Django设置默认的表单值

我有一个模型如下:

class TankJournal(models.Model):
    user = models.ForeignKey(User)
    tank = models.ForeignKey(TankProfile)
    ts = models.IntegerField(max_length=15)
    title = models.CharField(max_length=50)
    body = models.TextField()

我也有上面模型的模型表单如下:

class JournalForm(ModelForm):
    tank = forms.IntegerField(widget=forms.HiddenInput()) 

    class Meta:
        model = TankJournal
        exclude = ('user','ts')

我想知道如何设置坦克隐藏字段的默认值。下面是到目前为止显示/保存表单的函数:

def addJournal(request, id=0):
    if not request.user.is_authenticated():
        return HttpResponseRedirect('/')

    # checking if they own the tank
    from django.contrib.auth.models import User
    user = User.objects.get(pk=request.session['id'])

    if request.method == 'POST':
        form = JournalForm(request.POST)
        if form.is_valid():
            obj = form.save(commit=False)

            # setting the user and ts
            from time import time
            obj.ts = int(time())
            obj.user = user

            obj.tank = TankProfile.objects.get(pk=form.cleaned_data['tank_id'])

            # saving the test
            obj.save()

    else:
        form = JournalForm()

    try:
        tank = TankProfile.objects.get(user=user, id=id)
    except TankProfile.DoesNotExist:
        return HttpResponseRedirect('/error/')

当前回答

你可以使用Form。首字母，这里有解释。

你有两个选择，要么填充值时调用表单构造函数:

form = JournalForm(initial={'tank': 123})

或者在表单定义中设置该值:

tank = forms.IntegerField(widget=forms.HiddenInput(), initial=123)

2009-03-02 22:29:46

其他回答

我希望这能帮助到你:

form.instance.updatedby = form.cleaned_data['updatedby'] = request.user.id

2020-03-06 08:23:06

其他解决方案:创建表单后设置初始值:

form.fields['tank'].initial = 123

2018-03-30 13:39:42

在开发过程中，我还遇到了在表单中设置默认值的需要。我的解决方案是

initial={"":""}
form=ArticleModel(request.POST)
if form.has_changed():
    data = {i: form.cleaned_data[i] for i in form.changed_data}
    data.update({key: val for key, val in init_praram.items() if key not in form.changed_data})

使用的形式。Has_changed,if form。字段，您可以使用此方法

2021-03-25 10:47:03

如何在表单中添加首字母: 我读了@Sergey Golovchenko的回答。

所以我只是在if request中添加了它。method == 'POST':。但如果您想在发布表单之前查看它的值，则不能将它放在这里。你需要把它放到else的形式里。

示例来自views.py

def myForm(request):
    kontext = {}

    if request.method == 'POST':
        # You might want to use clean_data instead of initial here. I found something on a stack overflow question, and you add clean data to the Forms.py, if you want to change the post data. https://stackoverflow.com/questions/36711229/django-forms-clean-data
        form = myModelForm(request.POST, initial={'user': request.user})
        if form.is_valid():
            form.save()
            return redirect('/')
    else:
        # you need to put initial here, if you want to see the value before you post it
        form = myModelForm(initial={'user': request.user})
    kontext['form'] = form
    return render(request, 'app1/my_form.html', kontext)

2022-07-26 06:01:01

正如Django文档中解释的那样，initial并不是默认值。

字段的初始值将显示在HTML中。但是如果用户删除了这个值，并且最后为这个字段返回一个空值，初始值将丢失。因此，您无法获得默认行为所期望的结果。默认行为是:如果数据参数不包含字段的任何值，验证过程将采用的值。

要实现这一点，一个简单的方法是结合initial和clean_<field>():

class JournalForm(ModelForm):
    tank = forms.IntegerField(widget=forms.HiddenInput(), initial=123) 

    (...)

    def clean_tank(self):
        if not self['tank'].html_name in self.data:
            return self.fields['tank'].initial
        return self.cleaned_data['tank']

2020-05-13 11:51:44

Django设置默认的表单值

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