django use html selected as if/else selection in views - ajax

Question

thanks in advance
I'm new to web development and I'm task to do this Django project.
I had Selection the user will select one and tells the views which chose to use (if & else if)
then the view Query the data from DB and will return to HTML
I try using this following this answer: Django - How to do an if statement if button is clicked
but run into this error:
Environment:
Request Method: GET
Request URL: http://127.0.0.1:8000/ph-data/
Django Version: 2.1.3
Python Version: 3.7.1
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'rest_framework',
'zigview']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']
Traceback:
File "C:\Users\user\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\handlers\exception.py" in inner
34. response = get_response(request)
File "C:\Users\user\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\handlers\base.py" in _get_response
126. response = self.process_exception_by_middleware(e, request)
File "C:\Users\user\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\core\handlers\base.py" in _get_response
124. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\user\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\contrib\auth\decorators.py" in _wrapped_view
21. return view_func(request, *args, **kwargs)
File "C:\Users\user\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\views\generic\base.py" in view
68. return self.dispatch(request, *args, **kwargs)
File "C:\Users\user\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\views\generic\base.py" in dispatch
88. return handler(request, *args, **kwargs)
File "C:\Users\user\AppData\Local\Programs\Python\Python37-32\lib\site-packages\django\views\generic\list.py" in get
157. context = self.get_context_data()
File "C:\Users\user\Desktop\Frouniter\FrounterWeb- postgreDB\zigview\views.py" in get_context_data
46. if request.GET.get('Week') == 'Week':
Exception Type: NameError at /ph-data/
Exception Value: name 'request' is not defined
I move to seconds solution which is to use ajax, but the more Look at ajax the more lost i'm am.
Here my views codes:
try:
class index(ListView):
model = tank_system
template_name = 'FrounterWeb/extends/includes.html'
ordering = ['-datetime']
def get_context_data(self,**kwargs):
return{'tank':self.get_queryset()}
#def get_queryset(self):
# return
except:
logger.error('index page request failed/errors')
try:
class ph(ListView):
model = tank_system
template_name = 'FrounterWeb/extends/ph.html'
context_object_name = tank_system
ordering = ['-datetime'] # sort dates in descending order
def get_context_data(self, **kwargs):
###################### Days filter #################################
today_date = datetime.now().day#call today datas
yesterday_date = datetime.now().day - 1
###################### end of Days filter ###########################
############################# Weeks Filter ######################
# last week math caluactions
some_day_last_week = timezone.now().date() - timedelta(days=7)
monday_of_last_week = some_day_last_week - timedelta(days=(some_day_last_week.isocalendar()[2] - 1))
monday_of_this_week = monday_of_last_week + timedelta(days=7)
# last week math caluactions
#this week data
monday_of_next_week = monday_of_this_week + timedelta(days=7)
Thisweekdata = {'tank': self.get_queryset().filter(datetime__gte=monday_of_this_week, datetime__lt=monday_of_next_week)}
############################# Weeks Filter ######################
###################### Months filter ###########################
currentMonth = datetime.now().month #take this months
pastMonth = currentMonth - 1
###################### end of Months filter ###########################
###################### Year filter ###########################
currentYear = datetime.now().year
lastYear = currentYear - 1
###################### end of Year filter ###########################
#if case
return {'tank': self.get_queryset()}
except:
logger.error('PH page Functions failed/errors')
try:
class EC(ListView):
model = tank_system
template_name = 'FrounterWeb/extends/EC.html'
ordering = ['-datetime'] # sort dates in descending order
def get_context_data(self, **kwargs):
return {'tank': self.get_queryset()}
except:
logger.error('EC page Functions failed/errors')
Questions Summary:
Need to send get the request to back end
The request got to back end and it will see which data should go out
return the selected/filter data (week, day etc)
Here a picture for better understanding:
I'm Sorry to ask something this simple, and thank you