Skip to main content

Hooks in Drupal

                 
Hi All ,


           For Every Drupal Developer initially get strucked with the concept of drupal is Hooks.
It is the major driven approach in the old versions of drupal but  hooks are there in  drupal 8 too .
                 Inorder to describe about  hook i dont want to explain with simple  statements or definitions.

I assume that below points will make you clear in the concept of hooks in drupal 8.

1. Hooks occur at various points in the thread of execution, where Drupal seeks contributions from all the enabled modules.

2.A hook can be thought of as an event listener in the sense that an event triggers an action. The event in Drupal, such as deleting a node, would trigger the hook "hook_delete".

3.One way for modules to alter the core behavior of Drupal (or another module) is to use hooks. Hooks are specially-named functions that a module defines (this is known as "implementing the hook"), which are discovered and called at specific times to alter or add to the base behavior or data

4.Hooks are documented in *.api.php files

5.Core Library also define the Hooks same as modules

6.Best Tutorial About Hook system in Drupal http://alanstorm.com/drupal_module_hooks/

7.Hooks are an implementation of the Mediator pattern

Comments

Post a Comment

Popular posts from this blog

Things You Must Know Before Trying Forms In Drupal 8.

 You Should Invest In Forms                      What does your customer think?  What do they looking for? will decide the success of any business.    In a digital marketing, Most of the customer requirement is gathered through forms. So its   essential  to spend some  time with forms Example : a user can search a particular product using the search form on an e-commerce website. Form API in Drupal 8          As we know already Drupal use forms for most of the administrative site building. Drupal 8 follows object-oriented style of programming with the integration of symfony . Based on the purpose of the form, it can inherit the basic properties and methods of the below classes. 1.Config Base 2.FormBase 3.ConfirmBase   Note : Routing configuration is done through the yml files in drupal 8 When the user hits the va...
Post a Comment
Read more

Comparison Between Drupal 7 and Drupal 8

Well in the learning process of drupal ........, This is my second post..if you missed previous article please refer the following  link. What is drupal and what is cms As i said in my pervious article ,drupal is an open source framework .We can easily download it from  Drupal  official link. As a extensive contibution of drupal community we are getting improved versions of drupal. Currently   Drupal 7 and Drupal 8 is activily maintained by the community. Lets find out the major difference between drupal 7 and drupal 8 Structure 1.Drupal 7 is based on procedural programming 2.Drupal 8 is  mainly focused on object oriented programming Template engine 1.Drupal 7 is based on the  php template engine 2.Drupal 8 is based on  twig template engine Routing 1.page callback functions are utilised  for each every page request   in drupal 7 2. Yml files are used to handle the routing configuration of the each p...
Post a Comment
Read more

Why drupal is not fully object oriented ?

You can see module hooks are still in a procedural way to  utilize a dependent service  That's why we have a static  Drupal Class , it can get a service in a procedural context. How to access a service in module hooks? Drupal::service('{service id}') or  service accessors like Drupal::request(), Drupal::currentUser(), Drupal::entityManager(). It is providing a uniform way of getting any services inside hooks and it eases the transition from procedural code to injected oops code. How a container get services in drupal?  The container is built by the kernel  and passed to the static Drupal Class and the container gets all the services from the system by the below methods    1. \Drupal\Core\CoreServiceProvider    2.  the service providers of enabled modules     3. any other service providers defined in $GLOBALS['conf']['container_service_providers']. How you can improve the dependent service access from module ?  fu...
Post a Comment
Read more