Скачать или смотреть Resolving Error 405: Method Not Allowed in Your AJAX Requests

Learn how to troubleshoot and solve the common `Error 405` issue occurring in AJAX requests when using Flask and JavaScript.
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This video is based on the question https://stackoverflow.com/q/68602472/ asked by the user 'Vittorio Apicella' ( https://stackoverflow.com/u/3993466/ ) and on the answer https://stackoverflow.com/a/68602883/ provided by the user 'Musa' ( https://stackoverflow.com/u/1353011/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving Error 405: Method Not Allowed in Your AJAX Requests

When working with AJAX requests in web applications, encountering errors can be quite frustrating. One such common issue is the dreaded Error 405: Method Not Allowed, especially when you're trying to catch events like keydown. In this guide, we'll explore why this issue arises in your AJAX setup and how to effectively resolve it.

The Problem

Imagine you've built a form that takes user input and sends it to the server using an AJAX call. You have set everything up properly, and clicking the button works perfectly. However, when you press Enter after typing in the input field, you receive an Error 405: Method Not Allowed. This error signifies that the server received a request method that it isn't set up to accept for a particular endpoint.

What Causes the Error?

In this scenario, the error occurs because pressing Enter submits the form by default. When the form is submitted without any intervention, it sends a POST request to the root endpoint (/), which only accepts GET requests according to your Flask code. Here’s how to understand this more clearly:

Form Submission: Pressing Enter triggers a form submission.

Unexpected Route Hit: The form is configured to submit to / instead of your intended AJAX endpoint /myajax.

Method Not Allowed: Since the root route does not support POST methods, it results in the Error 405.

The Solution

To resolve this issue, you need to prevent the default form submission behavior and ensure that the AJAX request is executed correctly regardless of whether the user clicks the button or presses Enter. Here are the recommended steps you should follow:

Step 1: Update the Event Listener

Instead of setting up a keydown listener for the Enter key, listen for the form's submit event. This allows you to manage how the form behaves without causing unwanted submissions.

Step 2: Prevent Default Action

When the form submit event occurs, prevent the form from submitting in the traditional way, and call your AJAX function directly.

Here’s how you can implement these changes:

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

Step 3: Clean Up Your Code

Also, notice that you don't need multiple DOMContentLoaded event handlers. It's cleaner and more efficient to place your logic inside a single event listener.

Conclusion

By following the above steps, you should be able to eliminate the Error 405: Method Not Allowed when working with AJAX in your web applications. Just remember that form submissions can interfere with AJAX requests if not properly handled. Integrating the form submit event allows greater control over the user interactions and prevents unexpected behavior.

Now with this knowledge, you can build more interactive and robust web applications without running into frustrating errors. Happy coding!