Question

我有一个用户登录表格

class PersonLoginForm(forms.Form):
    username = forms.CharField(max_length=20, required=True)
    password = forms.CharField(max_length=100, required=True)

    def clean_password(self):
        user = Person.objects.get(username=self.cleaned_data['username'])
        if not user.check_password(self.cleaned_data['password']):
            self.add_error('password', 'That password is incorrect!')
        return self.cleaned_data

我在那里检查密码是否正确，以便让错误消息出现在模板中我这样访问模板中的错误消息

<div class="field-wrapper">
     {% render_field form.password.errors %}
     {% render_field form.password.label_tag %}
     {% render_field form.password placeholder='password...' type='password'%}
</div>

但是错误消息没有出现！这是登录表单的视图

def user_login(request):
    if request.method == 'POST':
        form = PersonLoginForm(request.POST)
        if form.is_valid():
            username = form.cleaned_data['username']
            password = form.cleaned_data['password']
            user = authenticate(username=username, password=password)
            if user is not None:
                login(request, user)
                messages.success(request, 'Successfully logged in!')
                return redirect('all_users')
        print(form.errors)

    form = PersonLoginForm()
    context = {
        'form': form,
        'title': 'Login',
    }
    return render(request, 'index/login.html', context)

我在form.is_valid()评估为False后打印它

<ul class="errorlist"><li>password<ul class="errorlist"><li>That password is incorrect!</li></ul></li></ul>

它甚至没有显示在模板中

Answer 1

您可以做的是，当您的请求方法为GET时，将此新表单form = PersonLoginForm（）添加到else语句中，以保持空表单。通过添加else语句，您可以避免表单的新分配。验证过程结束后，它将跳至包含所有验证错误的表单实例的render（request，....）

def user_login(request):
if request.method == 'POST':
    form = PersonLoginForm(request.POST)
    if form.is_valid():
        username = form.cleaned_data['username']
        password = form.cleaned_data['password']
        user = authenticate(username=username, password=password)
        if user is not None:
            login(request, user)
            messages.success(request, 'Successfully logged in!')
            return redirect('all_users')
    print(form.errors)

else:
    form = PersonLoginForm()
context = {
    'form': form,
    'title': 'Login',
}
return render(request, 'index/login.html', context)

为什么我的表单错误没有显示在模板中？

1 个答案: