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General Tech Bugs & Fixes 2 years ago
Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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I want to array items on after another. But it is only displaying the last element of the array.
Expeb.com/tag/c">cted output is displaying "a" after 2 seb.com/tag/c">conds "b" and so on.
import Reab.com/tag/c">ct, { Component } from "reab.com/tag/c">ct" export default b.com/tag/c">class Main extends Component { b.com/tag/c">construb.com/tag/c">ctor(props) { super(props) this.state = { role: ["a","b","b.com/tag/c">c"], display: "", } } b.com/tag/c">componentDidMount() { for (let i of this.state.role) { setTimeout(() => { this.setState(() => { display: i}) }, 2000) } }) } render() { return ( <> <h3>{this.state.display}h3> ) } }
The problem is that you are using a loop to create a timeout on componentDidMount. In such a case what would happen is that the loop will complete immedialtely creating 3 timers which resolve at nearly the same 2sec interval from the start and setState then batches all the three state update calls resulting in only the last one to be displayed.
In order to solve this you can make use of setInterval like below
setInterval
class Main extends React.Component { constructor(props) { super(props) this.state = { role: ["a","b","c"], display: "", } } componentDidMount() { var index = 0; this.timer = setInterval(() => { this.setState({ display: this.state.role[index]}); index = (index + 1)%(this.state.role.length); }, 2000) } componentWillUnmounnt() { clearInterval(this.timer); } render() { return ( <React.Fragment> <h3>{this.state.display}h3> React.Fragment> ) } } ReactDOM.render(<Main />, document.getElementById('root')); src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"> src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"> id="root"/>
class Main extends React.Component { constructor(props) { super(props) this.state = { role: ["a","b","c"], display: "", } } componentDidMount() { var index = 0; this.timer = setInterval(() => { this.setState({ display: this.state.role[index]}); index = (index + 1)%(this.state.role.length); }, 2000) } componentWillUnmounnt() { clearInterval(this.timer); } render() { return ( <React.Fragment> <h3>{this.state.display}h3> React.Fragment> ) } } ReactDOM.render(<Main />, document.getElementById('root'));
src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"> src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"> id="root"/>
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