我遇到一个奇怪的问题,我似乎无法在django中设置表单中某个字段的初始值。
我的模型字段是:
section = models.CharField(max_length=255, choices=(('Application', 'Application'),('Properly Made', 'Properly Made'), ('Changes Application', 'Changes Application'), ('Changes Approval', 'Changes Approval'), ('Changes Withdrawal', 'Changes Withdrawal'), ('Changes Extension', 'Changes Extension')))
我的表单代码是:
class FeeChargeForm(forms.ModelForm):
class Meta:
model = FeeCharge
# exclude = [] # uncomment this line and specify any field to exclude it from the form
def __init__(self, *args, **kwargs):
super(FeeChargeForm, self).__init__(*args, **kwargs)
self.fields['received_date'] = forms.DateField(('%d/%m/%Y',), widget=forms.DateTimeInput(format='%d/%m/%Y', attrs={'class': 'date'}))
self.fields['comments'].widget.attrs['class']='html'
self.fields['infrastructure_comments'].widget.attrs['class']='html'
我的观看代码是:
form = FeeChargeForm(request.POST or None)
form.fields['section'].initial = section
其中section是传递给函数的url var。我试过了:
form.fields['section'].initial = [(section,section)]
没有运气:(
任何想法我做错了或者是否有更好的方法从url var设置此选择字段的默认值(在表单提交之前)?
提前致谢!
更新:这似乎与网址变量有关..如果我使用:
form.fields['section'].initial = "Changes Approval"
它工作np ..如果我HttpResponse(部分)它正确地输出。
答案 0 :(得分:2)
问题是使用request.POST和initial = {'section':section_instance.id})。发生这种情况是因为request.POST的值总是覆盖参数“initial”的值,所以我们必须将它分开。我的解决方案是使用这种方式。
在views.py中:
if request.method == "POST":
form=FeeChargeForm(request.POST)
else:
form=FeeChargeForm()
在forms.py中:
class FeeChargeForm(ModelForm):
section_instance = ... #get instance desired from Model
name= ModelChoiceField(queryset=OtherModel.objects.all(), initial={'section': section_instance.id})
----------或----------
在views.py中:
if request.method == "POST":
form=FeeChargeForm(request.POST)
else:
section_instance = ... #get instance desired from Model
form=FeeChargeForm(initial={'section': section_instance.id})
在forms.py中:
class FeeChargeForm(ModelForm):
name= ModelChoiceField(queryset=OtherModel.objects.all())
答案 1 :(得分:0)
UPDATE 尝试转义您的网址。以下SO答案和文章应该有所帮助:
How to percent-encode URL parameters in Python?
http://www.saltycrane.com/blog/2008/10/how-escape-percent-encode-url-python/
尝试按如下方式设置该字段的初始值,看看是否有效:
form = FeeChargeForm(initial={'section': section})
我假设您在用户发布表单时会做很多其他事情,因此您可以使用以下内容将POST表单与标准表单分开:
if request.method == 'POST':
form = FeeChargeForm(request.POST)
form = FeeChargeForm(initial={'section': section})