ReactJS Guru

professional ReactJS Developer

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Expected `onClick` listener to be a function, instead got a value of `string` type

A common mistake developers make is assigning a string value to the onClick event handler instead of a function. This results in the "Expect

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Expected an assignment or function call and instead saw an expression

The error message "Expected an assignment or function call and instead saw an expression" in React.js typically arises due to a missing retu

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How to Work With HTTP DELETE Method in React JS - React Js Guru

In this article, we are going to learn about HTTP Delete Method in React JS. Working with APIs is a very common thing and delete method is o

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How to Fix 'Adjacent JSX elements must be wrapped in an enclosing tag'

we may encounter an error message that says “Adjacent JSX elements must be wrapped in an enclosing tag”. This error message can be confusing

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Call Multiple Functions onClick in React

Creating interactive user interfaces in React often involves managing events like onClick. In This article will explore two different method

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Solve: react hook useEffect has a missing dependency - React Js Guru

React Developers frequently face the error message "React Hook useEffect has a missing dependency." This error occurs when the useEffect tri

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How to Solve the error : “can’t perform a react state update on an unmounted component”

Understanding the Error: In React, components are responsible for rendering different parts of your user interface. They can have their own state, which is a JavaScript object that holds data specific to that component. The state allows components to manage and update their data, resulting in dynamic and interactive user interfaces.

However, there are situations where a component may be removed or unmounted from the DOM. This can happen for various reasons, such as when a component is hidden, removed from the screen, or when the parent component is updated and causes the child component to be unmounted.

Now, let’s consider a scenario where you have a component that performs an asynchronous operation, like fetching data from an API. This asynchronous operation may take some time to complete. While the operation is in progress, the component is still mounted and part of the DOM.

However, if the component gets unmounted before the asynchronous operation finishes, it means that the component is no longer present in the DOM. At this point, if you try to update the state of that unmounted component, React will throw the error message “Can’t Perform a React State Update on an Unmounted Component.”

The reason for this error is that React is trying to prevent you from updating the state of a component that no longer exists in the DOM. Since the component is unmounted, there is no associated user interface element to update, and modifying the state would be meaningless.

To resolve this issue, you can implement proper handling of component mounting and unmounting. In class components, you can use the componentDidMount and componentWillUnmount lifecycle methods. In functional components, you can utilize the useEffect hook with a cleanup function.

For example, in a class component, you can use the componentDidMount method to start an asynchronous operation and store the result in the component’s state. Then, in the componentWillUnmount method, you can cancel or clean up any ongoing asynchronous operations, such as canceling an API request or clearing timers.

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React useLayoutEffect Hook - React Js Guru

In this part, we will learn about react useLayoutEffect which is almost similar to useEffect hook. React useLayoutEffect Hook is mostly have

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React useImperativeHandle Hook - React Js Guru

In this part, we will learn about react useImperativeHandle hook. In react, Data can be passed from parent to child component using props, w

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React useRef Hook - React Js Guru

In this part, we will learn about react useRef hook. React useRef hook is a special function which allows us to manipulate or change directl

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React useMemo Hook - React Js Guru

In this part, we will learn about React useMemo hook. The React useMemo returns a memoized Value when the dependency array gets changed. The

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React useCallback Hook - React Js Guru

In this part, we will learn about React useCallback hook. The React useCallback returns a memoized function when the dependency array gets c

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React useReducer Hook - React Js Guru

In this part, we will see what is React useReducer and how we use it? The job of a reducer is to reduce. If you are familiar with reducer()

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React useContext Hook - React Js Guru

In this part, we will learn about React useContext hook, useContext is a basically a method with which you can access data from the context,

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React useEffect Hook - React Js Guru

In this part, we will learn about React useEffect hook. useEffect hook is used to give effect or side effect once the application get render

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React useState Hook - React Js Guru

In this part, we will see the first and most important hook, which is React useState hook. useState hook is pretty straight forward where we

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Complete Reference of React Hooks - React Js Guru

In this part, we will start learning about react hooks, its types and working. React Hooks are introduced in react 16.8 version, If you don’