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To go back to the previous page with React Router: Use the useNavigate() hook, e.g. const navigate = useNavigate(); . Calls the navigate() function passed to it -1 - navigate(-1) . Calling navigate with -1 is the same as clicking the back button. impo...

To open a file input on button click in React: Set the onClick attribute on the button element. Set the ref attribute on the file input. When the button is clicked, open the file input, e.g. inputRef.current.click() . App.js import { useRef } from...

To cross out text on click in React: Set an onClick attribute on the element. When the element is clicked, check if its text-decoration attribute is set. If the attribute is set, remove it, otherwise set it to line-through. const App =...

Use spread syntax to combine multiple inline style objects in React, for example style={{...style1, ...style2}} . The spread syntax will unpack the key-value pairs of the object into a final object and the styles will be applied to the element. export...

Generates the error Functions are not valid as a React child. This may happen if you return a Component instead of from render. There are 2 common reasons: Returning a function reference instead of a component from render. Using React Router routes as...

To find an object in an array in React: Call the find() method on the array and pass it a function. The function should return an equality check for the relevant properties. The find() method returns the first value in the array that satisfies the con...

To detect when the Esc key is pressed in React.js: Add a keydown event listener to the document element. When the user presses a key, check if the key is Esc. If the key pressed is Escape, call a function or run some logic. import {u...

To check if a browser tab has focus using React: Add event listeners for the focus and blur events. If the focus event is fired, the tab has focus. If the blur event is fired, the tab loses focus. import {useE...

To delete query parameters using React Router: Use the useSearchParams hook to get the search parameters for the current location. Use the delete() method to delete each query parameter, such as searchParams.delete('q'). To update the search parameter...

In React, we use the String() function to render boolean values ​​in JSX, for example, h2{string(bool1)}/h2 . By default, boolean values ​​don’t render anything in React, so we have to convert the value to a string in order to render it. exp...

To create an input field in React.js that only contains numbers: Set the input field's type to text . Add an onChange event handler that removes all non-numeric values ​​. Save the input value in a state variable. import { useState } from reactjs...

To get the mouse position in React: Set the `onMouseMove` property on the element or add an event listener on the window object. Provide an event handler function. Access the relevant properties of the event object....

To get the value of an input when the Enter key is pressed in React: Set the onKeyDown property on the input field. When the user presses a key, check if that key is Enter. Access the value of the input field from a state variable. import { useState }...

To check if an element is in the Viewport in React.js: Set a ref attribute on the element. Use the IntersectionObserver API to track if elements intersect. App.js import {useEffect, useRef, useState, useMemo} from react ; export default function...

Add an event listener to the body element: Access the body element on the document object. Use the addEventListener() method on the body element in the useEffect hook. Remove the event listener when the component unmounts. import {useEffect} from reac...