How to add JavaScript to a Drupal page?

How to add JavaScript to a Drupal page?

There are two ways for Themes to easily add JavaScript to a page. 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.

What kind of JavaScript is used in Drupal 7?

In addition to custom JavaScript files many Drupal developers find jQuery useful. jQuery is a lightweight JavaScript library which is built into Drupal. jQuery contains all the common DOM, event, effects, and Ajax functions. Drupal 7 includes jQuery 1.4.4 and jQuery UI 1.8.7.

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.

The Drupal API function drupal_add_js () lets you add a JavaScript file, setting or inline code to the page and it takes 5 parameters (see the api reference). The first parameter is always going to be a path to a js file, an array, or a piece of JavaScript code.

How to include a JavaScript file in a module?

I then add scripts [] = js/prf2.js in the .info file, but it throws this error. This is the right & simple way to include any JS file in Drupal 7. Create a folder named i.e. js, inside your module folder. Inside that folder place (modulename).js file. Clear Cache & Run.

How to add JavaScript to a module or theme?

If the second parameter is ‘module’ (the default), ‘theme’, or ‘core’, then the first parameter must be a path and the only difference between these three is the order in which the script tag will be placed relative to other scripts, i.e. core scripts first, then module scripts and finally theme scripts.

How are Drupal 7 libraries related to jQuery?

Libraries are collections of JavaScript, CSS, and dependent libraries. For example, Drupal 7 includes jQuery UI. jQuery UI is a component library with internal dependencies. When ui.autocomplete is included it needs ui.core and ui.position to be included as well. Drupal libraries takes care of this for us.

Why is script.js default in Drupal 6?

This ordering is important because it allows the theme JavaScript an opportunity to act on the page after the JavaScript providing the functionality within the page. In Drupal 6 there is a default script file, named script.js that can be added to a theme without specifying it in the .info file.

Is there a default script file in Drupal 6?

In Drupal 6 there is a default script file, named script.js that can be added to a theme without specifying it in the .info file. If that script is included in the theme it will be automatically added to all pages. In Drupal 7 all script files need to be specified.

Why does Drupal not load CSS on every page?

Drupal uses a high-level principle: assets (CSS or JS) are still only loaded if you tell Drupal it should load them. Drupal does not load all assets on every page because it slows down front-end performance.

How to add stylesheets to a Drupal theme?

Declare the dependency with an extension name followed by a slash, followed by the library name, in this case core / jquery. If another library required cuddly – slider it would declare: fluffiness / cuddly – slider, the theme name, followed by the library name.

How to define a library in Drupal 7?

In Drupal 7 libraries had to be defined using hook_library_info(). That has been replaced with *. libraries. yml file. Save the CSS or JS to a file using the proper naming conventions and file structure. Define a “library”, which registers these CSS/JS files with your theme.

In some cases, you may want to add JavaScript to a page that depends on some computed PHP information. You can do so with drupalSettings (the successor to Drupal 7’s Drupal. settings ), an array of settings defined in your PHP script that can be accessed as settings object in your JavaScript.

How to attach a library to a render array in Drupal?

Attaching to a render array of a Block Plugin To give another example of attaching a library to a render array, If you are building a block plugin in your module, you can attach the libraries to the render array in the build () function of your class extending the BlockBase class (as of Drupal 8 beta 6).

For themes, see Adding stylesheets (CSS) and JavaScript (JS) to a Drupal theme. In Drupal 8 and later versions, stylesheets (CSS) and JavaScript (JS) are loaded through the same system for modules (code) and themes, for everything: asset libraries.

How to add assets to a Drupal module?

“Attach” the library to a render array in a hook. But in the case of themes, there is an alternative to step 3: themes can choose to load any number of asset libraries on all pages. To define one or more (asset) libraries, add a *. libraries. yml file to the root of your module folder (alongside your .info.yml file).

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.