Why is my jQuery AJAX call receiving an \'error: selector activated\' message and incorrect JSON data?

PHP Response to jQuery AJAX Call

In this discussion, we will explore the issue of returning JSON from PHP in response to an AJAX call made using jQuery.

Problem Overview

The user is facing challenges in handling the JSON response returned by PHP to jQuery's AJAX call. The issue is manifested through an "error: selector activated" message and incorrect JSON data being listed.

PHP Code Analysis

The PHP code provided appears to encode an array into JSON and echo the result. However, the $output variable is not being specified in the echo statement. To correctly output the JSON, it should be:

<code class="php">echo $output;</code>

jQuery and AJAX Code

In the jQuery and AJAX code, the dataType has been set to "json." This indicates to jQuery that it will be expecting a JSON response from the server.

JSON Data Listing

The output shown in the "Listing of supposed JSON data" section contains HTTP headers and other metadata but not the expected JSON data. This suggests that the JSON response has not been properly handled.

Solution

To address the issue, it is recommended to refactor the PHP code to return JSON using the following method:

<code class="php">header('Content-Type: application/json');
echo json_encode(array('foo' => 'bar'));
exit;</code>

This approach sets the HTTP header to "application/json" and encodes the desired JSON data before echoing it. By doing so, the correct JSON response will be returned to the jQuery AJAX call, and the "selector activated" error should be resolved.

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