Introducing the React Context API

  • The new React Context API is touted (at least on Twitter and a number of articles) as solving the need to use a state management tool, when I think in reality what it solves is easy dependency injection: Take something that lives at the top of your app and directly…
  • It essentially gives you an easy way to have state live at the top level in your component tree ( in this case) but “inject” it as a prop in a lower level component in the state tree.
  • A Consumer works hand-in-hand with the Context’s Provider, essentially allowing you to reach into your Context, and easily inject the Context’s value into a component, skipping many levels in the component tree.
  • Now that we’ve set up our Context and have created the Provider which wraps our app at the top level, we can now inject its into any of our lower level components.
  • When thinking of how to organize an app which uses React Context, I wanted to avoid having the Consumer code in the same file as the component which it “wraps”… the reason for this is because it makes it difficult to test the component in isolation.

We’ll take a look at the new React Context API, how to use it, what it does, and if it should replace Redux or MobX for your go-to state management option.
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Building an eCommerce Scraper with Node.js and React.js

  • It allows the user to type in a specific product name, to crawl multiple e-commerce sites and asynchronously return useful results to the user.
  • UI and ArchitectureBuilding the front endTo make it short, the front end is really small (only two pages: one for the search box and another one for the results).
  • I moved everything from ‘search term’ to ‘search results items’ into Redux’s state, thus making the code structure cleaner and nicer.
  • Some other problematic factors include: – Not having pre-stored information that could be useful to make predictions.Each result item consisting only of the following data: title, price, URL and thumbnail.My conclusion was to use a weighted ranking algorithm.
  • In a more complete implementation, that data could be useful for some sort of Machine Learning algorithm to predict the most useful way to rank results.

This is a quick story about how I created a simple but end-to-end e-commerce scraping web application called “crawl-io”. The goal behind this article is to provide an example of an implementation so…
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Advanced React Patterns — Exclusive Workshop

  • Making React components that can be used in multiple places is not hard.
  • What is hard is when the use cases differ.
  • Without the right patterns, you can find yourself with a highly complex component that requires a lot of configuration props and way too many if statements.

Join Kent C. Dodds and learn how to master React components.
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How to Use New React Context Api detailed � – codeburst

  • How to Use New React Context Api Context Api is available in the react16.3 so let’s build a counter using Context api.
  • Context Api helps us to pass down the data to the components without use of props at every component.In our counter app we only pass down one level.So Let’s install a react app using create-react-app – npm install -g newContext – cd newContext – npm start //to start dev serverNow…
  • app.js(using props)Now we are replacing it with context API Instead of using props in the Counter component.
  • First, we need to import NumberContext from our context.js file – app.js(uses context api)In line 39 above code tells first we are providing value to our component by wrapping our Counter component with the NumberContext.Provider.
  • The completed app looks like below image – That’s all in react documentation says Context is designed to share data that can be considered “globalâ€� for a tree of React components.

Now we are replacing it with context API Instead of using props in the Counter component.
First, we need to import NumberContext from our context.js file In line 39 above code tells first we are…
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Exploring the React Context API with Provider and Consumer

  • It explains how to use React’s new context API for passing props down the component tree.
  • Basically, React’s context API takes the clutter away of passing mandatory props, that are needed by every component, down your whole component tree.
  • Therefore you could use React’s context API to give every component access to the colored theme.
  • As you can imagine, following this way every component that needs to be styled according to the colored theme could get the necessary information from React’s context API by using the Consumer component now.
  • This Provider component uses React’s context API to pass down the state implicitly.

React’s Context API is a powerful feature for passing props down the component tree without the need to tell components in between about them. React’s context creates a Provider and Consumer component that enable us to use this powerful feature …
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How to Use New React Context API Detailed

  • React Context API is available in the react16.3 so let’s build a counter using – – Context API.
  • Context API helps us to pass down the data to the components without the use of props at every component.
  • Now we are replacing it with context API Instead of using props in the Counter component.
  • First, we need to import NumberContext from our context.js file – – In line 39 above code tells first we are providing value to our component by wrapping our Counter component with the NumberContext.Provider.
  • That’s all in react documentation says Context is designed to share data that can be considered “global” for a tree of React components.

how react context API works consumer and provider
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