How to Work with Lists in React.Js

How to Work with Lists in React.Js

React is a JavaScript library designed for developing quick and interactive user interfaces for web and mobile applications. It is an open-source, component-based, front-end library accountable only for the application’s view layer. In Model View Controller (MVC) architecture, the view layer is liable for the app’s looks and feel. React was founded by Jordan Walke, a software engineer at Facebook.

React’s fame today has overshadowed that of all other front-end development frameworks. Here is why:

React makes it more comfortable to create powerful and dynamic web applications because it demands less coding and contributes more functionality than JavaScript, where coding often gets complex instantly.

React utilizes Virtual DOM, thereby creating web applications quicker. Virtual DOM matches the components’ previous states and updates only the Real DOM items that were modified, instead of refreshing all of the features again, as traditional web applications do.  

Components are the building blocks of any React application, and a single app typically consists of various ingredients. These segments possess their philosophy and controls, and they can be reused everywhere in the application, which in turn dramatically lessens the application’s evolution time. 

React accompanies a unidirectional data flow. This means that when creating a React app, developers often nest child components within parent components. Since the data moves in a single direction, it becomes simpler to debug errors and understand where an obstacle occurs in an application at the moment in question. 

React is simple to learn, as it primarily combines basic HTML and JavaScript concepts with remarkable helpful additions. Still, as is the problem with other tools and frameworks, you have to spend some time to get a decent understanding of React’s library. 

We already know that React is utilized to build web applications, but that’s not the only thing it can do. There is a framework named React Native, procured from React itself, that is hugely successful and is employed for creating mobile applications. So, in truth, React can be utilized for making both web and mobile applications. 

Facebook has delivered a Chrome extension that can be utilized to debug React applications. This allows quicker and easier ways of debugging React web applications. 

The earlier reasons support the React library’s reputation, and it is being utilized by many organizations and businesses. 

Output 

Lists are handy when it comes to developing the UI of any website. Lists are mainly used for displaying menus on a website, for example, the navbar menu. In conventional JavaScript, we can use arrays for creating lists. We can produce lists in React in a similar manner as we do in standard JavaScript. 

Let us now generate a list in React. Render the list in the below code as an unordered list in the browser rather than only logging in to the console. We will traverse the list using the JavaScript map() function and update elements to be embedded between <li> </li> elements. Finally we will enclose this new list within <ul> </ul> elements and render it to the DOM. 

The above code will be shown list as below  

1. react native flatlist: 
This is a convenient react utility component designed to simplify handling the rendering list with ease. It can take grouping, sorting, filtering, searching, sorting, paginating, styling with very simple props. 

Instate 

Assure that react and react-dom version 16.8.0+ should be installed 

npm install flatlist-react 

Quick Start 

Take into consideration the following list passed to component PeopleList: 

Now inside the component file, a function renderPerson would pass to renderItem:

2. react dropdownlist

Simple Dropdown inspired by react-select

Why

Basic usage of react-dropdown  

3. react native list view  

Create a list in React Native. We will import the List in our Home component and show it on screen. 

Use map() method as this will iterate over various items and render each one. 

5. material ui list   

Material-UI is a customizable and straightforward component library to build faster, beautiful, and more accessible React applications. Follow your design system, or start with Material Design.

 Refresh browser and will see a button with the words press me.

6. react todo list

Create populating todo list items.

Display data of a simple array having a list of countries in it. We will use .map to render the item in React. 

We needed to show data in nested form. 

We can create a simple collapsible component in react js. We will be passing the heading as a property to the element, and the .jsx that gets wrapped inside the component would be toggled on clicking the header. 

ReactJs can create sorting lists as below: 

In ReactJs we can add or remove dynamically from the list as below: 

A basic understanding of JavaScript (ES6) and React is required. The following needs to be installed on your machine: 

Create a new empty directory news-app and run npm init -y from within it to initialize the project with a package.json file.

We will bootstrap our React application with create-react-app.  

command: 

Once the installation process is completed, run the command below to set up your React application: 

Install the other dependencies; we will need to build the app frontend. 

pushid helps us generate a random ID string which we’ll be needing when creating the news feed. Run yarn start to launch the development server once all the dependencies have been installed. 

Let’s install a simplistic Express server to fetch news items from and trigger real-time updates with Pusher. 

npm install express cors dotenv newsapi Pusher –save Create a new server.js file and open it up in your text editor. Add the following code to server.js: 

Once the /live endpoint is connected, news articles about bitcoin are regained from newsapi.org and transmitted back to the client.

Begin the server by running node server.js from the root of your project directory. At this detail, news feed updates in real-time. 

Conclusion  

React.js is a very new but also established library to make reusable view components that are encapsulated, sharable and easy to maintain. Many companies are using it in their production environments. The community is very active and extends React.js with new functionality on a daily basis. 

Learning React can make a world of difference to your career. React.js experts are highly sought after by established companies, to build user interfaces and help in the transition from old-fashioned technologies to one of the hottest new view libraries currently available. 

Keys support React to identify which items have been modified, are combined, or are eliminated. Keys should be assigned to the elements inside the array to provide the elements with a steady identity. 

React keys are essential when working with dynamically created components or when your lists are altered by users. 

Setting the key value will keep components unique, later after the conversion. 

Let’s dynamically generate Content elements with a unique index(i). 

The mapfunction() will generate three elements from our data array. Since the key-value needs to be unique for every aspect, we will assign i as a key for each built element. 

The default HTML select component is hard to style 

Fulfills requirement of grouped menus 

if Advanced select is required, check react-select

Node.js (v6 and above) 

Npm 

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