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How does Drupal work with JavaScript and jQuery?
Drupal uses a “behaviors” system to provide a single mechanism for attaching JavaScript functionality to elements on a page. The benefit of having a single place for the behaviors is that they can be applied consistently when the page is first loaded and then when new content is added during AHAH/AJAX requests.
How are behaviors registered in Drupal 7 JavaScript?
In Drupal 7 behaviors have two functions, one called when content is added to the page and the other called when it is removed. Behaviors are registered by setting them as properties of Drupal. behaviors. Drupal will call each and pass in a DOM element as the first parameter (in Drupal 7 a settings object will be passed as the second parameter).
How to use jQuery and closure in Drupal 7?
In Drupal 7 jQuery.noConflict() is called to make it easier to use other JS libraries, so you’ll either have to type out jQuery() or have the closure rename it for you. More examples can be found on jQuery’s api site.
How does the theming function work in Drupal?
Drupal provides a theming mechanism for JavaScript code in a similar manner to the way theming works within the rest of Drupal. This enables themes to customize the markup generated by JavaScript. Modules provide theme functions for their markup.
How to add JavaScript to a theme in Drupal?
JavaScript files can be added to a theme’s .info file using the scripts tag. For example, to add the script foo.js to every page on a Drupal site add the following to the theme’s .info file. Scripts added in a theme’s .info file is added at the theme level of ordering and will come after core/library JavaScript and module JavaScript.
Which is better drupal.behaviors or jquery.ready?
In short, Drupal.behaviors is a more modular and better way to implement jQuery.ready. Unlike jQuery.ready which only runs once when the DOM is ready for manipulation, Drupal.behaviors can be run multiple times during page execution. Even better, they can be run whenever new DOM elements are inserted into the document (i.e. AJAX-driven content).
When to use behaviors in Drupal 7 JavaScript?
The benefit of having a single place for the behaviors is that they can be applied consistently when the page is first loaded and then when new content is added during AHAH/AJAX requests. In Drupal 7 behaviors have two functions, one called when content is added to the page and the other called when it is removed.