Django request.POST.get() returns None

Question

I face a problem and I can't find a solution.

I'm trying to redirect to the previous page after login. Somehow the ?next=request.path returns none when trying to request.POST.get() after submission.

This is my Html code that directs the user to the login page, taking the request.path as "next page after login" value.

{% if user.is_authenticated %}
    <button class="btn" data-toggle="modal" data-target="#inquiryModal">
      <a class="btn btn-primary border rounded-0" 
         role="button" href="#">Make an Inquiry</a>
    </button>
{% else %}
     <a class="btn btn-primary border rounded-0" role="button" 
        href="{% url 'login' %}?next={{ request.path|urlencode }}"
                        >Make An Inquiry</a>
{% endif %}

This is the login page html code.

<div class="login-clean" style="background-color: #fff;">
    <form action="{% url 'login' %}" method="POST">
        {% csrf_token %}

        <!--- ALERTS -->
        {% include 'partials/_alerts.html' %}

        <div class="form-group">
             <input class="form-control" type="email" name="email" placeholder="Email"></div>
        <div class="form-group">
             <input class="form-control" type="password" name="password" placeholder="Password">
        </div>
        <div class="form-group">
             <button class="btn btn-primary btn-block" type="submit">Log In</button>
        </div>
     </form>
</div>

Views.py file

def login(request):
    if request.method == 'POST':
        email = request.POST['email']
        password = request.POST['password']
        valuenext = request.POST.get('next')


        print(valuenext)

        user = auth.authenticate(username=email, password=password)

        # if user is found and not from listing page login and redirect to dashboard
        if user is not None and valuenext == "":
            auth.login(request, user)
            messages.success(request, 'You are now succesfully logged in')
            return redirect('dash_inquiries')

        # if user is found and from specific listing page login and redirect to the listing
        elif user is not None and valuenext != "":
            auth.login(request, user)
            print("success")
            messages.success(request, 'You are now logged in')
            return redirect(valuenext)

        else: 
            messages.error(request, 'Invalid credentials')
            return redirect('login')

    else:
        return render(request, 'accounts/login.html')

What am I doing wrong here? The next value is passed in the url when directing to the login page, but I don't seem to correctly get() the next value in my backend as it keeps returning None.

Thanks in advance.

`?next=something` is query parameter. To access query parameter you can use `request.GET.get('next')`. This should work. — k33da_the_bug, Apr 25 '20 at 12:27

score 0 · Answer 1 · answered Apr 25 '20 at 12:29

Clicking on following button will send a GET request.

<a class="btn btn-primary border rounded-0" role="button" 
    href="{% url 'login' %}?next={{ request.path|urlencode }}">Make An Inquiry</a>

This get request will render accounts/login.html template.

You're parsing request.POST.get('next') for POST requests only. But there is no next in

<form action="{% url 'login' %}" method="POST">

You need your form tag to look like

<form action="{% url 'login' %}next={{ next }}" method="POST">

To solve above issue, you need to parse 'next' for request.GET, and add it to context for response.

if request.method == 'POST':
    # handle POST
else:
    next = request.GET.get('next', '')
    context = {'next': next}
    return render(request, 'accounts/login.html', context=context)

And then, add this next into form.action.

<form action="{% url 'login' %}next={{ next }}" method="POST">

score 0 · Accepted Answer · answered Apr 25 '20 at 13:18

0

Okay, so I didn't make sure I passed the next value into the login form, therefore the solution was to add a hidden input to get the next value in the request:

<input type="hidden" name="next" value="{{ request.GET.next }}" />

answered Apr 25 '20 at 13:18

Nordin Sami

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Django request.POST.get() returns None

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