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Could not load tags. Latest commit. Git stats 16 commits. Failed to load latest commit information. View code. Sample Flask App Problem Write a sample backend application for an online marketplace. To avoid this inconvenience, enable debug support.

The server will then reload itself if the code changes. It will also provide a useful debugger to track the errors if any, in the application. The user can access the information stored in the session, but cannot modify it unless they have the secret key, so you must never allow anyone to access your secret key. See the Flask documentation for sessions for more information. Add it directly following the app definition before defining the index view function:. Add this new function at the bottom of the file:.

GET requests are accepted by default. To create the template, open a file called create. Most of this code is standard HTML. It will display an input box for the post title, a text area for the post content, and a button to submit the form. For example, if you write a long post and you forget to give it a title, a message will be displayed informing you that the title is required. This will happen without losing the post you wrote since it will be stored in the request global object that you have access to in your templates.

This form submits a POST request to your create view function. However, there is no code to handle a POST request in the function yet, so nothing happens after filling in the form and submitting it. You can separately handle the POST request by checking the value of request. In the if statement you ensure that the code following it is only executed when the request is a POST request via the comparison request.

You then extract the submitted title and content from the request. If the title is not provided, the condition if not title would be fulfilled, displaying a message to the user informing them that the title is required. You then commit the changes to the database and close the connection.

Fill in the form with a title of your choice and some content. Once you submit the form, you will see the new post listed on the index page. Open the template file:. Then add a new for loop directly above the content block to display the flashed messages below the navigation bar. Save and close the file. This section will guide you through creating a new page in your application to simplify the process of editing a post. Open the app. Next, add the following edit view function at the end of the file.

Editing an existing post is similar to creating a new one, so this view function will be similar to the create view function:. The post you edit is determined by the URL and Flask will pass the ID number to the edit function via the id argument.

The new data will come in a POST request, which is handled inside the if request. Just like when you create a new post, you first extract the data from the request. Then you update the posts table by setting a new title and new content where the ID of the post in the database is equal to the ID that was in the URL. In the case of a GET request, you render an edit.

Use the Jinja2 templates and WSGI compliant more on that later There are several plugins available for Flask that can be used to improve its functionality. Great for building your backend install flask You can install Flask globally or in a virtual environment. Create a file example. Project Samples. Project Activity. Categories Frameworks. License BSD License. Follow Flask Flask Web Site. Mit einem Experten sprechen. User Reviews Be the first to post a review of Flask!

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