react - ReactJS Refs - react js - reactjs
What is Refs in ReactJS?
- The ref is used to return a reference to your element.
- Refs should be avoided in most cases but they can be useful when you need DOM measurements or to add methods to your components.
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Using Refs
- Our example shows how to use refs to clear the input field.
- clearInputfunction is searching for element with ref = "myInput" value, resets the state and adds focus to it after the button is clicked.
App.jsx
import React from 'react';
import ReactDOM from 'react-dom';
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
data: ''
}
this.updateState = this.updateState.bind(this);
this.clearInput = this.clearInput.bind(this);
};
updateState(e) {
this.setState({data: e.target.value});
}
clearInput() {
this.setState({data: ''});
ReactDOM.findDOMNode(this.refs.myInput).focus();
}
render() {
return (
<div>
<input value = {this.state.data} onChange = {this.updateState}
ref = "myInput"></input>
<button onClick = {this.clearInput}>CLEAR</button>
<h4>{this.state.data}</h4>
</div>
);
}
}
export default App;click below button to copy the code. By reactjs tutorial team
Article tag : react , react native , react js tutorial , create react app , react tutorial , learn react
main.js
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.jsx';
ReactDOM.render(<App/>, document.getElementById('app'));
click below button to copy the code. By reactjs tutorial team
Output:
- Once the button is clicked, the input will be cleared and focused.
