Django form（表单）的验证以及错误提示

Question

我想用Django的form实现一个简单的用户注册功能，目前完成的界面如下：

我想完善的功能是当用户输入内容有误时，点击注册之后会在相应字段后面出现一个错误提示，就像Segmentfault的登录一样，密码错误下面会有简单的提示，如下：

我的部分代码如下，

forms.py

class SignupForm(forms.Form):
    username = forms.CahrField(
        label=_("username"),
        max_length=30,
    )

    email = forms.EmailField(label=_('email'),)
    password_1 = forms.CharField(
        label=_("password"),
        widget=forms.PasswordInput,
    )
    password_2 = forms.CharField(
        label=_("password_confirmed"),
        widget=forms.PasswordInput,
    )

    def clean_password_2(self):
        password_1 = self.cleaned_data.get("password_1")
        password_2 = self.cleaned_data.get("password_2")
        if password_1 and password_2 and password_1 != password_2:
            raise forms.ValidationError(_('password confirm failed'))
        return password_2

signup.html

<form method="post" action="{% url 'accounts:signup_post' %}">
    {% csrf_token %}
    <table>
    {% for field in form %}
        <tr>
            <td>{{ field.label_tag }}</td>
            <td>{{ field }}</td>
            <td>{{ field.errors }}</td>
        </tr>
    {% endfor %}
    </table>

    <input type='submit' id="submit" value={% trans "signup" %}>
    <a href="{% url 'accounts:login' %}">{% trans "Already have accounts?" %}</a>
</form>

views.py

def signup_post(request):
    if request.method == 'POST':
        signup_form = forms.SignupForm(request.POST)

        if signup_form.is_valid():
            signup_info = signup_form.cleaned_data
            username = signup_info['username']
            email = signup_info['email']
            password = signup_info['password_1']
            user = User.objects.create_user(
                username=username,
                email=email,
                password=password)
            user.save()
            # 重定向到首页（暂时没写）
        else:
            # 估计是这里的问题，但不知道怎么改正
            return redirect(reverse("accounts:signup"))

    else:
        signup_form = forms.SignupForm()

    return render(reverse("accounts:signup"), {'form': signup_form})

目前只是想简单验证两次输入密码是否一致，参考文档写了 clean_ 函数，但是没有成功。我猜测是views 中 signup_form.is_valid() 失败之后返回页面时需要带上form，但是不知道怎么做。

已经读了Django文档中Form部分的内容，但是仍旧找不到解决方法。

Answer 1

已解决。

可以看

django form field validation and error display 和 django TemplateDoesNotExist

Answer 2

lz可以参考这篇文章，变通实现这个功能
http://muilpin.blog.163.com/blog/static/165382936201221910158809/
ajax提交到后台，通过获取form.name.errors来确定name字段是否错误

Answer 3

class SignupForm(forms.Form):

email = forms.EmailField(label=u"电子邮箱")
name = forms.CharField(label=u"姓名",max_length=50)
password = forms.CharField(label=u"密码", max_length=30, widget=forms.PasswordInput)
password2 = forms.CharField(label=u"确认密码", max_length=30, widget=forms.PasswordInput)

def clean(self):
    cleaned_data = super(SignupForm, self).clean()
    password = cleaned_data.get("password")
    password2 = cleaned_data.get("password2")
    if password != password2:
        raise forms.ValidationError(u"两次密码必须一致")

刚好也遇到了这样的问题，看了下官方的文档Cleaning and validating fields that depend on each other
希望我的回答能给以后遇到这样问题的同学提供帮助