Question

当我尝试使用index.html中设置的用户名和密码登录时，错误显示如下：

ValueError at /login_action/
The view sign.views.login_action didn't return an HttpResponse object. It                       returned None instead.
Request Method: POST
Request URL:    http://127.0.0.1:8000/login_action/
Django Version: 1.11.1
Exception Type: ValueError
Exception Value:    
The view sign.views.login_action didn't return an HttpResponse object. It returned None instead.
Exception Location: D:\python3.6.1\lib\site-      packages\django\core\handlers\base.py in _get_response, line 198
Python Executable:  D:\python3.6.1\python.exe
Python Version: 3.6.1
Python Path:    
['C:\\Users\\Administrator\\guest',
'D:\\python3.6.1\\python36.zip',
'D:\\python3.6.1\\DLLs',
'D:\\python3.6.1\\lib',
'D:\\python3.6.1',
'D:\\python3.6.1\\lib\\site-packages']
 Server time:   Mon, 12 Jun 2017 08:29:35 +0000

从提示它说HttpResponse对象的valut是没有

urls.py如下

from django.conf.urls import url
from django.contrib import admin
from sign import views
urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'^index/$',views.index),
url(r'^login_action/$',views.login_action),
]

views.py如下

from django.shortcuts import render
from django.http import HttpResponse
# Create your views here.
def index(request):
return render(request,"index.html")
# 登录函数定义
def login_action(request):
 if request.method == 'post':
    username = request.POST.get('username','')
    password = request.POST.get('password','')
    if username == 'admin'and password == 'admin123':
        return HttpResponse( '恭喜您，登录成功!')
    else:
        return render(request,'index.html',{'error':'用户名或者登录密码错误!'})

index.html如下

<html>
<head>
    <title>欢迎登陆点米年会发布会系统</title>
</head>
<body>
<h1>年会签名系统登陆<br>
    WELCOM TO DIAN MI</h1>
<form method="post" action="/login_action/">
<input name="username" type="text" placeholder="用户名"><br>
<input name="password" type="password" placeholder="登录密码"><br>
    <button id="btn"  type="submit"> 登陆</button>
{{error}}<br>
</form>
</body>
</html>

the screenshot of the traceback of the error

Answer 1

尝试将测试字符串更改为大写。正如您在https://docs.djangoproject.com/en/1.11/ref/request-response/#django.http.HttpRequest.method中看到的那样，request.method的字符串不是小写的。

Answer 2

<强>更好使用大写字母表示方法名称：

如果request.method =='POST'：
好多了 使用基于类的视图：

类LoginAction（View）： def post（self，request）：
你的代码

Answer 3

将request.method大写，例如，

if request.method == 'POST':

Answer 4

第request.method == 'post'行上的“POST”检查需要在views.py文件中为大写。

ValueError：（Django1.11.1 python3.6.1 pycharm）

4 个答案: