? Function-Based Views (FBVs)

? Quick Overview

In Django, a view is a function that receives a web request and returns a web response. Function-based views (FBVs) are the most straightforward type of view, where a Python function is mapped to a URL pattern and is responsible for returning an HTTP response.

? Key Concepts

• Views handle HTTP requests and responses
• FBVs are plain Python functions
• Easy to read, test, and debug

? Syntax / Theory

# Import HttpResponse class
from django.http import HttpResponse
def my_view(request):
    # Return simple HTTP response
    return HttpResponse("Hello, World!")

? Adding FBV to URLs

# URL configuration file
from django.urls import path
from . import views
urlpatterns = [
    # Map URL to view function
    path('hello/', views.my_view, name='hello'),
]

? Returning Different Responses

# Render HTML template
from django.shortcuts import render
def home_view(request):
    return render(request, 'home.html', {'greeting': 'Hello, World!'})

# Return JSON response
from django.http import JsonResponse
def api_view(request):
    data = {'message': 'Hello, World!'}
    return JsonResponse(data)

? Explanation

• FBVs are simple Python functions
• Mapped using path() in urls.py
• Support multiple response types

? Interactive Example

Change the message inside HttpResponse() and refresh the browser to see instant updates.

? Use Cases

• Simple pages
• API endpoints
• Form handling