Edward Jackson

Edward Jackson

1563502782

How to implement server-side pagination in React with Node.js

The example contains a hard coded array of 150 objects split into 30 pages (5 items per page) to demonstrate how the pagination logic works. Styling of the example is done with Bootstap 4.

Running the React + Node Pagination Example Locally

  1. Install NodeJS and npm from https://nodejs.org.
  2. Download or clone the tutorial project source code from https://github.com/cornflourblue/react-node-server-side-pagination.
  3. Install required npm packages of the backend Node API by running the npm install command in the /server folder.
  4. Start the backend Node API by running npm start in the /server folder, this will start the API on the URL http://localhost:4000.
  5. Install required npm packages of the frontend React app by running the npm install command in the /client folder.
  6. Start the React frontend app by running npm start in the /client folder, this will build the app with webpack and automatically launch it in a browser on the URL http://localhost:8080.

Server-Side (Node.js) Pagination Logic

Below is the code for the paged items route (/api/items) in the node server file (/server/server.js) in the example, it creates a hardcoded list of 150 items to be paged, in a real application you would replace this with real data (e.g. from a database). The route accepts an optional page parameter in the url query string, if the parameter isn’t set it defaults to the first page.

The paginate() function is from the jw-paginate package and accepts the following parameters:

  • totalItems (required) - the total number of items to be paged
  • currentPage (optional) - the current active page, defaults to the first page
  • pageSize (optional) - the number of items per page, defaults to 10
  • maxPages (optional) - the maximum number of page navigation links to display, defaults to 10

The output of the paginate function is a pager object containing all the information needed to get the current pageOfItems out of the items array, and to display the pagination controls in the React frontend, including:

  • startIndex - the index of the first item of the current page (e.g. 0)
  • endIndex - the index of the last item of the current page (e.g. 9)
  • pages - the array of page numbers to display (e.g. [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ])
  • currentPage - the current active page (e.g. 1)
  • totalPages - the total number of pages (e.g. 30)

I’ve set the pageSize to 5 in the CodeSandbox example above so the pagination links aren’t hidden below the terminal console when the container starts up. In the code on GitHub I didn’t set the page size so the default 10 items are displayed per page in that version.

The current pageOfItems is extracted from the items array using the startIndex and endIndex from the pager object. The route then returns the pager object and current page of items in a JSON response.

// paged items route
app.get('/api/items', (req, res, next) => {
    // example array of 150 items to be paged
    const items = [...Array(150).keys()].map(i => ({ id: (i + 1), name: 'Item ' + (i + 1) }));
 
    // get page from query params or default to first page
    const page = parseInt(req.query.page) || 1;
 
    // get pager object for specified page
    const pageSize = 5;
    const pager = paginate(items.length, page, pageSize);
 
    // get page of items from items array
    const pageOfItems = items.slice(pager.startIndex, pager.endIndex + 1);
 
    // return pager object and current page of items
    return res.json({ pager, pageOfItems });
});

Client-Side (React) Pagination Component

Since the pagination logic is handled on the server, the only thing the React client needs to do is fetch the pager information and current page of items from the backend, and display them to the user.

React Home Page Component

Below is the React home page component (/client/src/HomePage/HomePage.jsx) from the example. The loadPage() method determines the current page by checking for the value in the url query params or defaulting to page 1, then fetches the pager object and pageOfItems for the current page from the backend API with an HTTP request.

The componentDidMount() React lifecycle hook kicks off the first call to loadPage() when the React component loads, then the componentDidUpdate() React lifecycle hook calls loadPage() when the page is changed with the pagination links.

The component renders the current page of items as a list of divs, and renders the pagination controls using the data from the pager object. Each pagination link sets the page query parameter in the url using the Link React Router component with the search parameter.

