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>
}useref in functional component
import React, { useRef } from '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>
</>
);
}react useref in useeffect
import React, { useEffect, useRef } from 'react';
const fooComponent = props => {
const inputBtnRef = useRef(null);
useEffect(() => {
//Add the ref action here
inputBtnRef.current.focus();
});
return (
<div>
<input
type="text"
ref={inputBtnRef}
/>
</div>
);
}useref 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.Copyright © 2021 Codeinu
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