freeCodeCamp/guide/english/certifications/front-end-libraries/react/set-state-with-this-setstate/index.md

title
Set State with this.setState

Set State with this.setState

Hint 1:

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      name: 'Initial State'
    };
    this.handleClick = this.handleClick.bind(this);
  }
  handleClick() {
    // change code below this line
       // Update the state data by using "this.setState()" method.
       // You can look to the sample inside the description for calling "setState()" method.
    // change code above this line
  }
  render() {
    return (
      <div>
        <button onClick={this.handleClick}>Click Me</button>
        <h1>{this.state.name}</h1>
      </div>
    );
  }
};

Solution

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      name: 'Initial State'
    };
    this.handleClick = this.handleClick.bind(this);
  }
  handleClick() {
    // change code below this line
    this.setState({
      name: 'React Rocks!'
    });
    // change code above this line
  }
  render() {
    return (
      <div>
        <button onClick={this.handleClick}>Click Me</button>
        <h1>{this.state.name}</h1>
      </div>
    );
  }
};

Code Explanation:

when users click the button the "handleClick()" method will be called and inside this method the data of the constuctor`s state will be updated by "setState()" method. then h1 tag will be changed with the new data of the constructor`s state.