Jinja Tricks

Examples

Jinja Form Template

Rendering a Form Template

Jinja form template displays Flask-WTF form with validation.

Introduction to Jinja Form Templates

Jinja is a templating engine for Python that is often used with the Flask web framework to create dynamic web applications. When working with forms in Flask, the Flask-WTF extension is commonly used to facilitate form handling, validation, and rendering. In this guide, we'll cover how to display a Flask-WTF form in a Jinja template and handle form validation effectively.

Setting Up Flask-WTF

Before we can create and display forms using Jinja, we need to set up Flask-WTF. If you haven't installed it yet, you can do so using pip:

Next, configure the Flask app to use Flask-WTF by setting a secret key and enabling CSRF protection:

Creating a Flask-WTF Form

Let's create a simple form using Flask-WTF. This form will have a single text field and a submit button:

Rendering the Form in a Jinja Template

Now that we have our form set up, we can render it within a Jinja template. Create a new HTML file, form.html, and add the following content:

Handling Form Submission and Validation

To handle form submissions and validate the data, you need to create a route in your Flask application. This will process the form data and provide feedback to the user:

Conclusion

In this tutorial, we covered how to set up Flask-WTF to create and validate forms, and how to render these forms using Jinja templates in a Flask application. By following these steps, you can effectively handle form data and provide a seamless user experience in your web applications.

Examples

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