Question

我试图让表单从用户那里获取信息并使用此信息发送电子邮件。这是我的代码：

#forms.py
from django import forms

class ContactForm(forms.Form):
    nome = forms.CharField(required=True)
    email = forms.EmailField(required=True)
    msg = forms.CharField(
        required=True,
        widget=forms.Textarea
    )

#views.py
from django.shortcuts import render, redirect, get_object_or_404, HttpResponseRedirect, render_to_response
from django.core.mail import send_mail
from .forms import ContactForm

def contato(request):
    form_class = ContactForm
    if request.method == 'POST':
        form = form_class(request.POST)
        if form.is_valid():
            nome = request.POST.get('nome')
            email = request.POST.get('email')
            msg = request.POST.get('msg')

            send_mail('Subject here', msg, email, ['testmail@gmail.com'], fail_silently=False)
            return HttpResponseRedirect('blog/inicio')
    return render(request, 'blog/inicio.html', {'form': form})


#contato.html
{% extends "blog/base.html" %}
{% block content %}

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

当我尝试进入联系页面时，我收到此错误：

local variable 'form' referenced before assignment

它说错误出现在这行views.py中：

return render(request, 'blog/inicio.html', {'form': form})

我在Django上有点新鲜，你能帮助我吗？

Answer 1

您在此form块中定义if request.method == 'POST':变量。如果您使用GET请求访问view form未定义。您应该将视图更改为以下内容：

def contato(request):
    form_class = ContactForm
    # if request is not post, initialize an empty form
    form = form_class(request.POST or None)
    if request.method == 'POST':

        if form.is_valid():
            nome = request.POST.get('nome')
            email = request.POST.get('email')
            msg = request.POST.get('msg')

            send_mail('Subject here', msg, email, ['testmail@gmail.com'], fail_silently=False)
            return HttpResponseRedirect('blog/inicio')
    return render(request, 'blog/inicio.html', {'form': form})

Answer 2

如果可以通过初始化一个空的“形式”来说 - “附带损害”，那么你也可以提供一个“虚拟”值作为填充，直到“request.POST”被初始化...... / p>

{{1}}

Answer 3

Django文档处理此问题，但与其他答案稍有不同。参见https://docs.djangoproject.com/en/dev/topics/forms/#using-a-form-in-a-view

使用else，如果请求不是POST，则创建空白表格。以下内容直接从文档中粘贴。

def get_name(request):
    # if this is a POST request we need to process the form data
    if request.method == 'POST':
        # create a form instance and populate it with data from the request:
        form = NameForm(request.POST)
        # check whether it's valid:
        if form.is_valid():
            # process the data in form.cleaned_data as required
            # ...
            # redirect to a new URL:
            return HttpResponseRedirect('/thanks/')

    # if a GET (or any other method) we'll create a blank form
    else:
        form = NameForm()

    return render(request, 'name.html', {'form': form})

Answer 4

唯一的问题是您没有将ContactForm声明为函数，从此改变；

def contato（请求）： form_class = ContactForm 如果request.method =='POST'：

TO; def contato（请求）： form_class = ContactForm（）如果request.method =='POST'：

DJANGO - 本地变量＆＃39;形式＆＃39;在分配之前引用

4 个答案: