class App extends Component { render() { return <h1> { { 'positive': '+', 'negative': '-' }[param] } </h1>; } } Here we utilize a plain JavaScript object to render a string conditionally. In this case, it has two properties with two values. Ultimately, you’ll get a value...
import{nextTick,ref}from'vue';constrenderComponent=ref(true);constforceRender=async()=>{// Here, we'll remove MyComponentrenderComponent.value=false;// Then, wait for the change to get flushed to the DOMawaitnextTick();// Add MyComponent back inrenderComponent.value=true;}; In a scenario...
The structure of a higher-order component According to React’s documentation, a typical React HOC has the following definition: “A higher-order component is a function that takes in a component and returns a new component.” Using code, we can rewrite the above statement like so: const new...
importReact, {Component}from"react";classDemo3extendsComponent{constructor() {super();this.state= {name:"React"}; }render() {return<div>This is Demo3 component</div>; } }exportdefaultDemo3; All these files are child components, or independent components we are going to use into a parent...
In some cases, you already have a one class name to the div element and you need to apply other class-names conditionally.We can do it by using a ternary operator inside a template literal.App.jsimport React, { useState } from "react"; import "./styles.css"; export default function ...
You will be building a completely new set of custom components, so you’ll need to start by clearing out some boilerplate code so that you can have an empty project. To start openApp.jsin a text editor. This is the root component that is injected into the page. All components will st...
You will be building a completely new set of custom components, so you’ll need to start by clearing out some boilerplate code so that you can have an empty project. To start openApp.jsin a text editor. This is the root component that is injected into the page. All components will st...
Conditionally applying CSS classes Using this syntax, we can also apply classes based on conditions. Once again, we are using the ternary operator to do so: classAppextendsComponent{constructor() {super()this.state={ isRed:true}}render() {constisRed=this.state.isRedreturn<pclassName={isRed...
In React, the ternary operator can be used to conditionally render components depending on whether or not a condition is met. userLoggedIn ? <UserDashboard /> : <Login />; JavaScript Assuming the UserDashboard and Login are both components in our React app, we use the ternary operator ...
If the user is not logged in, render the<LoginBtn/>component otherwise render the <LogoutButton/>component. The two handle functions change the login state when the respective button is clicked. Using Logical Operators You can use logical&&operator to conditionally render an element. Here an el...