How to add attributes in drupal 8 twig file?

Easy to use and to add attributes in drupal 8 twig file, here are some examples for attributes:
Add Class attributes..
Syntax: {{ attributes.addClass('myclass') }}
Example: <div {{ attributes.addClass('myclass') }}> <!-- any stuff here --> </div>
//here classes is the class name.
Remove Class attributes..
Syntax: {{ attributes.removeClass('myclass') }}

Example: <div {{ attributes.removeClass('myclass') }}> <!-- any stuff here --> </div>
here classes is the class name.
Add and Remove both attributes..
<div {{ attributes.addClass('myclass').removeClass('node') }}>

</div>
Add Multiple classes attribute..
{%
set classes = ['region','region-header']
%}
<div {{ attributes.addClass(classes)>
result: <div class="region region-header">

Add a setAttribute..
attributes.setAttribute($attribute, $value)
Syntax: <div{{ attributes.setAttribute('id', 'myID') }}></div>
Example: <div id="myID"></div>
 
Remove attributes..
attributes.removeAttribute($attribute)
Syntax: <div{{ attributes.removeAttribute('id') }}></div>

Check class exist or not..
attributes.hasClass($class)
Syntax:
{% if attributes.hasClass('myclass') %}
  {# here stuff #}
{% endif %}

Note: How to add attributes in drupal 8 twig file?

Why Drupal 8 Performance is better than Drupal 7?

Drupal 8 comes with Symfony framework, a high performing PHP framework with code security. Drupal 8 is faster than Drupal 7, here we have some points that can prove who is faster version in Drupal. 

1. Drupal 8 now turned on dynamic caching.
2. Drupal 8 turned on 6 week page caching for anonymous users. This makes Drupal 8 serving    anonymous user very fast.
3. Even logged in users can Benefit from performance improvement.
4. Drupal 8 does not send JavaScript to all pages, unless you need to use it.
5. Only place where Drupal 8 is slow in cold caching, if user is the first visitor of website in Drupal 8, it will be slower than Drupal 7 but because of cache improvement next time visitor will hit the page, it will be faster in Drupal 8.
6. Drupal 8 uses breakpoint media queries, which saves extra efforts to make a website responsive but in Drupal 7 does not use breakpoint media queries and has a different approach to manage how the site appears on different devices screens.
7. Drupal 8 uses Twig as a template engine. Twig is part of Symfony 2 framework and PHP based compiled template engine, however Drupal 7 uses the PHP template as default template engine and users create the templates by PHP code.
8. Symfony framework makes Drupal 8 stronger than Drupal 7 to develop secure and robust website or web applications.
9. Drupal 7 does not have powerful framework to manage its codebase. Developers still use Drupal 7 but its lack of framework features makes it hard to manage code.


Note: Why Drupal 8 Performance is better than Drupal 7?

How to replace function use in Twig template?

It's a simple way to use "Replace" function in twig file just go through simple method:

Syntax with example:                   

{#
*** replace '-' with '$' sign in vidyard ID ***
#}

{% set twig_content_variable = node.field_resources_vidyard_id.value %}    //field_resources_vidyard_id is are vidyard id field
{% set replace_value_var = '-' %}
{% set replace_with_value_var = '$' %}
{% if twig_content_variable %}
{% set vidyard_function_id = twig_content_variable|replace({ '-': '$' }) %}
{% endif %}







Note: How to replace function use in Twig template?

How to node load by name in drupal 8?

In drupal 8, we have easy way to node load by name/title. We can use "loadByProperties" function for node/user/file data.
here we are going to give an example with 3 type of entity.

Syntax 1:
$title = 'dummy';
//node load by name/title
$node_data = \Drupal::entityTypeManager()
        ->getStorage('node')
        ->loadByProperties(['title' => $title]); 
 OR

$result = \Drupal::entityQuery("node")
                ->condition('type', 'resources') // put your content type here
                ->condition('title', $title) // pass the title value or take any other condition
                ->execute();
               
Syntax 2:               
$email = 'dummymailid@gmail.com';
//load user by email id
$user_data = \Drupal::entityTypeManager()
           ->getStorage('user')
           ->loadByProperties(['mail'=> $email]); // here we can use any other property/field

          
Syntax 3:
$filr_uri = 'dummy file uri';          
//load file by uri
$file_data = \Drupal::entityTypeManager()
           ->getStorage('file')
           ->loadByProperties(['uri' => $file_uri]); // here we can use any other field


Note: How to node load by name in drupal 8?

How to delete content node programmatically in drupal 8?

Here we have simple way to 'delete content programmatically'. We can use this code in our "custom module/plugin" or  "hook_entity_predelete" or in "hook_entity_delete". Just use that simple code..

Syntax:

 $result = \Drupal::entityQuery("node")
                ->condition('type', 'resources');  // here change the content type of your
 $nids = $result->execute();

  if (!empty($nids)) {
    $nodes = \Drupal\node\Entity\Node::loadMultiple($nids);
    $nodes->delete();
  }


#Extra notes: here we can add more conditions in 'entityQuery' as per our requirement.









