Скачать или смотреть Solving the 404 Error with Django: Fixing Your Ajax URL Parameters

Learn how to troubleshoot and resolve the `404 Error` in Django when making Ajax calls with URL parameters.
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This video is based on the question https://stackoverflow.com/q/70731052/ asked by the user 'user13137381' ( https://stackoverflow.com/u/13137381/ ) and on the answer https://stackoverflow.com/a/70731965/ provided by the user 'user8193706' ( https://stackoverflow.com/u/8193706/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the 404 Error in Django Ajax Calls

If you're diving into Django development, you may sometimes hit roadblocks when trying to make Ajax calls. One common issue that developers face is receiving 404 Not Found errors due to mismatched URL patterns. In this guide, we will explore a specific situation involving an Ajax call, identify the problem, and provide a clear solution.

Understanding the Problem

A common scenario arises when you attempt to delete an element from your database using an Ajax call. You craft a URL that includes the primary key (pk) of the element you want to delete. However, despite having the right approach based on your previous experience, the browser throws a 404 error stating that the URL pattern doesn’t match any defined in your urls.py.

Example Scenario

In our case, the user faced the following URL in the log that led to the error:

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

The error message clearly indicated that Django's URL configuration could not find a matching route.

Analyzing the Code

Let's take a look at the relevant segments of the code to identify what went wrong.

urls.py

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

views.py

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

myjs.js

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

In this code snippet, the function usuwanieSkladnika makes an Ajax call to a URL intended to delete a row from the database using its primary key.

Identifying the Issue

The core of the problem lies in a typo in urls.py. The defined URL pattern includes receptuta instead of receptura, which results in a mismatch when the Ajax call tries to access receptura/delSkl/13/.

Solution: Correcting the Typo

Step 1: Locate the Typo

From the code in urls.py, notice the incorrect reference:

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

Step 2: Fix the Typo

Change it to correctly reference receptura:

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

Final urls.py Should Look Like This

Here’s how your corrected urls.py will appear:

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

Conclusion

By recognizing and correcting a simple typo, you can eliminate 404 Not Found errors in your Django applications. Whenever encountering similar issues, remember to verify your URL patterns, as they are crucial for the accurate functioning of your Ajax calls. This small oversight can make a significant difference in your development experience, allowing you to focus on building rather than troubleshooting errors.

Happy coding!