handleClick react
import React, { Component } from 'react';
class App extends Component {
constructor(props) {
super(props);
this.sayHello = this.sayHello.bind(this);
}
sayHello() {
alert('Hello!');
}
return (
<button onClick={this.sayHello}>
Click me!
</button>
);
}
export default App;import React from 'react';
function App() {
function sayHello() {
alert('Hello!');
}
return (
<button onClick={sayHello}>
Click me!
</button>
);
}
export default App;<button onClick={sayHello}>Click</button>class Toggle extends React.Component {
constructor(props) {
super(props);
this.state = {isToggleOn: true};
// This binding is necessary to make `this` work in the callback this.handleClick = this.handleClick.bind(this); }
handleClick() { this.setState(state => ({ isToggleOn: !state.isToggleOn })); }
render() {
return (
<button onClick={this.handleClick}> {this.state.isToggleOn ? 'ON' : 'OFF'}
</button>
);
}
}
ReactDOM.render(
<Toggle />,
document.getElementById('root')
);
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