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Implementing state lifecycle in react class component

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Disturbed Dolphin answered on December 24, 2021 Popularity 10/10 Helpfulness 2/10

answer Implementing state lifecycle in react class component

related reactjs lifecycle class components

related React Component Lifecycle

Implementing state lifecycle in react class component

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class Example extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      count: 0
    };
  }

  componentDidMount() {
    document.title = `You clicked ${this.state.count} times`;
  }
  componentDidUpdate() {
    document.title = `You clicked ${this.state.count} times`;
  }

  render() {
    return (
      <div>
        <p>You clicked {this.state.count} times</p>
        <button onClick={() => this.setState({ count: this.state.count + 1 })}>
          Click me
        </button>
      </div>
    );
  }
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: reactjs.org

Tags: class javascript lifecycle state

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Contributed on Jan 13 2022

Disturbed Dolphin

0 Answers Avg Quality 2/10

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reactjs lifecycle class components

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import React from 'react';
import ReactDOM from 'react-dom';
 
class Test extends React.Component {
    constructor(props)
    {
        super(props);
        this.state = { hello : "World!" };
    }
 
    componentWillMount()
    {
        console.log("componentWillMount()");
    }
 
    componentDidMount()
    {
        console.log("componentDidMount()");
    }
 
    changeState()
    {
        this.setState({ hello : "Geek!" });
    }
 
    render()
    {
        return (
            <div>
            <h1>GeeksForGeeks.org, Hello{ this.state.hello }</h1>
            <h2>
            <a onClick={this.changeState.bind(this)}>Press Here!</a>
            </h2>
            </div>);
    }
 
    shouldComponentUpdate(nextProps, nextState)
    {
        console.log("shouldComponentUpdate()");
        return true;
    }
 
    componentWillUpdate()
    {
        console.log("componentWillUpdate()");
    }
 
    componentDidUpdate()
    {
        console.log("componentDidUpdate()");
    }
}
 
ReactDOM.render(
    <Test />,
    document.getElementById('root'));

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: www.geeksforgeeks.org

Tags: class clas

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Contributed on Dec 24 2021

Rizz

0 Answers Avg Quality 2/10

React Component Lifecycle

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What is the order that Class components run when React initialize and mounts 
the components.

1. Regardless of React Components, constructors are always ran first 
	1. In constructor, you will just initialize the state in constructor
2. Render runs second, which determines what to show. This is the template 
   of the HTML and dictates the UI is going to be.
3. Third one that runs is componentDidMount, React runs the constructor, 
   runs the render and mounts the initial state and mounts on. Then it 
   will runs the code in componentDidMount();
   
- When setState() is called, the render() method will be called again and 
  re-renders.
	- Every subsequent child with a different props will also be re-rendered.

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 23 2022

Average Armadillo

0 Answers Avg Quality 2/10

Implementing state lifecycle in react class component

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