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>
</>
);
}useref react
import React, {useRef, useEffect} from "react";
export default function (props) {
// Initialized a hook to hold the reference to the title div.
const titleRef = useRef();
useEffect(function () {
setTimeout(() => {
titleRef.current.textContent = "Updated Text"
}, 2000); // Update the content of the element after 2seconds
}, []);
return <div className="container">
{/** The reference to the element happens here **/ }
<div className="title" ref={titleRef}>Original title</div>
</div>
}example react useRef
import React, { useState, useEffect, useRef } from "react";
import ReactDOM from "react-dom";
import "./styles.css";
function CountMyRenders() {
const countRenderRef = useRef(1);
useEffect(function afterRender() {
countRenderRef.current++;
});
return <div>I've rendered {countRenderRef.current} times</div>;
}
function App() {
const [count, setCount] = useState(0);
return (
<div className="App">
<CountMyRenders />
<button onClick={() => setCount(count => count + 1)}>
Click to re-render
</button>
</div>
);
}
const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);useRef() in react
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>
</>
);
}what does useref do react
const refContainer = useRef(initialValue);
//useRef returns a mutable ref object whose .current property is initialized to the passed argument (initialValue).
//The returned object will persist for the full lifetime of the component.when to use react ref
WHEN TO USE REACT'S REF ATTRIBUTE?
But it is not always a good idea to use the ref attribute. The general rule of thumb is to avoid it. The official React documentation mentions three occasions where you can use it because you have no other choice.
Managing focus, text selection, or media playback.
Integrating with third-party DOM libraries.
Triggering imperative animations.Copyright © 2021 Codeinu
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