Note: How to delete content node programmatically in drupal 8?

How to set hreflang manually in website?

Here we are simple way to add 'hreflang' manually. We just have to add code in "html.html.twig" file.
For Front page code:

{% if is_front %}
<link rel="alternate" href="https://www.google.com/" hreflang="x-default" />
<link rel="alternate" href="https://de.google.com/" hreflang="de-de" />
<link rel="alternate" href="https://www.google.com.cn/" hreflang="zh-cn" />
<link rel="alternate" href="https://fr.google.com/" hreflang="fr-fr" />
{% endif %}

For Full website code: Without add any "if" condition.

<link rel="alternate" href="https://www.google.com/" hreflang="x-default" />
<link rel="alternate" href="https://de.google.com/" hreflang="de-de" />
<link rel="alternate" href="https://www.google.com.cn/" hreflang="zh-cn" />
<link rel="alternate" href="https://fr.google.com/" hreflang="fr-fr" />

<meta name="title" content="News Releases" />
<meta name="description" content="demo description." />
<meta name="keywords" content="demo, description" />



Note: If have any suggestions or issue regarding 'How to set hreflang manually in website?' then you can ask by comments.

How to display records in custom module with pagination?

It is simple to display record/data from database in drupal 8 with pagination, here we are going to explain by example with some simple steps:
Step 1:
Create a folder with name of "gpcustom", this is our custom module name. Now create a file "gpcustom.info.yml" for create identity of module.
and the code for this file is..

name: Student Records
description: 'Display student records'
type: module
core: 8.x

Step 2:
Create a file with name of "gpcustom.routing.yml", here we are going to declare routing means path for display record page.
and the code for this file is..

google_feeds_list:
  path: 'student/record'
  defaults:
    _controller: '\Drupal\gpcustom\Controller\gpcustomController::student_record'
    _title: 'Student Records'
  requirements:
    _permission: 'access content'   
   
// _controller: '\Drupal\gpcustom\Controller\gpcustomController::student_record'  means '\Drupal\gpcustom\Controller\viewController' is file path for function and 'student_record' is the function name.   
// _permission: 'access content' means anybody can access this page without login.
// path: 'student/record' means display record page url.
// _title: 'Student Records' means title of page.

Step 3:
Create a folder with this hierarchy '\src\Controller\' and file with name of "gpcustomController.php".
and the code for this file is..
<?php
namespace Drupal\gpcustom\Controller;
use Drupal\Core\Controller\ControllerBase;
use Drupal\Core\Database\Database;
use Drupal\Core\Url;

/**
 * Class DisplayTableController.
 *
 * @package Drupal\gpcustom\Controller
 */
class gpcustomController extends ControllerBase {

  /**
   * Returns a render-able array for a test page.
   */
  public function student_record() {
    //create table header
         $header = array(
         'id'=> t('SrNo'),
         'name' => t('Candidate Name'),
         'mobile' => t('Mobile Number'),
         'email' => t('Email ID'),
         'age' => t('Age'),
         'gender' => t('Gender'),
         'opt' => t('operations'),
         );

    //select records from table
    $query = \Drupal::database()->select('mydata', 'm');
    $query->fields('m', ['id','name','mobilenumber','email','age','gender']);
    $pager = $query->extend('Drupal\Core\Database\Query\PagerSelectExtender')->limit(3);
      // The actual action of sorting the rows is here.
    $table_sort = $query->extend('Drupal\Core\Database\Query\TableSortExtender')
            ->orderByHeader($header);
    $result = $pager->execute();
    $rows=array();
    foreach($result as $data){
        if ($data->id != 0 && $data->id != 1) {
   
        $operate = '<a href="/drupaladvance/mydata/form/mydata?num='.$data->id.'">Edit</a>|<a href="/drupaladvance/mydata/form/delete/'.$data->id.'">delete</a>';
        //print the data from table
         $rows[$data->id] = array(
             'id' =>$data->id,
             'name' => $data->name,
             'mobile' => $data->mobilenumber,
             'email' => $data->email,
             'age' => $data->age,
             'gender' => $data->gender,
             'operation' => t($operate),
           
         );
        }
    }
        //display data in site
         $form['table'] = [
         '#type' => 'table',
         '#header' => $header,
     '#rows' => $rows,
     '#empty' => t('No users found'),
     ];
      // Finally add the pager.
        $form['pager'] = array(
          '#type' => 'pager'
      );
     return $form;

    }
}
?>
So that's all for display data by csutom module in drupal 8, now clear the cache and goto the modules page '/admin/modules' and find by name your module and enable it.
and go to the URL which we decide in '.routing.yml' file.

Note: If have any suggestions or issue regarding 'How to display records in custom module with pagination?' then you can ask by comments.