django 没有在表单中显示 error_messages

Question

我是 django 的新手，我正在处理这个表单，我已经尝试了所有可能的方法，但我似乎无法显示表单错误消息。我尝试使用 def clean 方法，当我尝试提交空表单时没有任何反应。我厌倦了使用 FormView 我也尝试使用函数视图我尝试使用 for 循环并添加 {{ form.non_field_errors }}在我的模板中没有弹出任何内容。

我的应用程序/forms.py

from django import forms

class ContactForm(forms.Form):

    name = forms.CharField( label='Your Name', min_length=2, max_length=25, required=True, error_messages ={'required':'Please tell Oluwafemi your name'})
    email = forms.EmailField(label='Your Email', required=True, error_messages={'invalid':'Please fill in a valid email'})
    subject = forms.CharField(label='Subject', min_length=4, max_length=100, required=True)
    message = forms.CharField(widget=forms.Textarea(attrs={'placeholder':'Write Oluwafemi a Message'}), error_messages ={'required':'Please write something for Oluwafemi'})

我的应用/views.py

from django.views.generic import TemplateView
from django.shortcuts import render
from django.core.mail import send_mail
from .forms import ContactForm
from django.http import HttpResponseRedirect

# Create your views here.
class ProfilePageView(TemplateView):
    template_name = 'femi_profile.html'
    form_class = ContactForm
    success_url = 'femiir'

    def get(self, request, *args, **kwargs):
        form = self.form_class()
        return render(request, self.template_name, {'form': form})

    def post(self, request, *args, **kwargs):
        form = self.form_class(request.POST)

        if form.is_valid():
            name = form.cleaned_data['name']
            email = form.cleaned_data['email']
            subject = form.cleaned_data['subject']
            message = form.cleaned_data['message']

            # Send the email
            send_mail(
                f"{subject} - message from {name} ", # message subject
                message, # Message Body
                email, # Sender's mail (From mail)
                ['d4rahl@gmail.com'], # Reciever's mail(To mail)
            )

            return HttpResponseRedirect('femiir')


        return render(request, self.template_name, {'form': form})

我的html模板的sn-p

<div class="col-lg-7 mt-5 mt-lg-0 d-flex align-items-stretch">
            <form method="post">
              {% csrf_token %}
              
              <div class="form-row">
                <div class="form-group col-md-6">
                  {{ form.name|as_crispy_field }}
                </div>
                <div class="form-group col-md-6">
                  {{ form.email|as_crispy_field }}
                </div>
              </div>
              <div class="form-group">
                {{ form.subject|as_crispy_field }}
                {{ form.message|as_crispy_field }}
              </div>
              <div class="text-center"><button type="submit" class="btn btn-primary ">Send Message</button></div>
            </form>
          </div>

请问我做错了什么

Answer 1

您是否尝试循环遍历模板中的 form.errors？

{% if form.errors %}
    {% for field in form %}
        {% for error in field.errors %}
          {{ error }}  
        {% endfor %}
    {% endfor %}
    {% for error in form.non_field_errors %}
        {{ error }}
    {% endfor %}
{% endif %}

Answer 2

当您手动呈现字段时，您将不得不使用错误标签。

{{ form.name_of_field.errors }}

        <form method="post">
           {% csrf_token %}
          
          <div class="form-row">
            <div class="form-group col-md-6">
              {{ form.name|as_crispy_field }}
              {{ form.name.errors}}

            </div>
            <div class="form-group col-md-6">
              {{ form.email|as_crispy_field }}
              {{ form.email.errors}}

            </div>
          </div>
          <div class="form-group">
            {{ form.subject|as_crispy_field }}
              {{ form.subject.errors}}

            {{ form.message|as_crispy_field }}
              {{ form.message.errors}}

          </div>
          <div class="text-center"><button type="submit" class="btn btn-primary ">Send Message</button></div>
        </form>

https://docs.djangoproject.com/en/dev/topics/forms/#rendering-fields-manually