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Adding types to the useRef hook might be a little confusing at first, let’s look at why that is: import {useEffect, useRef} from react ; export function RefDemo () { const inputRef = useRef (); useEffect ( () = { inputRef. current . fo...

To qualify the useState hook object in React, use the hook's generic type, for example, const [employee, setEmployee] = useState{name: string; salary: number}({name: ,salary: 0}) . The state variable will only accept key-value pairs of the specified t...

Use the textDecoration property to add a strikethrough to text in React, for example, span style={{textDecoration: line-through}} . The text-decoration CSS property sets the appearance of text decoration lines. const App = () = { return ( div h2 span ...

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 =...

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....

React refs most often return undefined or null when we try to access their current properties before the corresponding DOM element is rendered. To fix this, you need to access the ref in the useEffect hook or when an event is triggered. import {useRef...

Unexpected default export of anonymous function warning is caused when we try to export an anonymous function using default export. To fix the error, name the function before exporting it. Below is a sample code Header.js that produces the above error...

When we use the useState hook to declare an empty state array but do not type the array, we get the error Type is not assignable to type never. To fix the error, use generics to type the state array, such as const [arr, setArr] = useStatestr...

To prevent a page refresh when a form is submitted in React, use the preventDefault() method on the event object, for example event.preventDefault() . The preventDefault() method prevents the browser from taking the default action, which in the case o...

The Nothing was returned from render React error occurs when we forget to explicitly return a value from a function or class component. To fix the error, explicitly return JSX from our component, use implicit returns with arrow functions, or...

To create N identical components/elements in React: Use Array.from() method to generate an array of N elements. Replace each element in the array with the actual component. Render the array of elements. function Header () { return h2 Hello world / h2 ...

React.jsAttempted import error X is not exported from appears when we try to import a named import that does not exist in the specified file. To resolve the error, make sure the module has named exports and that we are not mixing named exports with de...