Django Form Init检查字段是否存在将CSS类应用于该字段的错误

我现在遇到了一个我无法解决的问题

我给自己写了一个简单的表单来更新用户的密码。在构造函数中，如果有错误，我想在输入字段中添加一个特定的类。基本上，这是在POST请求之后以及我验证表单之后发生的

班级：

class UpdatePasswordForm(forms.Form):
    """
    This form is used at two places:
        - A user has been logged out and needs to reset the password
        - A user is in the control panel and wants to update the password
    """

    user = None
    def_error_messages = {
        'current_password_not_correct': _("Derzeitiges Passwort nicht ok."),
        'password_mismatch': _("The two password fields didn't match."),
        'password_tooshort': _("The password is too short."),
        'password_tooeasy': _("The password is too easy or based on dictionary word."),
    }

    PASS_MIN_LENGTH = 8

    current_password = forms.CharField(label=_("Derzeitiges Passwort"), widget=forms.PasswordInput)
    password1 = forms.CharField(label=_("Password"),
                                widget=forms.PasswordInput)
    password2 = forms.CharField(label=_("Password confirmation"),
                                widget=forms.PasswordInput,
                                help_text=_("Enter the same password as above, for verification."))

    def __init__(self, *args, **kwargs):
        super(UpdatePasswordForm, self).__init__(*args, **kwargs)
        for f in self.fields:
            if self.fields[f].error_messages is not None:
                logger.debug(self.fields[f].error_messages)
                self.fields[f].widget.attrs['class'] = 'invalid'

    def clean_current_password(self):
        current_password = self.cleaned_data.get('current_password')
        if current_password and self.user:
            if check_password(current_password, self.user.password):
                return True

            raise forms.ValidationError(
                self.def_error_messages['current_password_not_correct'],
                code='current_password_not_correct',
            )
        return False

    def has_digits(self, val):
        digits = False
        if any(c.isdigit() for c in val):
            digits = True
        return digits

    def has_alpha(self, val):
        ascii = False
        if any(c in string.ascii_letters for c in val):
            ascii = True
        return ascii

    def clean_password1(self):
        password1 = self.cleaned_data.get("password1")
        if len(password1) < self.PASS_MIN_LENGTH:
            raise forms.ValidationError(
                self.def_error_messages['password_tooshort'],
                code='password_tooshort',
            )

        # check if it contains numbers
        digits = self.has_digits(password1)
        # check for normal char
        ascii = self.has_alpha(password1)

        if not digits and not ascii:
            raise forms.ValidationError(
                self.def_error_messages['password_tooeasy'],
                code='password_tooeasy',
            )

        return password1

    def clean_password2(self):
        password1 = self.cleaned_data.get("password1")
        password2 = self.cleaned_data.get("password2")
        if password1 and password2 and password1 != password2:
            raise forms.ValidationError(
                self.def_error_messages['password_mismatch'],
                code='password_mismatch',
            )
        return password2

    def save(self, commit=True):
        customer = self.user
        customer.set_password(self.cleaned_data["password1"])
        customer.passwordreset = False
        customer.resetdatetime = timezone.now()
        customer.resetunifier = ""
        if commit:
            customer.save()
        return customer

在我的控制台中显示：

[Fri Oct 23 04:08:30.837138 2015] [wsgi:error] [pid 49999] [23/Oct/2015 04:08:30] DEBUG [syslog:968] {u'required': <django.utils.functional.__proxy__ object at 0x7fd39242bbd0>}
[Fri Oct 23 04:08:30.837351 2015] [wsgi:error] [pid 49999] [23/Oct/2015 04:08:30] DEBUG [syslog:968] {u'required': <django.utils.functional.__proxy__ object at 0x7fd39242bbd0>}
[Fri Oct 23 04:08:30.837561 2015] [wsgi:error] [pid 49999] [23/Oct/2015 04:08:30] DEBUG [syslog:968] {u'required': <django.utils.functional.__proxy__ object at 0x7fd39242bbd0>}

[Fri-Oct 23 04:08:30.837138 2015][wsgi:error][pid 49999][23/Oct/2015 04:08:30]调试[syslog:968]{u'required'：}
[Fri Oct 23 04:08:30.837351 2015][wsgi:error][pid 49999][23/Oct/2015 04:08:30]调试[syslog:968]{u'required'：}
[Fri Oct 23 04:08:30.837561 2015][wsgi:error][pid 49999][23/Oct/2015 04:08:30]调试[syslog:968]{u'required'：}

这很有趣，因为我只要求页面，但没有提交表格！所需资源来自哪里？很明显，它没有填写。因为我的网站上没有显示错误消息

我的模板如下所示：

<div class="input-field">
    <label>{{ password_form.current_password.label }}</label>
    {{ password_form.current_password }}
    {% for error in password_form.current_password.errors %}
        <span class="help-block">{{ error }}</span>
    {% endfor %}
</div>

{{password\u form.current\u password.label}
{{password\u form.current\u password}}
{%用于密码形式中的错误。当前密码。错误%}
{{error}}
{%endfor%}

您应该将代码添加到

is\u valid（）

方法中，而不是

\u init\u（）

方法中，因为在初始化过程中不会进行验证

 class UpdatePasswordForm(forms.Form):
     ...
     def is_valid(self):
         is_valid = super(UpdatePasswordForm, self).is_valid()
         for f in self.fields:
             if self.fields[f].error_messages is not None:
                 logger.debug(self.fields[f].error_messages)
                 self.fields[f].widget.attrs['class'] = 'invalid'
         return is_valid

---

我认为在

\uuuu init\uuuu（）

方法中添加该代码是无法做到这一点的，因为在初始化过程中不会进行任何验证。相反，我将尝试在

is\u valid（）

方法中添加代码。@RodXavier如果您将其作为答案，我将接受它。这就解决了问题！

 class UpdatePasswordForm(forms.Form):
     ...
     def is_valid(self):
         is_valid = super(UpdatePasswordForm, self).is_valid()
         for f in self.fields:
             if self.fields[f].error_messages is not None:
                 logger.debug(self.fields[f].error_messages)
                 self.fields[f].widget.attrs['class'] = 'invalid'
         return is_valid