EN
React - increment state value (class component)
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In this article, we would like to show you how to increment state value in React.
Quick solution:
this.setState({ value: this.state.value + 1 })
Below example presents how to create a simple counter using a component's state. With setState method, we increment value on every click event.
Runnable example:
// ONLINE-RUNNER:browser;
//Note: Uncomment import lines during working with JSX Compiler.
// import React from react';
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
value: 0,
};
}
render() {
return (
<div>
<button onClick={() => this.setState({ value: this.state.value + 1 })}>
click me
</button>
<br />
<label>{this.state.value}</label>
</div>
);
}
}
const root = document.querySelector('#root');
ReactDOM.render(<App />, root );