How to by default not show list of items? - django

Question

There is a page where the list of elements is displayed. Also on this page there is a search by value. When I enter a value, the page only displays elements with that value.
I need to make the page show nothing but the search by default. And only after the query, the page shows the elements with the entered value. How to do it?
home.html
<div class="headtext">
<form method="GET" action="{% url 'search' %}">
<input type="search" type="text" name="q" prequired placeholder="Put appnumber">
<button type="submit">Find</button>
</form>
</div>
<div>
{% for application in object_list %}
<div>
<p>Application: {{ application.appnumber }}, status: {{ application.status }}</p>
</div>
{% endfor %}
</div>
urls.py
from django.urls import path
from .views import HomeView, Search
urlpatterns = [
path('', HomeView.as_view(), name="home"),
path('search/', Search.as_view(), name="search"),
views.py
class HomeView(ListView):
model = Application
template_name = 'home.html'
class Search(ListView):
template_name = 'home.html'
def get_queryset(self):
return Application.objects.filter(appnumber__icontains=self.request.GET.get("q"))
def get_context_data(self, *args, **kwargs):
context = super().get_context_data(*args, **kwargs)
context["q"] = self.request.GET.get("q")
return context

Answer 1

Simply check the existence of the object_list context variable:
<div class="headtext">
<form method="GET" action="{% url 'search' %}">
<input type="search" type="text" name="q" prequired placeholder="Put appnumber">
<button type="submit">Find</button>
</form>
</div>
{% if object_list %}
<div>
{% for application in object_list %}
<div>
<p>Application: {{ application.appnumber }}, status: {{ application.status }}</p>
</div>
{% endfor %}
</div>
{% endif %}
Edit: I hadn't noticed that HomeView is also a subclass of ListView. Change it to:
class HomeView(TemplateView):
template_name = 'home.html'

Answer 2

You can have an method that will take 'q' from request and return it or None.
Then your get_queryset can use this parameter to return object list you need.
Something like this should work
class Search(ListView):
template_name = 'home.html'
def get_q(self):
q = self.request.GET.get('q', None)
return q
def get_queryset(self):
q = self.get_q()
if not q:
return []
return Application.objects.filter(appnumber__icontains=q)