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To create an input field that contains only allowed numbers using React.js: 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 {useSt...

Passing functions as props in React TypeScript: Define the type of the function property in the component's interface. Define the function in the parent component. Pass the function as a prop to the child component. interface ButtonProps { sum : ( a: ...

When we pass a value that is not a function to the onClick attribute of an element, we get the error Expected onClick listener to be a function . To fix the error, make sure you only pass a function to the onClick attribute of an element. const App = ...

We can export multiple components in React using named exports, such as export function A() {} and export function B() {} . We can import the exported components using named imports, such as import {A, B} from ./another-file . We can use the same name...

When two or more elements returned from the map() method have the same key property, a React error Encountered two children with the same key will occur. To fix this error, you need to provide a unique value for the key prop of each element or use ind...

To check if a prop was passed to a component in React: Compare the prop to undefined. If the prop is equal to undefined, then it was not passed to the component. Otherwise, it was passed to the component. const Button = ({withIcon}) = { if...

To clear a timeout or interval in React using hooks: Use the useEffect hook to set a timeout or interval. Return a function from the useEffect hook. Use the clearTimeout() or clearInterval() method to remove the timeout when the component unmounts. , ...

React.js error Expected corresponding JSX closing tag appears when we forget to close a tag in the JSX code. To fix the error, use self-closing tags like input / and make sure the order of opening and closing tags in the JSX code is correct....

Set the displayName property on your component to fix the Component definition is missing display name error, e.g. App.displayName = MyApp; . Alternatively, disable the ESLint rule for the line with the following comment - // eslint-disable-next-line ...

Use the borderRadius CSS property to set the border radius style of elements in React, such as div style={{border: 1px solid red, borderRadius: 30px}} . If we need to set the style of a specific border, use the corresponding property, such as borderBo...

To fix the error Export useHistory was not found in react-router-dom , use the useNavigate hook instead, e.g. const navigate = useNavigate() . This hook returns a function that allows us to navigate programmatically. // ?️ import useNavigate...

To set default values ​​for Input elements in React: Pass the default value as a parameter to the useState hook for controlled fields. Set the defaultValue property on uncontrolled input fields. import {useRef, useState} from react ; export defaul...

To set conditional initial values ​​for useState in React: Pass a function to the useState hook. Use a condition to determine the correct initial value for the state variable. The function will only be called on the initial render. import {useStat...

To fix the issue of input fields not working in React, make sure to use the defaultValue property instead of the value of the uncontrolled input field. Alternatively, set an onChange property on the field and handle the change event. Here is an exampl...

To type the useState hook in React as an array of strings, use the hook's generics, such as const [names, setNames] = useStatestring[]([]) . State variables can be initialized to an empty array or an array of strings, and only accept string values....