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Articles by Shyam Hande
Page 5 of 5
Lifting state up in React.js
Often there will be a need to share state between different components. The common approach to share state between two components is to move the state to common parent of the two components. This approach is called as lifting state up in React.jsWith the shared state, changes in state reflect in relevant components simultaneously. This is a single source of truth for shared state components.ExampleWe have a App component containing PlayerContent and PlayerDetails component. PlayerContent shows the player name buttons. PlayerDetails shows the details of the in one line.The app component contains the state for both the component. The selected ...
Read MoreWorking with forms in React.js
In simple html form, the form elements keeps value with it internally and submit on form submission button.Example Form Example User Name: In above example, we have a simple input called username and we can receive its value on form submission. The default behavior of html form is to navigate to new page i.e. the post form submission page.But it can give more advantage if we have a form submission handler JavaScript function which can validate the form data as ...
Read MoreWorking with lists and keys in React.js
Displaying a list on UI in ReactMap is JavaScript function which will return a new array for provided array as shown below −const originalNumbers = [ 2, 4, 6, 8, 10]; const squaredNumbers = originalNumbers.map( (number)=> number * number); console.log(“Squared Numbers==”squaredNumbers);Building a list in React is similar with the use of map function. Instead of just returning a square number , we will return a list element with value of square.const originalNumbers = [ 2, 4, 6, 8, 10]; const squaredNumbersList= originalNumbers.map((number) => {number*number} );Render on the screen with ui tag −ReactDOM.render( { squaredNumbersList }, document.getElementById('root') );When ...
Read MoreHandling events in React.js
There are some syntactical differences in writing events but it is handled similar to DOM elements event handling.The name of event handlers are written in camel case notations.ExampleEvent in simple html − Add User Event in React with jsx: Add User One of the difference is we do not write return false to prevent default behavior in React. Instead of that we specifically write event.preventDefault()ExampleIn simple Html − Add User In React it will be written as −function addUser(event){ event.preventDefault(); console.log(‘Add user event clicked’); } Add User Here event passed in ...
Read MoreRendering elements in React.js
The smallest building blocks of React applications are the elements. Example of an element is −const message = Welcome, Steve;React DOM updates the actual DOM with the converted react elements. React components are made up of elements.Rendering element on DOMWe will have a parent div element in the main html file . This div can be called as root. ReactDOM manages everything which is inside the app div. We can add multiple such an isolated div in applications if required.To render the element it will be passed to the ReactDOM render method −const message = Welcome, Steve; ReactDOM.render(message, document.getElementById('app'));This will ...
Read MoreDisplay hello world using React.js
create-react-app is a command to create a React.js project with default configuration. Create-react-app will help in running react applications. Command will be executed on npm or yarnIf npm and node.js is installed on computer, install create-react-app globally with command −npm install –g create-react-appCreation of project − to create a project once above commands are executed, run below command −npx create-react-app hello-world-examplenpx comes with npm version 5.2+ , npm version can be checked on terminal using npm –versionIf npm version is 5.2+, then react.js project can be directly created with command −npx create-react-app hello-world-exampleIf npm version is 6+, npm init react-app ...
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