):
...
context['context_var1'] = self.context_var1
...
return context
如上所示,我更新了一组上下文变量form_valid,我打算在模板中使用这些变量的值 - 因此是context字典中的变量.这段代码的问题context_var1在于没有看到更改
- 可能是因为get_context_data在form_valid方法之前调用了.这有解决方法吗？
jor*_*lli 25
我这样做form_invalid.我是这样做的:
from django.views.generic import FormView
class ContextFormView(FormView):
def get(self, request, *args, **kwargs):
form_class = self.get_form_class()
form = self.get_form(form_class)
context = self.get_context_data(**kwargs)
context['form'] = form
return self.render_to_response(context)
def post(self, request, *args, **kwargs):
form_class = self.get_form_class()
form = self.get_form(form_class)
if form.is_valid():
return self.form_valid(form)
else:
return self.form_invalid(form, **kwargs)
def form_invalid(self, form, **kwargs):
context = self.get_context_data(**kwargs)
context['form'] = form
return self.render_to_response(context)
你可以做同样的事情,但对于form_valid.通常,form_valid的主体如下所示:
def form_valid(self, form):
return HttpResponseRedirect(self.get_success_url())
您必须覆盖两个post和form_valid,因为post调用form_valid.
def post(self, request, *args, **kwargs):
form_class = self.get_form_class()
form = self.get_form(form_class)
if form.is_valid():
return self.form_valid(form, **kwargs)
else:
return self.form_invalid(form, **kwargs)
def form_valid(self, form, **kwargs):
# take some other action here
return HttpResponseRedirect(self.get_success_url())
哦,只是为了澄清,这个问题存在的原因是ProcessFormView类的get方法被打破了.它通常看起来像这样:
def get(self, request, *args, **kwargs):
form_class = self.get_form_class()
form = self.get_form(form_class)
return self.render_to_response(self.get_context_data(form=form))
它只是把钱扔掉了 (._.)
小智 5
在views.py中
class UploadTest(FormView):
template_name = 'test.html'
....
plus_context = dict()
def form_valid(self, form):
...
self.plus_context['you_want_context'] = value
...
return super(UploadTest, self).form_valid(form)
def get_context_data(self, **kwargs):
context = super(UploadTest, self).get_context_data(**kwargs)
context['plus_context_key'] = self.plus_context
return context
在测试.html中
<html>
....
<body>
....
// first post can not get plus_context_key
{% if plus_context_key %}
{{ plus_context_key.you_want_context }}
{% endif %}
</body>
</html>
我刚刚在 Django 1.10.3 中找到了这种方法。希望能帮到你
小智 5
在Django 2.0.1中，您可以通过覆盖get_context_data或插入上下文数据form_invalid。
根据您的情况，您可以执行以下替代之一：
class QuestionView(FormView):
...
def form_invalid(self, form):
"""If the form is invalid, render the invalid form."""
return self.render_to_response(
self.get_context_data(
form=form,
context_key=some_value
)
)
要么：
class QuestionView(FormView):
...
def get_context_data(self, **kwargs):
if 'context_key' not in kwargs: # set value if not present
kwargs['context_key'] = some_value
return super().get_context_data(**kwargs)
Django 2.0.1将表格插入到的kwargs中get_context_data。
# File: django.views.generic.edit
class FormMixin(ContextMixin):
...
def form_valid(self, form):
"""If the form is valid, redirect to the supplied URL."""
return HttpResponseRedirect(self.get_success_url())
def form_invalid(self, form):
"""If the form is invalid, render the invalid form."""
return self.render_to_response(self.get_context_data(form=form))
def get_context_data(self, **kwargs):
"""Insert the form into the context dict."""
if 'form' not in kwargs:
kwargs['form'] = self.get_form()
return super().get_context_data(**kwargs)
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