6/17/2023 0 Comments React contexts![]() ![]() ![]() However, functional components have become the de-facto approach of building React applications. We looked at a basic example of React Context and then, a more complex example using a dynamic context provider. React Context API works seamlessly with class components. Instead, we should utilize custom props and callback function to achieve the same. Therefore, we cannot use React Context API to transfer data from child to parent. The use of React component is to pass data from the parent to child component. 4.2 – Can we pass React Context from Child to Parent? The React Context API provides an ideal way to store and make the common data available in the entire component tree without unnecessary prop drilling. As result, component state is not a great place to store common data such as application theme, logged in user and so on. This data cannot be easily shared with several components. However, state is for local component-level data. One of the most common points is the difference between React Context and component state.īoth React Context and component state are used to store data for class components as well as functional components. 4.1 – React Context vs State – which is better? Let us look at a couple of such questions. While React Context is easy enough to understand, there are also several important questions about the topic in general. 4 – Important Questions about React Context When the user toggles the theme, the React Context update triggers a re-render with the new theme values. Then, we can extract the current theme object from the context and use it to dynamically style the button component. In the ContextButton class component, we assign the value of the Context (in this case, ButtonThemeContext) to the contextType. Since the context is a common piece of data, we will place it within its own file. We will first initialize the context using React.createContext() function. Let us build a small example application to demonstrate using React Context API with Class Components 2 – React Context Class Component Example This is where React Context becomes a better approach as compared to props. If the component tree is made of several components, prop drilling can become a huge problem and cause issues. This approach is also known as prop-drilling. Without using React Context, we need to pass the information through the component tree using Props. locale information such as preferred language or timezone.React Context API facilitates sharing of global data between various components. Conclusion 1 – When to use React Context API?.4 – Important Questions about React Context.3 – React Dynamic Context Provider for Class Component Example. ![]() 2 – React Context Class Component Example. ![]()
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