Скачать или смотреть How to Return Data from jQuery AJAX .done Function to a Variable

Discover how to effectively return data from a jQuery AJAX `.done` function to a variable, avoiding common pitfalls in asynchronous programming.
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This video is based on the question https://stackoverflow.com/q/64626331/ asked by the user 'Kenan Şimşek Birusk Kuresofa' ( https://stackoverflow.com/u/9536827/ ) and on the answer https://stackoverflow.com/a/64627175/ provided by the user 'Kenan Şimşek Birusk Kuresofa' ( https://stackoverflow.com/u/9536827/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Return Data from jQuery AJAX .done Function to a Variable: A Complete Guide

When working with AJAX calls in jQuery, a common challenge developers face is how to handle data generated in a .done function. For many, the frustration comes down to seeing undefined values in the console when trying to return AJAX data to a variable. In this guide, we'll explore this issue and break down a solution in a clear and actionable way.

Understanding the Context

In your AJAX calls, the .done method is used to execute a function after a successful request. The data returned from the server is typically processed within this function, but directly returning this data to a variable visible outside of the .done function can be tricky because of JavaScript's asynchronous nature.

Here's the crux of the issue: variables defined inside your AJAX success callback (like a .done function) can't be returned directly to another outer function because the AJAX request works asynchronously. This means that the outer function might finish executing before the AJAX call has completed, resulting in an undefined output when you try to log the variable.

The Problem Demonstrated

Let's consider an implementation example where you are trying to use AJAX to load some data:

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

In this example, ajax_cevap will be undefined because the AJAX function hasn't completed when you're logging its output.

The Solution: Using a Callback Function

To capture the data returned from the AJAX call effectively, you need to make use of a callback function. Here’s how you can modify your initial implementation to correctly handle the data:

Step 1: Define Your Class

Here’s the modified Ajax_r class where we pass a callback function to handle the data once the request is complete:

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

Step 2: Set Up the Callback

Next, you need to set up the callback function when you call the yukle method. This allows you to define what should happen with the incoming data:

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

Wrapping Up

By employing a callback function, you effectively bridge the gap between the asynchronous nature of AJAX calls and the need to handle the results in a more synchronous manner within your application. This method not only helps you avoid the dreaded undefined but also facilitates better management of asynchronous responses.

Final Thoughts

This solution will assist in returning data generated by the .done function while ensuring clean and maintainable code. If you have more ideas or techniques for handling AJAX responses, feel free to share your thoughts in the comments below!