The CSS classes used are all part of Bootstrap 4.3, for more info see https://getbootstrap.com/docs/4.3/getting-started/introduction/.

import React from 'react';
import { Link } from 'react-router-dom';
 
class HomePage extends React.Component {
    constructor(props) {
        super(props);
 
        this.state = {
            pager: {},
            pageOfItems: []
        };
    }
 
    componentDidMount() {
        this.loadPage();
    }
 
    componentDidUpdate() {
        this.loadPage();
    }
 
    loadPage() {
        // get page of items from api
        const params = new URLSearchParams(location.search);
        const page = parseInt(params.get('page')) || 1;
        if (page !== this.state.pager.currentPage) {
            fetch(`/api/items?page=${page}`, { method: 'GET' })
                .then(response => response.json())
                .then(({pager, pageOfItems}) => {
                    this.setState({ pager, pageOfItems });
                });
        }
    }
 
    render() {
        const { pager, pageOfItems } = this.state;
        return (
            <div className="card text-center m-3">
                <h3 className="card-header">React + Node - Server Side Pagination Example</h3>
                <div className="card-body">
                    {pageOfItems.map(item =>
                        <div key={item.id}>{item.name}</div>
                    )}
                </div>
                <div className="card-footer pb-0 pt-3">
                    {pager.pages && pager.pages.length &&
                        <ul className="pagination">
                            <li className={`page-item first-item ${pager.currentPage === 1 ? 'disabled' : ''}`}>
                                <Link to={{ search: `?page=1` }} className="page-link">First</Link>
                            </li>
                            <li className={`page-item previous-item ${pager.currentPage === 1 ? 'disabled' : ''}`}>
                                <Link to={{ search: `?page=${pager.currentPage - 1}` }} className="page-link">Previous</Link>
                            </li>
                            {pager.pages.map(page =>
                                <li key={page} className={`page-item number-item ${pager.currentPage === page ? 'active' : ''}`}>
                                    <Link to={{ search: `?page=${page}` }} className="page-link">{page}</Link>
                                </li>
                            )}
                            <li className={`page-item next-item ${pager.currentPage === pager.totalPages ? 'disabled' : ''}`}>
                                <Link to={{ search: `?page=${pager.currentPage + 1}` }} className="page-link">Next</Link>
                            </li>
                            <li className={`page-item last-item ${pager.currentPage === pager.totalPages ? 'disabled' : ''}`}>
                                <Link to={{ search: `?page=${pager.totalPages}` }} className="page-link">Last</Link>
                            </li>
                        </ul>
                    }                   
                </div>
            </div>
        );
    }
}
 
export { HomePage };


The tutorial code is available on GitHub

#reactjs #node-js #web-service

What is GEEK

Buddha Community

How to implement server-side pagination in React with Node.js

Kevin Fonseca

1567657526

Can you make an example of how to build exactly that?; using functional components(hooks)?

I’m lost in the ‘HomePage’ component.

Autumn  Blick

Autumn Blick

1598839687

How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.

A brief introduction to React Native

Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.

Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.

Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.

The popularity of React Native comes from its advantages. Some of its advantages are as follows:

  • Performance: It delivers optimal performance.
  • Cross-platform development: You can develop both Android and iOS apps with it. The reuse of code expedites development and reduces costs.
  • UI design: React Native enables you to design simple and responsive UI for your mobile app.
  • 3rd party plugins: This framework supports 3rd party plugins.
  • Developer community: A vibrant community of developers support React Native.

Why React Native is fundamentally different from earlier hybrid frameworks

Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.

React Native is very close to native. Consider the following aspects as described on the React Native website:

  • Access to many native platforms features: The primitives of React Native render to native platform UI. This means that your React Native app will use many native platform APIs as native apps would do.
  • Near-native user experience: React Native provides several native components, and these are platform agnostic.
  • The ease of accessing native APIs: React Native uses a declarative UI paradigm. This enables React Native to interact easily with native platform APIs since React Native wraps existing native code.

Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.

