前端或后端Django上的表单验证

from django import forms

class ContactForm(forms.Form):
    name = forms.CharField(max_length=100)
    email = forms.EmailField()
    message = forms.CharField(widget=forms.Textarea)

    def clean_name(self):
        name = self.cleaned_data['name']
        if len(name) < 3:
            raise forms.ValidationError("Name must be at least 3 characters long.")
        return name

    def clean(self):
        cleaned_data = super().clean()
        email = cleaned_data.get('email')
        message = cleaned_data.get('message')

        if email and message and "spam" in message.lower():
            self.add_error('message', "Message contains spam words.")

from django.shortcuts import render
from .forms import ContactForm

def contact(request):
    if request.method == 'POST':
        form = ContactForm(request.POST)
        if form.is_valid():
            # 处理有效数据
            pass
    else:
        form = ContactForm()
    return render(request, 'contact.html', {'form': form})

<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <button type="submit">Submit</button>
</form>