Drupal

In Drupal we can able to create a Renderable table from array. This is achieved using function theme(). The theme function accepts Table header, row and attributes for table as associated array. The below syntax and example demonstrate build a table with Array.

The Commerce order will contain the information about the order that was placed. We can alter commerce order detail by loading this. With help of "field_attach_update()" function we can alter the commerce order details. The below is an example of commerce order update.

Theme debugging will help on developing our Drupal 8 site. It will suggest the TWIG file that associate for DOM structure to change. This information is appended to command in HTML that Drupal renders. We can access this information in inspecting the HTML or on developer window. When debugging is enabled the markup of each Twig template is surrounded by HTML comments that, contain theming information, such as template file name suggestions.

When Access-Control-Allow-Origin error raised when a resource is accessed from external URL use an allow by editing the .htaccess from file

In Drupal we can specify the user role wise permission for access specific fields value create, edit and delete. This can be achieved by calling the fuction "user_access()" from user core module. This function accepts permission string and user object to check. The function return boolean value TRUE is user has permission else FALSE. Below is the syntax and sample code to use user_access() function.

The Inline entity form is the Drupal Contribute module. Which help to embed a entity form into another entity. Example: Commerce product add form cam be used in Node form. This module will help to create, update and delete entity based on its parent entity. This module embed entity form as the object to its parent form. To alter this specific entity form there is hook called hook_inline_entity_form_entity_form_alter(). Below is the syntax and example to usage of hook_inline_entity_form_entity_form_alter() to alter inline forms.

Using the help of JavaScript we can able to store the values at browser(local storage). In Drupal 8 core "form.js" file help to maintain form local storage. This can be achieved by sitting boolean value to form key 'data-user-info-from-browser'. The below sample code show how to form variable to save in local storage.

For Drupal forms we can add Field Groups. These field groups are commonly HTML element, Div, HTML5, Fieldset, Vertical tabs group, Vertical tab, Horizontal tabs group, Horizontal tab, Multipage group, Multipage, Accordion group, Accordion item, Multiple fields container, Multiple fields table and Multiple fields as label-value. We can able to hide Field Groups in Form alter by different methods. Below are some types to hide the Field Groups.

In Drupal we can alter a form using the HOOK, hook_form_alter(). Webforms are used to create forms in interfaces. We can alter webform using hook_form_alter to change field types, label and custom validate or submit for our purposes. The below example will show editing the webform fields and adding custom validate.

In Drupal 7 we can directly configure the Public and Private file at "/admin/config/media/file-system". But in Drupal 8 we cannot directly configure the private file system. To configure Private file system we need to specify the path in our "settings.php". The below steps help to configure Private file system for your Drupal 8.

In Drupal we can able to store files. To save Folder/Directory need to be exist otherwise system through error as Directory not exist. The below sample code help to create Directory/Folder to copy a file. The function "file_prepare_directory()" checks directory exist or not, If exist copying a file otherwise create a directory and copying the file.

In Drupal Node, User, Taxonomy, Files,.. are consider as entity. We can load the Entity information by it ID. There are two types of Entity load mechanisms, a). Entity Object(entity_load()) b). Entity Wrappered Object(entity_metadata_wrapper())

In Drupal 7 we can set permission for each user role on "/admin/people/permissions". These permission are used to restrict and give access to specific features. We can progratically able to assign the permission for the user roles. Below is the sample code how to assign permission programatically.

Entity is a object or instance of a base or extended class. Each entity have their own properties. The entity_get_info() is a function used for access entity information. Below is the sample code which show how to access the Entity information with entity ID.

In Drupal Node, User, Taxonomy, Files,.. are consider as entity. The combination of Entity type and Id is act as unique value. We can able to load each Entity as Object by using its unique id. For each update entity maintain a revision with an ID. Below is the example show how to load the revision information of a entity.

In Drupal 7 and 8 we can able to update Entities values. By default it not creating revisions for update. To Ensure revision for or changes we need to add a "revision" parameter to the Object of Entity. Below is the syntax and example of programatically updating entity with revisions.codeexpertz

Revisioning are used to store the updated values of a entity. It mainly used to maintain the historical information of the entity. Below sample code help us to load all the revision information of given entity id.

We using Drupal Commerce to store and retrieve line Items. It treat product as separate entity. The product informations are able to load by its product ID, the product information we get as Object. Using the product object we can update the values of commerce product. The below Syntax and example shows how to load commerce product and update values programatically.

MERGE is the short hand Drupal database statement used to perform both INSERT and UPDATE functionality in same code. It Will check whether record is already exits with given condition, yes then update based on condition otherwise insert a new record. The merge() is a function of Drupal 8 core class used for MERGING record based on condition records. Below is syntax and example of how to use MERGE statements in Drupal 8.

Using the object of core Drupal class we can perform database queries. Delete is the data deletion query used to remove data from Database based on conditions. The delete() is a function of Drupal 8 core class used for remove records. Below is syntax and example of how to use DELETE query in Drupal 8.