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Hire Dedicated Node.js Developers - Hire Node.js Developers

If you look at the backend technology used by today’s most popular apps there is one thing you would find common among them and that is the use of NodeJS Framework. Yes, the NodeJS framework is that effective and successful.

If you wish to have a strong backend for efficient app performance then have NodeJS at the backend.

WebClues Infotech offers different levels of experienced and expert professionals for your app development needs. So hire a dedicated NodeJS developer from WebClues Infotech with your experience requirement and expertise.

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Aria Barnes

Aria Barnes

1622719015

Why use Node.js for Web Development? Benefits and Examples of Apps

Front-end web development has been overwhelmed by JavaScript highlights for quite a long time. Google, Facebook, Wikipedia, and most of all online pages use JS for customer side activities. As of late, it additionally made a shift to cross-platform mobile development as a main technology in React Native, Nativescript, Apache Cordova, and other crossover devices. 

Throughout the most recent couple of years, Node.js moved to backend development as well. Designers need to utilize a similar tech stack for the whole web project without learning another language for server-side development. Node.js is a device that adjusts JS usefulness and syntax to the backend. 

What is Node.js? 

Node.js isn’t a language, or library, or system. It’s a runtime situation: commonly JavaScript needs a program to work, however Node.js makes appropriate settings for JS to run outside of the program. It’s based on a JavaScript V8 motor that can run in Chrome, different programs, or independently. 

The extent of V8 is to change JS program situated code into machine code — so JS turns into a broadly useful language and can be perceived by servers. This is one of the advantages of utilizing Node.js in web application development: it expands the usefulness of JavaScript, permitting designers to coordinate the language with APIs, different languages, and outside libraries.

What Are the Advantages of Node.js Web Application Development? 

Of late, organizations have been effectively changing from their backend tech stacks to Node.js. LinkedIn picked Node.js over Ruby on Rails since it took care of expanding responsibility better and decreased the quantity of servers by multiple times. PayPal and Netflix did something comparative, just they had a goal to change their design to microservices. We should investigate the motivations to pick Node.JS for web application development and when we are planning to hire node js developers. 

Amazing Tech Stack for Web Development 

The principal thing that makes Node.js a go-to environment for web development is its JavaScript legacy. It’s the most well known language right now with a great many free devices and a functioning local area. Node.js, because of its association with JS, immediately rose in ubiquity — presently it has in excess of 368 million downloads and a great many free tools in the bundle module. 

Alongside prevalence, Node.js additionally acquired the fundamental JS benefits: 

  • quick execution and information preparing; 
  • exceptionally reusable code; 
  • the code is not difficult to learn, compose, read, and keep up; 
  • tremendous asset library, a huge number of free aides, and a functioning local area. 

In addition, it’s a piece of a well known MEAN tech stack (the blend of MongoDB, Express.js, Angular, and Node.js — four tools that handle all vital parts of web application development). 

Designers Can Utilize JavaScript for the Whole Undertaking 

This is perhaps the most clear advantage of Node.js web application development. JavaScript is an unquestionable requirement for web development. Regardless of whether you construct a multi-page or single-page application, you need to know JS well. On the off chance that you are now OK with JavaScript, learning Node.js won’t be an issue. Grammar, fundamental usefulness, primary standards — every one of these things are comparable. 

In the event that you have JS designers in your group, it will be simpler for them to learn JS-based Node than a totally new dialect. What’s more, the front-end and back-end codebase will be basically the same, simple to peruse, and keep up — in light of the fact that they are both JS-based. 

A Quick Environment for Microservice Development 

There’s another motivation behind why Node.js got famous so rapidly. The environment suits well the idea of microservice development (spilling stone monument usefulness into handfuls or many more modest administrations). 

Microservices need to speak with one another rapidly — and Node.js is probably the quickest device in information handling. Among the fundamental Node.js benefits for programming development are its non-obstructing algorithms.

Node.js measures a few demands all at once without trusting that the first will be concluded. Many microservices can send messages to one another, and they will be gotten and addressed all the while. 

