在登录表单中显示错误

Question

我创建了一个用户登录页面，它工作的很棒！但是当用户输入错误的凭证时，如何在登录页面上显示错误？我尝试了一个if和一个变量，但是不管怎么样都导致了错误的显示。

在我的意见，我已经设置了“ERROR_MESSAGE”变量，像这样：

def LoginView(request): 
    error_message = '' 
    logout(request) 
    context = RequestContext(request) 
    username = request.POST.get('username') 
    password = request.POST.get('password') 
    user = authenticate(username=username, password=password) 
    if user is not None: 
     if user.is_active: 
      login(request, user) 
      return HttpResponseRedirect("/") 
     else: 
      # Return a 'disabled account' error message 
      return HttpResponseRedirect("/") 
    else: 
     # Return an 'invalid login' error message 
    ---> error_message = "Incorrect username or password." 
    return render(request, 'profile/login.html', {'error_message': error_message}, context) 

然而，在我的模板，这个变量将显示不管是什么，即使我设置里面的变量“如果“声明。

这里是我的模板：

{% include '__header.html' %} 
<style> 
main { 
    width: 920px; 
    background: none; 
    margin-top: calc(50vh - 280px) 
} 
</style> 

<div class="form-container"> 
<form id="user" method="post" action="/login/" 
enctype="multipart/form-data" class="text"> 
    {% csrf_token %} 
    <div class="title">Login to your account</div> 
    <div class="form-col"> 
     <div class="field-container"> 
      <div class="field-input-container"> 
       <div class="field-label">Username</div> 
       <div class="field-input"> 
        <input class="field-input-element" type="text" name="username"/> 
       </div> 
      </div> 
     <div class="field-help"></div> 
     </div> 
    </div> 
    <div class="form-col"> 
     <div class="field-container" style="height: 110px"> 
      <div class="field-input-container"> 
       <div class="field-label">Password</div> 
       <div class="field-input"> 
       <input class="field-input-element" type="password" name="password"/> 
       </div> 
      </div> 
     <div class="field-error">{{ error_message }}</div> 
     <div class="field-help"></div> 
     </div> 
    </div> 
    <div class="form-button-container"> 
    <input type="submit" name="submit" value="Login" class="button form-button"/> 
    </div> 
</form> 
</div> 

{% include '__footer.html' %} 

那么，怎样才能在我只有在出现了一个错误的模板显示错误信息？基于

---

更新代码关闭答案（仍然没有同样的事情）

def LoginView(request): 
    template_name='profile/login.html' 
    logout(request) 
    context = RequestContext(request) 

    if request.method == 'POST': 
     username = request.POST.get('username') 
     password = request.POST.get('password') 
     user = authenticate(username=username, password=password) 
     if user is not None: 
      if user.is_active: 
       login(request, user) 
       return HttpResponseRedirect("/") 
      else: 
       # Return a 'disabled account' error message 
       return HttpResponseRedirect("/") 
     else: 
      # Return an 'invalid login' error message 
      error_message = "Incorrect username or password." 
    else: 
     error_message = '' 

    return render(request, 'profile/login.html', {'error_message': error_message}, context) 

Answer 1

，你必须检查他们是否已经张贴的形式，所以你可以在if request.method == 'POST'

if request.method == 'POST': 
    username = request.POST.get('username') 
    password = request.POST.get('password') 
    user = authenticate(username=username, password=password) 
    if user is not None: 
     if user.is_active: 
      login(request, user) 
      return HttpResponseRedirect("/") 
     else: 
      # Return a 'disabled account' error message 
      return HttpResponseRedirect("/") 
    else: 
     # Return an 'invalid login' error message 
     error_message = "Incorrect username or password." 

您可能还需要包装包装这部分细节只应用户的逻辑在

{% if error_message %} 

Answer 2

立即解决问题是你设置你的错误消息GET和POST请求。用户提交数据后，您应该只显示POST请求。

if request.method == "POST": 
    username = request.POST.get('username') 
    password = request.POST.get('password') 
    user = authenticate(username=username, password=password) 
    if user is not None: 
     ... 
    else: 
     # Return an 'invalid login' error message 
     error_message = "Incorrect username or password." 

Answer 3

这里你的错误的div可能是你，第一进口和您的视图内声明的模板名称有用的例子：

from django.contrib import messages 

template_name='your_app/login.html' #Inside the login view 

接着，在登录失败：

messages.error(request, "incorrect user or password") 

而在去年，呈现模板：

return render(request, self.template_name,{"form_group" : form_group}) 

希望它能帮助。