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Overriding Drupal.ajax.prototype is not working

I am trying to override Drupal.ajax.prototype.beforeSend like this:

(function($) {   // In mymodule.js, which appears after ajax.js in the page build   Drupal.ajax.prototype.beforeSend = function(xmlhttprequest, options) {     console.log('overridden!')   } })(jQuery);

The file that contains the code is listed below core’s ajax.js in the page’s source, yet it’s the console.log I put inside core’s ajax.js beforeSend that is showing up.

What else is to it? Has anything been changed in Drupal? Using version 9.3. Can’t override any of those functions.

This article was republished from its original source.
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Overriding Drupal.ajax.prototype is not working

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