button in flask

from flask import Flask, render_template, request

app = Flask(__name__)

@app.route('/')
def index():
    return render_template('index.html')

@app.route('/submit', methods=['POST'])
def submit():
    if request.method == 'POST':
        button_value = request.form['button']
        if button_value == 'Click Me':
            message = "Button Clicked!"
        else:
            message = "Unknown Button"
        return message
    return 'Invalid request'

if __name__ == '__main__':
    app.run(debug=True)

Explanation:

1. Import necessary modules:
2. Flask: to create the web application.
3. render_template: to render HTML templates.

4. request: to handle HTTP requests.

5. Initialize the Flask application:

6. app = Flask(__name__): Create an instance of the Flask class.

7. Define the route for the root URL '/':

8. @app.route('/'): Decorator that binds the URL endpoint '/' to the index() function.

9. def index():: Define the index function to render the index.html template.

10. Define the route for form submission:

11. @app.route('/submit', methods=['POST']): Decorator that binds the URL endpoint '/submit' to the submit() function and specifies that it only accepts POST requests.

12. def submit():: Define the submit function to handle form submission.

13. Check the request method and retrieve form data:

14. if request.method == 'POST':: Check if the request method is POST.

15. button_value = request.form['button']: Get the value of the form field named 'button' from the submitted form.

16. Process the button value:

17. if button_value == 'Click Me':: Check the value of the button submitted.
18. message = "Button Clicked!": If the button value is 'Click Me', set message to "Button Clicked!".

19. else: message = "Unknown Button": If the button value is not 'Click Me', set message to "Unknown Button".

20. Return the response:

21. return message: Return the message based on the button clicked or an unknown button.

22. return 'Invalid request': If the request method is not POST, return an "Invalid request" message.

23. Run the Flask application:

24. if __name__ == '__main__':: Check if the script is executed directly.
25. app.run(debug=True): Start the Flask application in debug mode.