In this tutorial, we will be discussing how to handle forms, POST requests, and file handling in Flask. Forms are an essential component in web development as they allow users to input data that can be submitted to the server. We will be using Flask, a lightweight web framework, to build our application.
Let’s start by creating a new Flask application. Make sure you have Flask installed on your system. You can install it by running pip install Flask in your terminal. Once you have Flask installed, create a new file called app.py and add the following code:
from flask import Flask, render_template, request
app = Flask(__name__)
@app.route('/')
def index():
return render_template('index.html')
if __name__ == '__main__':
app.run(debug=True)In this code, we have created a basic Flask application with a single route that renders a template called index.html. Now let’s create the index.html template. Create a new folder called templates in the same directory as your app.py file, and inside the templates folder, create a new file called index.html with the following code:
<!DOCTYPE html>
<html>
<head>
<title>Flask Form</title>
</head>
<body>
<h1>Flask Form Example</h1>
<form method="post" enctype="multipart/form-data">
<input type="text" name="username" placeholder="Enter your username"><br><br>
<input type="file" name="file"><br><br>
<button type="submit">Submit</button>
</form>
</body>
</html>In this template, we have created a simple form with an input field for the username and a file input field. The form is set to use the POST method and enctype multipart/form-data which is required for file uploads.
Now let’s update our app.py file to handle the form submission. Add the following code to your app.py file:
@app.route('/', methods=['GET', 'POST'])
def index():
if request.method == 'POST':
username = request.form['username']
file = request.files['file']
if file:
file.save(file.filename)
return f'File uploaded successfully. Username: {username}'
return render_template('index.html')In this code, we have updated the index route to handle both GET and POST requests. When a POST request is made, we retrieve the username from the form data and the file from the file input field. We save the file to the current directory with the filename as provided by the user and return a success message with the username.
Now when you run your Flask application and access it in your browser, you should see the form that allows you to enter a username and upload a file. When you submit the form, the file will be saved in the current directory with the filename provided by the user.
That’s it for this tutorial on handling forms, POST requests, and file uploads in Flask. I hope you found this tutorial helpful! Feel free to explore more advanced form handling techniques and customization options in Flask. Happy coding!
advanced series pls
Thank you very much. your gave a lot of information from one video
ValueError: source code string cannot contain null bytes
Perhaps, we can write multiple in the input tag so that the site accepts multiple formats, also, required is a built-in thing in html, and doesn't need to be defined.
Btw, SOLID playlist, THANK YOU SO MUCH, Neural Nine!!
I like your voice, your character, your everything
"I hate javascript"
I love being part of the python gang, not gonna lie
It says one positional aergument is missing 'path'
Much appreciated
nice
Very good
Thanks for the great video. Appreciate if you could also include how to draw data science data visualisation plots and graphs in frontend using flask with any of these matplotlib/plotly/seaborn or any of your favourite library. thanks in advance
Thanks man, I really appreciate the effort you are putting in this series!
Super video, thank you!
thank you also definitely we need more
need separate video for javascript ЁЯШВ
nice ЁЯдЭЁЯП╗
Appreciate you N9, keep it up