Django - Using context_processor

Question

I want to put a login form everywhere in my webpage so I added a context_processor and I included it in base.html file. The problem now is I cannot see the form.

Here is my context_processors.py:

def global_login_form(request):
    if request.method == 'POST':
        formLogin = LoginForm(data=request.POST)
        if formLogin.is_valid():
            from django.contrib.auth import login
            login(request, formLogin.get_user())
            ...
    else:
        formLogin = LoginForm()

    return {'formLogin': formLogin}

And here are the diferents htmls I tried in base.html trying to invoke the form:

<form action="/myapp/login/" method="post">
{% csrf_token %}
{{global_login_form}}
</form>

<form action="/myapp/login/" method="post">
{% csrf_token %}
{{global_login_form.as_p}}
</form>

<form action="/myapp/login/" method="post">
{% csrf_token %}
{{request.formLogin}}
</form>

first time I load the page, the context_process returns {'formLogin': formLogin} (cause formLogin is LoginForm()) but I cannot see the form while inspecting the html. It is not there... but I can see the csrf_token so I think I'm not invoking the context properly.

Just it case (maybe the order is incorrect), here is settings.py:

TEMPLATE_CONTEXT_PROCESSORS = (
    "myapp.context_processors.global_login_form",
    "django.core.context_processors.request",
    "django.contrib.auth.context_processors.auth",
)

Any ideas?

Answer 1

I believe OP has incorrectly assumed that the template context variable is going to match the function name of the context processor.

OP's context processor global_login_form() injects formLogin to the template context. Therefore, in the templates the form should be referenced as, for example, {{ formLogin.as_p }}.

Answer 2

you must have the form variable in every views, or you should implement a templatetag instead. example:

https://docs.djangoproject.com/en/dev/howto/custom-template-tags/#writing-custom-template-tags

from django import template
from django.contrib.auth.forms import AuthenticationForm

register = template.Library()

@register.inclusion_tag('registration/login.html', takes_context=True)
def login(context):
    """
    the login form 
    {% load login %}{% login %}
    """
    request = context.get('request', None)
    if not request:
        return 
    if request.user.is_authenticated():
        return dict(formLogin=AuthenticationForm())
    return dict(user=request.user)