Modern JavaScript / ES6+

Modern "Once" Usage in Custom Drupal Module or Theme JavaScripts (Behaviors)

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Using once in Drupal 11 Behaviors

In Drupal 9+, the standalone once library replaced jQuery.once. In Drupal 11 it's the standard approach.

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Drupal Topics
Drupal Core APIs(38) Projects(14) Cache API(3) Field API(1) Drupal Security(1) Layout API(1) Form API(1) Entity API(1) Access Policy API(1)