这是我的观点:
def main_page(request):
if request.method == 'POST':
form = RegistrationForm(request.POST)
if form.is_valid():
user = User.objects.create_user(
username=form.clean_data['username'],
password=form.clean_data['password1'],
email=form.clean_data['email']
)
return HttpResponseRedirect('/')
else:
form = RegistrationForm()
variables = {
'form': form
}
return render(request, 'main_page.html', variables)
这是我的 main_page.html:
{% if form.errors %}
<p>NOT VALID</p>
{% for errors in form.errors %}
{{ errors }}
{% endfor %}
{% endif %}
<form method="post" action="/">{% csrf_token %}
<p><label for="id_username">Username:</label>{{ form.username }}</p>
<p><label for="id_email">Email Address:</label>{{ form.email }}</p>
<p><label for="id_password">Password:</label>{{ form.password1 }}</p>
<p><label for="id_retypePassword">Retype Password:</label>{{ form.password2 }}</p>
<input type="hidden" name="next" />
<input type="submit" value="Register" />
</form>
当我转到使用 main_page View 的 url 时,它只显示表单。当我提交有错误的表单(带有空白字段且没有正确的电子邮件地址)时,它只会将我重定向到同一页面并且不显示任何错误。它甚至没有说“无效”。
当我改变
{% if form.errors %}
到
{% if not form.is_valid %}
它总是说“无效”(即使这是第一次访问该网址,即使我还没有提交任何内容)。
这是我的注册表:
from django import forms
import re
from django.contrib.auth.models import User
from django.core.exceptions import ObjectDoesNotExist
class RegistrationForm(forms.Form):
username = forms.CharField(label='Username', max_length=30)
email = forms.EmailField(label='Email')
password1 = forms.CharField(label='Password', widget=forms.PasswordInput())
password2 = forms.CharField(label='Password (Again)', widget=forms.PasswordInput())
def clean_password2(self):
if 'password1' in self.cleaned_data:
password1 = self.cleaned_data['password1']
password2 = self.cleaned_data['password2']
if password1 == password2:
return password2
raise forms.ValidationError('Passwords do not match.')
def clean_username(self):
username = self.cleaned_data['username']
if not re.search(r'^\w+$', username): #checks if all the characters in username are in the regex. If they aren't, it returns None
raise forms.ValidationError('Username can only contain alphanumeric characters and the underscore.')
try:
User.objects.get(username=username) #this raises an ObjectDoesNotExist exception if it doesn't find a user with that username
except ObjectDoesNotExist:
return username #if username doesn't exist, this is good. We can create the username
raise forms.ValidationError('Username is already taken.')
最佳答案
它正在重定向您,因为您总是返回 HttpResponseRedirect
如果方法是 POST,即使表单无效。尝试这个:
def main_page(request):
form = RegistrationForm()
if request.method == 'POST':
form = RegistrationForm(request.POST)
if form.is_valid():
user = User.objects.create_user(
username=form.clean_data['username'],
password=form.clean_data['password1'],
email=form.clean_data['email']
)
return HttpResponseRedirect('/')
variables = {
'form': form
}
return render(request, 'main_page.html', variables)
这样,表单实例,在其中
is_valid
被调用,被传递给模板,它有机会显示错误。只有当表单有效时,用户才会被重定向。如果你想变得花哨,请使用 messages framework 添加一条消息在重定向之前。如果你想让它更简洁一点:
def main_page(request):
form = RegistrationForm(request.POST or None)
if form.is_valid():
user = User.objects.create_user(
username=form.clean_data['username'],
password=form.clean_data['password1'],
email=form.clean_data['email']
)
return HttpResponseRedirect('/')
variables = {
'form': form
}
return render(request, 'main_page.html', variables)
关于django - 如何让 Django View 返回表单错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21126005/