Flask form submission without Page Reload

Online apps are growing more and more common and are now a necessary part of our daily life. Form submission is one of the essential components of online applications. The standard procedure when completing a form on a web page is to click the submit button, which delivers the information to the server for processing and yet, consumers may see this as sluggish and difficult. This blog article will examine how to quickly and effectively submit forms in Flask without having to reload the page, improving user experience.

Installation and Syntax

Before we delve into the details of how to perform form submission without page reload in Flask, let's take a look at the syntax for creating a basic Flask application:

from flask import Flask

app = Flask(__name__)

@app.route('/')
def home():
   return 'Hello, World!'

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

This creates a basic Flask application with a single route that returns "Hello, World!" as the response. To run the application, simply run the script and navigate to http://localhost:5000/ in your web browser.

Algorithm

  • Create a form in HTML with appropriate input fields and a submit button.

  • Use jQuery to handle the form submission event and prevent the default form submission behavior.

  • Use jQuery to make an AJAX request to the Flask server with the form data.

  • Use Flask to process the form data and return a response.

  • Use jQuery to handle the response and update the page accordingly.

Example

Create a fresh Flask project first, then Launch your terminal to create a new directory for the project. Navigate to the directory and include a fresh Python file called app.py.

mkdir flask-form
cd flask-form
touch app.py

app.py

from flask import Flask, render_template, request

app = Flask(__name__)

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


@app.route('/submit', methods=['POST'])
def submit():
   name = request.form['name']
   email = request.form['email']
   message = request.form['message']

   return 'Form submitted!'

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

index.html

<!DOCTYPE html>
<html>
<head>
   <title>Flask Form Submission without Page Reload</title>
   <script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
   <script>
      $(document).ready(function() {
         $('form').submit(function(event) {
            event.preventDefault();
            $.ajax({
               type: 'POST',
               url: '/submit',
               data: $('form').serialize(),
               success: function() {
                  $('#name').val('');
                  $('#email').val('');
                  $('#message').val('');
                  alert('Form submitted!');
               }
            });
         });
      });
   </script>
</head>
<body>
   <form>
      <label for="name">Name:</label>
      <input type="text" id="name" name="name">
      <br>
      <label for="email">Email:</label>
      <input type="email" id="email" name="email">
      <br>
      <label for="message">Message:</label>
      <textarea id="message" name="message"></textarea>
      <br>
      <button type="submit">Submit</button>
   </form>
</body>
</html>

Output

Applications

User experience creation: Flask enables developers to construct online applications that seem more like native desktop or mobile apps, where user input is handled instantaneously and without any lag or delay which is possible by enabling form submissions without requiring page reloads. reducing server load.

Conventional form submissions call for a page reload, which can tax servers' resources and impede user experience. The amount of data that has to be transmitted back and forth between the client and server may be decreased by utilizing Flask to submit forms without reloading the page, resulting in a more lightweight and effective application.

Real-time updates are made easier by Flask's form submission features, which allow programmers to build apps that can change instantly without requiring page refreshes. This might be helpful for applications where users want to view the most recent information as soon as it becomes available, such as chat rooms or social media feeds.

Conclusion

The power of Flask's ability to submit forms without reloading the page may significantly enhance the user experience of online apps. This functionality offers a wide range of applications across many various sectors and use cases by enabling developers to build fluid and seamless user experiences, lessen server load, and permit real-time changes. Flask is a fantastic option for anybody wishing to develop high-quality, contemporary web apps because of its simplicity and versatility.

Updated on: 18-Jul-2023

2K+ Views

Related Articles

Kickstart Your Career

Get certified by completing the course

Get Started
Advertisements