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FormView – Class Based Views Django
  • Last Updated : 20 Jul, 2020

FormView refers to a view (logic) to display and verify a Django Form. For example a form to register users at geeksforgeeks. Class-based views provide an alternative way to implement views as Python objects instead of functions. They do not replace function-based views, but have certain differences and advantages when compared to function-based views:

  • Organization of code related to specific HTTP methods (GET, POST, etc.) can be addressed by separate methods instead of conditional branching.
  • Object oriented techniques such as mixins (multiple inheritance) can be used to factor code into reusable components.

Class based views are simpler and efficient to manage than function-based views. A function based view with tons of lines of code can be converted into a class based views with few lines only. This is where Object Oriented Programming comes into impact.

Django FormView – Class Based Views

Illustration of How to create and use FormView using an Example. Consider a project named geeksforgeeks having an app named geeks.

Refer to the following articles to check how to create a project and an app in Django.

After you have a project and an app, let’s create a form of which we will be creating FormView. In geeks/forms.py,






from django import forms
  
# creating a form
class GeeksForm(forms.Form):
    # specify fields for model
    title = forms.CharField()
    description = forms.CharField(widget = forms.Textarea)

After creating the form let’s create FormView. in geeks/views.py,




# import generic FormView
from django.views.generic.edit import FormView
  
# Relative import of GeeksForm
from .forms import GeeksForm
  
class GeeksFormView(FormView):
    # specify the Form you want to use
    form_class = GeeksForm
      
    # sepcify name of template
    template_name = "geeks / geeksmodel_form.html"
  
    # can specify success url
    # url to redirect after successfully
    # updating details
    success_url ="/thanks/"

Create a template for this view in geeks/geeksmodel_form.html,




<form method="post">
    {% csrf_token %}
    {{ form.as_p }}
    <input type="submit" value="Save">
</form>

Map a url to this view in geeks/urls.py,




from django.urls import path
  
# importing views from views..py
from .views import GeeksFormView
urlpatterns = [
    path('', GeeksFormView.as_view()),
]

Now visit http://127.0.0.1:8000/,
django-create-view-function-based

Validate Form Data in Form View

Class Based Views provide in built functions for validating data in form. In geeks/views.py,




# import generic FormView
from django.views.generic.edit import FormView
  
# Relative import of GeeksForm
from .forms import GeeksForm
  
class GeeksFormView(FormView):
    # specify the Form you want to use
    form_class = GeeksForm
      
    # sepcify name of template
    template_name = "geeks / geeksmodel_form.html"
  
    # can specify success url
    # url to redirect after successfully
    # updating details
    success_url ="/thanks/"
  
    def form_valid(self, form):
        # This method is called when valid form data has been POSTed.
        # It should return an HttpResponse.
          
        # perform a action here
        print(form.cleaned_data)
        return super().form_valid(form)

One can perform desired functionality in form_valid function. In our case, it prints the data. Lets’ try entering data in the form and check if it is working.
django-formview-class-based-view
Check in terminal if details have been printed.
django-formview-terminal

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