Event Handling in React

Handling event

in the class

switchNameHandler = () => {
   console.log('clicked');
 }

 render(){
   return (
      <button onClick={this.switchNameHandler}>Switch Name</button>

bind

in order to use this

 
 constructor() {
    super();
    this.handleIncrement = this.handleIncrement.bind(this);
 }

 handleIncrement() {
   console.log("increment clicked", this);
 }

binding with arrow function

 
 handleIncrement = () => {
   console.log("increment clicked", this);
 }

Passing event arguments

 
 handleIncrement = product => {
    console.log(product);
    this.setState({ count: this.state.count + 1 });
  };

  <button onClick={ () => this.handleIncrement(product)}>Increment</button>

setState

switchNameHandler = () => {
  this.setState({person:{name:'aaa'});
 }