Versatile Web Application Development 

Node.js was worked in view of adaptability — its name really says it. The environment permits numerous hubs to run all the while and speak with one another. Here’s the reason Node.js adaptability is better than other web backend development arrangements. 

Node.js has a module that is liable for load adjusting for each running CPU center. This is one of numerous Node.js module benefits: you can run various hubs all at once, and the environment will naturally adjust the responsibility. 

Node.js permits even apportioning: you can part your application into various situations. You show various forms of the application to different clients, in light of their age, interests, area, language, and so on. This builds personalization and diminishes responsibility. Hub accomplishes this with kid measures — tasks that rapidly speak with one another and share a similar root. 

What’s more, Node’s non-hindering solicitation handling framework adds to fast, letting applications measure a great many solicitations. 

Control Stream Highlights

Numerous designers consider nonconcurrent to be one of the two impediments and benefits of Node.js web application development. In Node, at whatever point the capacity is executed, the code consequently sends a callback. As the quantity of capacities develops, so does the number of callbacks — and you end up in a circumstance known as the callback damnation. 

In any case, Node.js offers an exit plan. You can utilize systems that will plan capacities and sort through callbacks. Systems will associate comparable capacities consequently — so you can track down an essential component via search or in an envelope. At that point, there’s no compelling reason to look through callbacks.

 

Final Words

So, these are some of the top benefits of Nodejs in web application development. This is how Nodejs is contributing a lot to the field of web application development. 

I hope now you are totally aware of the whole process of how Nodejs is really important for your web project. If you are looking to hire a node js development company in India then I would suggest that you take a little consultancy too whenever you call. 

Good Luck!

Original Source

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Node Js Vs. React Js: Difference Between Node JS and React JS

The Js at the end of both Node and React refer to the language of JavaScript. Node and React are both the frameworks of  JavaScript. However, the ensuing language that both the frameworks have been the same, the use cases for both of these frameworks. However, they are totally different.

Some people might even argue that to find the difference between node js and react js is just like comparing a train to an airplane. Both of them work on an entirely different domain. The main reason why Node and React’s comparison is unfair is that Node.js is a framework to handle back-end, meaning it is developed to handle the server-side computations.

Meanwhile, React.js was developed to handle the User Interface and User Experience (UI/UX). Although glaringly present, the differences do not take anything away from the sheer power and the versatility that each of these frameworks brings into their respective domain. Another way to string together the main difference would be that neither Node.js or React.js are interchangeable at any stage of your web development project.

With that being said, there are individual minute differences that any developer should consider when working on their projects, such as the performance, the learning curve, the community of both the frameworks and microservices’ support. Listed below, you will find a comprehensive weighted comparison of node js vs. react js on the aforementioned grounds. But before we begin our comparison, we must first understand both Node.js and React.js intricately and discuss the various use cases of these technologies.

Read:  Difference between NodeJS and Django

Node.js

What exactly is the Node.js JavaScript framework?

The need for a robust means to handle the backend, server-side development yielded the framework we know as Node.js. Node.js was developed by Google and is based out of their V8 engine present in their web browser, i.e., Google Chrome. Node.js is a lightweight framework mainly because of its event-driven nature and the fact that it does not block the I/O. Node.js really shines the brightest when used to host API’s, access the database for the website, and serve the HyperText Transfer Protocol.

Who are the people making use of Node.js?

Node.js enjoys a very diverse clientele, with major players like Netflix, Uber, and Trello, all making use of Node.js in their backend. The reason why each of these companies uses this framework is different. Netflix, the leading online content streaming service, has to conduct A/B testing; only then would they serve the 93 million active users of their streaming service. The lightweight nature of Node.js has allowed them to serve the content swiftly. They have both reduced their startup time by over 70% and improved their scalability by shifting to Node.js.

#node js #node js vs react js #react js

sophia tondon

sophia tondon

1621250665

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