FormView - Class Based Views Django - GeeksforGeeks

20 Jul, 2021
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.  
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.  
How to Create a Basic Project using MVT in Django?
How to Create 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,  
Python3
from django import forms # creating a formclass 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,  
Python3
# import generic FormViewfrom django.views.generic.edit import FormView # Relative import of GeeksFormfrom .forms import GeeksForm class GeeksFormView(FormView):    # specify the Form you want to use    form_class = GeeksForm         # specify 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,  
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,  
Python3
from django.urls import path # importing views from views..pyfrom .views import GeeksFormViewurlpatterns = [    path('', GeeksFormView.as_view()),]
Now visit http://127.0.0.1:8000/,  
 
Class Based Views provide in built functions for validating data in form. In geeks/views.py,  
Python3
# import generic FormViewfrom django.views.generic.edit import FormView # Relative import of GeeksFormfrom .forms import GeeksForm class GeeksFormView(FormView):    # specify the Form you want to use    form_class = GeeksForm         # specify 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.  
Check in terminal if details have been printed.  
 
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