Use it for questions about JavaScript/PHP code to create asynchronous web applications.

In Drupal 6, the support for AJAX was limited to the #ahah form API property. Drupal 7 has an extended support for AJAX that starts from the #ajax form API property, and continues with a group of functions that are part of the Drupal 7 Ajax framework.

AJAX stands for Asynchronous JavaScript And XML.

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