useRef
/*
A common use case is to access a child imperatively:
*/
function TextInputWithFocusButton() {
const inputEl = useRef(null);
const onButtonClick = () => {
// `current` points to the mounted text input element
inputEl.current.focus();
};
return (
<>
<input ref={inputEl} type="text" />
<button onClick={onButtonClick}>Focus the input</button>
</>
);
}use ref in component reactjs
class CustomTextInput extends React.Component {
constructor(props) {
super(props);
this.textInput = null;
this.setTextInputRef = element => { this.textInput = element; };
this.focusTextInput = () => { // Donne le focus au champ texte en utilisant l’API DOM native. if (this.textInput) this.textInput.focus(); }; }
componentDidMount() {
// Focus automatique sur le champ au montage
this.focusTextInput(); }
render() {
// Utilise la fonction de rappel `ref` pour stocker une référence à l’élément
// DOM du champ texte dans une propriété d’instance (ex. this.textInput)
return (
<div>
<input
type="text"
ref={this.setTextInputRef} />
<input
type="button"
value="Donner le focus au champ texte"
onClick={this.focusTextInput} />
</div>
);
}
}Copyright © 2021 Codeinu
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