How to Show Navbar Items Based on a Model Field in Django

Описание: Learn how to dynamically display navbar items in your Django application based on a model field, enhancing user navigability and experience.
---
This video is based on the question https://stackoverflow.com/q/67806582/ asked by the user 'multigoodverse' ( https://stackoverflow.com/u/1585017/ ) and on the answer https://stackoverflow.com/a/67807374/ provided by the user 'Daniel' ( https://stackoverflow.com/u/12821675/ ) 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 do I show navbar items based on a model field in Django?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
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.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Show Navbar Items Based on a Model Field in Django

When building a web application with Django, it's common to present navigation options based on the context of the current page or user selections. A frequent challenge developers face is how to filter items displayed in a navbar based on model attributes. In this post, we'll explore how to display navbar items contingent upon the parent field of a Blog model.

Understanding the Blog Model

Let's take a look at the structure of our Blog model. Here's how it is defined:

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

This model contains fields for title, content, slug, author, and the parent, which categorizes each blog into a specific section. The get_absolute_url method defines a URL pattern for each blog entry.

Displaying Blogs in the Template

In our table.html template, we currently loop through all blog entries and display them unconditionally:

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

However, we want to refine this to only show blogs that have the same parent value as the current blog being viewed. For instance, if the current page is /biology/page1, we only want to show blogs categorized under biology.

Implementing a Filter with an if Statement

One straightforward method to achieve our goal is to use a simple if statement within the template's for loop. Here's how to do it:

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

In this code segment:

We loop through each blog in blog_list.

We check if the parent of the blog matches the parent of the current_blog.

If the condition is true, we render the blog title as a link.

This approach ensures that only relevant blogs are displayed.

Alternative Approach with JavaScript

If you prefer a more interactive method, you could also filter the blog items using JavaScript. Here’s a rough outline of how this can be implemented:

Template Code

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

JavaScript Code

Here’s a simple jQuery script you might add to filter the visible items:

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

In this snippet:

Each blog list item gets a class corresponding to its parent.

The JavaScript filters out those items that do not match the current page's parent.

Conclusion

By using either the Django template if statement or a JavaScript filter, you can effectively control which navbar items are displayed based on the model field. This not only provides a cleaner user experience but also keeps your application organized and easy to navigate.

Whether you choose to implement your solution server-side with Django templates or client-side with JavaScript, both methods have their own advantages. Choose the one that best fits your application's needs. Happy coding!