Example:Get your own React.js Server We'll use these two components: function MissedGoal() { return MISSED!; } function MadeGoal() { return Goal!; } Example: Now, we'll create another component that chooses which component to render based on a condition: function Goal(props) { const is...
Conditional Rendering (条件渲染) React 中, 可以创建封装你需要行为的独特组件。然而,依赖应用能够的状态只能渲染他们中的一部分。 React 条件渲染的运作方式和 JavaScript 中条件分支结构的运作方式相同。使用 JavaScript 条件操作,例如if或者 [conditional operator]() 来创建显示当前状态的元素,让 React 更新 UI 来...
React:Conditional Rendering(条件渲染) 就像JS中常常会根据条件(比如if/else、switch)返回不同的值,React中也可以根据组件的状态或其他参考条件返回不同的React Element。 比如根据用户是否登陆渲染对应的UI面板。 1class LoginControl extends React.Component {2constructor(props) {3super(props);4this.handleLoginCli...
React conditional rendering 1. DEMO#1 * Greeting.js import React from 'react'; class Greeting extends React.Component { constructor(props) { super(props) } render() { const isLoggedIn = this.props.isLoggedIn; if (isLoggedIn) { return <UserGreeting />...
}ReactDOM.render(<GreetingisLoggedIn={true}/>,document.getElementById('example') ); 一、元素变量(Element Variables) 可以使用变量来存储元素。可以有条件地渲染组件的一部分,而输出的其余部分不会更改。 classLoginControlextendsReact.Component{constructor(props) {super(props);this.handleLoginClick=this.han...
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Conditional rendering in React Native is similar to conditional rendering in React. However, keep in mind that with React Native, we can only render strings within the Text component. Code Example: import React, {Component} from 'react'; import {Text, View} from 'react-native'; const Hello...
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yarn add react-rendering-conditional or npm install react-rendering-conditional --save Usage import {Conditional, If, Else} from 'react-rendering-conditional'; <Condition> <If is={this.state.authenticated}> If condition </If> <Else> Else Condition </Else> </Condition> It also support for El...
Conditional rendering refers to changing the behavior of an app depending on its state. For instance, you can change the greeting message of your React app to dark during the night. This way you have a different display message depending on the time of day. Conditional rendering allows you to...