Fetching data using inbuilt fetch API

All modern browsers come with an inbuilt fetch Web API, which can be used to fetch data from APIs. 
In this tech article, I will to show you how to do fetching data from the JSON Server APIs.

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import React, { useEffect, useState } from "react"

const UsingFetch = () => {
  const [users, setUsers] = useState([])

  const fetchData = () => {
    fetch("https://jsonplaceholder.typicode.com/users")
      .then(response => {
        return response.json()
      })
      .then(data => {
        setUsers(data)
      })
  }

  useEffect(() => {
    fetchData()
  }, [])

  return (
    <div>
      {users.length > 0 && (
        <ul>
          {users.map(user => (
            <li key={user.id}>{user.name}</li>
          ))}
        </ul>
      )}
    </div>
  )
}

export default UsingFetch

How to pass a Function as a Prop

Props or properties in react are a functional argument by which different components communicate with each other. 
Props is just a data/information that allows us to pass in JSX tags. 
With the help of props, we can pass values like JavaScript objects, arrays or functions, etc.

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import React from "react";

function Course(props) {
  return (
    <div>
      <ul>
        <li>{props.courseName}</li>
      </ul>
    </div>
  )
}

function App() {
  return (
    <div>
      <h1>Guvi Courses</h1>
      <Course courseName="Full Stack Development"  />
    </div>
  );
}

export default App;

The node access system

All node access modules are queried using hook_node_grants() to assemble a list of "grant IDs" for the user.
This list is compared against the table. 
If any row contains the node ID in question (or 0, which stands for "all nodes"), one of the grant IDs returned, and a value of TRUE for the operation in question, then access is granted. 
Note that this table is a list of grants; any matching row is sufficient to grant access to the node.

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entityQuery intro and examples

A node can include a few fields.
Every field is a table in the database.
So If I need to find a specific node, doing it with SQL means doing complicated queries, which might have few joins and many conditions, The Drupal platform created a simpler way to deal with it: EntityQuery

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$query = \Drupal::entityQuery('node')
  ->condition('type', 'page')
  ->condition('field_some_field', 14)
  ->accessCheck(TRUE);
$results = $query->execute();

Drupal module info file

Drupal uses .info files to store metadata about themes and modules.
For modules, the .info file is used for:

  1.  Rendering information on the Drupal Web GUI administration pages;
  2.  Provide criteria to control module activation and deactivation;
  3.  Notifying Drupal about the existence of a module;
  4.  Specifying the module's dependencies on other Drupal projects
    for general administrative purposes in other contexts.

This .info file is required for the system to recognize the presence of a module.

name: Hello World Module
description: Creates a page showing "Hello World".
package: Custom

type: module
core_version_requirement: ^9.4 || ^10

dependencies:
  - drupal:link
  - drupal:views
  - paragraphs:paragraphs
  - webform:webform (>=6.1.0)

test_dependencies:
 - drupal:image

configure: hello_world.settings
configure_parameters:
  pluginId: hello_world_plugin

php: 8.0

hidden: true
required: true

# Set the module lifecycle status deprecated
lifecycle: deprecated
lifecycle_link: https://www.drupal.org/node/3223395#s-aggregator

# Note: do not add the 'version' or 'project' properties yourself.
# They will be added automatically by the packager on drupal.org.
# version: 1.0
# project: 'hello_world'

Open Ajax Modal Dialog from Controller

Dialogs are often called dialog boxes, modal windows, or pop-up windows. 
Whatever you call them, they are a quick and easy way to display additional information without reloading the entire page. 
Dialog boxes can display just some static text, any node or form of your page, a views page, or any custom markup you'll feed them. 

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        public function requestResidenceUpload(Request $request): AjaxResponse {
            $arg = $request->get('arg1');
            
            // Add an AJAX command to open a modal dialog with the form as the content.      
            $response = new AjaxResponse();
            $modal_form = $this->formBuilder->getForm('Drupal\mymodule\Form\MyForm', $arg);
            $response->addCommand(new OpenModalDialogCommand('Upload', $modal_form, ['width' => 600, 'height'=>600]) );
            return $response;        
        }

Introduction to Web Accessibility

When websites and web tools are properly designed and coded, people with disabilities can use them. 
However, many sites and tools are currently developed with accessibility barriers that make them difficult or impossible for some people to use.

Making the web accessible benefits individuals, businesses, and society. 
International web standards define what is needed for accessibility.

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Success Message After Submitting Form

In building a custom form you must keep in mind a few issues:

elements, functionality, and response for best user experience 

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public function submitForm(array &$form, FormStateInterface $form_state) {
  $this->logger('user')->notice('Deleted %ip', ['%ip' => $this->banIp,]);
  $this->messenger()->addStatus($this->t('The IP address %ip was deleted.', [    '%ip' => $this->banIp,  ]));
  $form_state->setRedirectUrl($this->getCancelUrl());
}

How To Attach Library To A Specific Content Type

If you need to upload a library with a module during its operation, in Drupal it's called attaching file.
Attaching a library can be done in several ways depending on your needs. 
Remember that the library is always registered by its module or theme name followed by the library name. 

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function rwcenter_page_attachments(array &$attachments) {
	$attachments['#attached']['library'][] = 'rwcenter/content';
        
    $node = \Drupal::routeMatch()->getParameter('node') ?? \Drupal::routeMatch()->getParameter('node_preview');
    if (is_null($node)) {}
    else {
    	if ($node->getType()=='rwcenter') {
        	$attachments['#attached']['library'][] = 'rwcenter/content';
        }
    }        
}

Messenger Api: How to set message

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Drupal set message was deprecated in Drupal 8.5 and will be removed before Drupal 9. 
Time for a roundup of this new API and how to use it.

\Drupal::messenger()->addMessage('This is a regular message');
\Drupal::messenger()->addStatus('This is a status message, meaning status is OK or successful (green).');
\Drupal::messenger()->addError('This is an error message (red)');
\Drupal::messenger()->addWarning('This is a warning message (orange)');

PHP 8.3 Released!

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PHP 8.3 is a major update of the PHP language.
It contains many new features, such as explicit typing of class constants, deep-cloning of readonly properties and additions to the randomness functionality. As always it also includes performance improvements, bug fixes, and general cleanup.

REACT: Controlled or Uncontrolled components

The form is one of the most-used HTML elements in web development. 
Since the introduction of React, the way forms have been handled has changed in many ways.
In React, there are two ways to handle form data in our components:
The first way is the Controlled Component: 
We handle form data by using the state within the component to handle the form data. 
The Second way is Uncontrolled Component:
We let the DOM handle the form data by itself in the component. 

Controlled Component

import React, { Component } from 'react';

class App extends Component {
    state = {
        message: ''
    }
    updateMessage = (newText) => {
        console.log(newText);
        this.setState(() => ({
            message: newText
        }));
    }
    render() {
        return (
            <div className="App">
                <div className="container">
                    <input type="text"
                        placeholder="Your message here.."
                        value={this.state.message}
                        onChange={(event) => this.updateMessage(event.target.value)}
                    />
                    <p>the message is: {this.state.message}</p>
                </div>
            </div>
        );
    }
}