AJAX WordPress Error
Asynchronous JavaScript and XML allow websites to respond to clicks and display updated content without forcing your browser to refresh the page. WordPress uses AJAX throughout its administration interface, and plug-ins frequently take advantage of AJAX to enable a variety of features. Occasionally a plug-in conflict or poorly written code will cause an AJAX error. Through troubleshooting you can isolate the problem file.
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How AJAX Works
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When a visitor interacts with an object on an AJAX-enabled Web page, the page's JavaScript sends information on that interaction to the server, which in turn sends XML code back to the visitor's browser. The JavaScript program interprets and displays the new information in real time, without forcing the entire page to refresh. AJAX is considered a "Web 2.0" technology and is used by many popular sites, including Google, Facebook and Flickr.
AJAX and WordPress
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The core WordPress product uses AJAX only in its administration area, for functions like moderating comments and deleting categories and posts. Third-party plug-ins and themes can use AJAX for a variety of features both within the admin area and on public pages, including shopping carts, image galleries and online voting. WordPress supplies AJAX functionality to developers in its admin-ajax.php file and includes the jQuery library to handle form submission, but each developer must create JavaScript code to handle the specific functions in the theme or plug-in.
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AJAX Errors
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When the JavaScript code cannot execute a command or receives an unexpected result, the result is an AJAX error. The message after the words "AJAX Error" can vary, but the cause is usually the same: a problem with a plug-in or theme file. Two plug-ins using AJAX may be conflicting; for example, one plug-in requires a core file, and a second plug-in requires it again, causing a conflict.
Troubleshooting
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When you encounter an AJAX error immediately after installing a new plug-in or theme, disable that plug-in or theme and contact its developer. To track down a potential conflict, begin by disabling all installed WordPress plug-ins and verify that the theme works without error. Enable plug-ins one at a time and test for the problem after you add each plug-in. After you narrow down the problem plug-in or theme, check the WordPress support forums to see if the issue is known, contact the plug-in developer or use a different plug-in for the same function.
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References
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