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Скачать или смотреть How to Iterate a List from Flash Message in Jinja Template Using Flask

  • vlogize
  • 2025-05-25
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How to Iterate a List from Flash Message in Jinja Template Using Flask
How to iterate a list from flash message in jinja template in python-flaskpythonhtmllistflaskjinja2
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Описание к видео How to Iterate a List from Flash Message in Jinja Template Using Flask

Learn how to effectively use Flask's flash function to iterate over list items in a Jinja template and display them neatly.
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This video is based on the question https://stackoverflow.com/q/76345764/ asked by the user 'Moeez Raza' ( https://stackoverflow.com/u/20807706/ ) and on the answer https://stackoverflow.com/a/76345821/ provided by the user 'Rob' ( https://stackoverflow.com/u/19224040/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to iterate a list from flash message in jinja template in python-flask

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The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

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How to Iterate a List from Flash Message in Jinja Template Using Flask

Flask is a powerful web framework for Python that allows developers to create dynamic web applications easily. One of the features it offers is the ability to use flash messages, which are temporary messages that can provide feedback to users. However, if you're working with a list of items and want to display them using flash messages in a Jinja template, you might run into a few challenges. Below, we'll explore how to properly iterate through a list passed via flash messages to achieve the expected result.

The Problem

You may have encountered a scenario where you want to flash a list of items in your Flask application and iterate over them in your Jinja template. However, the default behavior of the flash function returns the entire list wrapped in an additional list, which isn't what you want. Let's look at a scenario where this issue arises:

Example Code

Here's an example of how you might initially set up your Flask route and Jinja template:

[[See Video to Reveal this Text or Code Snippet]]

In your Jinja template (temp.html), you might have:

[[See Video to Reveal this Text or Code Snippet]]

Result

When you run this code, the output may look something like this:

[[See Video to Reveal this Text or Code Snippet]]

This is not the expected output you wanted, which would be:

[[See Video to Reveal this Text or Code Snippet]]

The Solution

To achieve the desired output, you need to flash each item individually instead of passing the entire list as a single flash message. Here’s how you can do this effectively:

Step-by-Step Implementation

Flash Each Item Individually: Modify the Flask route to flash each item from your list separately. This way, each item is treated as a separate message.

[[See Video to Reveal this Text or Code Snippet]]

Iterate in Jinja Template: In your Jinja template, you can keep the same iteration logic since get_flashed_messages() will now return each message separately.

[[See Video to Reveal this Text or Code Snippet]]

Final Thoughts

With these changes, running your Flask application again will result in the following output in the Jinja template:

[[See Video to Reveal this Text or Code Snippet]]

This approach not only simplifies the process of flashing messages but also ensures that your user receives clear and individual notifications for each item.

By following the steps outlined above, you can confidently work with flash messages in Flask and display lists in your templates seamlessly.

In summary, remember to iterate through your list and flash each item separately for the best results!

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