How can I use Flask-WTF for advanced forms in my Flask application?

How can I use Flask-WTF for advanced forms in my Flask application?

Flask-WTF is an extension that integrates Flask with WTForms. It simplifies form handling in Flask apps. What specific features are you interested in?

I want to implement file uploads and custom validators.

You can use the FileField for file uploads and create custom validators by subclassing validators.BaseValidator. Would you like a code example?

Yes, please provide a code example for file uploads.

Here's a simple example:

from flask import Flask, render_template, request
from flask_wtf import FlaskForm
from wtforms import FileField, SubmitField
from wtforms.validators import DataRequired

class UploadForm(FlaskForm):
    file = FileField('File', validators=[DataRequired()])
    submit = SubmitField('Upload')

@app.route('/upload', methods=['GET', 'POST'])
def upload():
    form = UploadForm()
    if form.validate_on_submit():
        # handle file upload
        return 'File uploaded!'
    return render_template('upload.html', form=form)

This sets up a basic file upload form.

That looks great! How do I handle the uploaded file?

You can access the uploaded file using form.file.data. You can then save it to your desired location. Would you like to know more about file handling?