- Drupal Jquery Once Again
- Drupal Jquery Once Upon A Time In Hollywood
- Drupal Jquery Once Upon A Chef
- Drupal 8 Jquery Once
You can use $.once , which is available in both Drupal 7 and Drupal 8. The code called inside $.once will only be executed a single time for the HTML element it is called on. For D7, you can do this: (function ($, Drupal) function someElementWatcher (context).
- One is a jQuery method, the other is a native JS method, they both do pretty much the same thing, but append accepts multiple elements. – adeneo Apr 10 '13 at 12:51 The bottom is using a library (e.g. The commonly referenced jQuery), the top is using 'native' DOM methods to append the element.
- Drupal once (variables in URL) (version: 11). Comparing performance of: jQuery.once vs once Created: 9 months ago by: Registered User Jump to the latest.
When these two patterns are combined, everything goes fine. Still, if content is added to the page after page load the added elements will never be processed. Similarly, if the content is partially removed, the code, for instance, will not be able to update information about the already processed elements. But in Drupal there’s an API used for such purposes and it is called behavior.
Drupal Jquery Once Again
Note that when behavior should be added to elements the attach function of all registered behaviors will be invoked. It occurs both when the DOM is ready (page load) and when elements are added to the DOM. Alongside attach there’s the detach function, which can be used to detach registered behaviors from page elements. It can happen before the elements are moved or removed from the DOM or a form is submitted. As for the context parameter, it’s a parent of the added elements. The settings parameters in their turn are the settings for the context, as a rule, the Drupal.settings object as set by calls to drupal_add_js() from PHP. Besides context and settings, the detach function also expects a trigger. It’s essentially a string containing the causing of the behavior to be detached. Possible causings can be the following:
Drupal Jquery Once Upon A Time In Hollywood
- unload (the context element is being removed from the DOM);
- move (the element is about to be moved within the DOM);
- serialize (when an Ajax form is submitted, this is called with the form as the context).
Drupal Jquery Once Upon A Chef
Since a behavior is being attached and detached to and from a context, the context object can be used to restrict your jQuery queries to only the affected element or DOM subtree, like here:
Drupal 8 Jquery Once
Taking into account everything mentioned earlier, it follows that the base pattern to process elements on page load will look like this: