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Add with-context-api example (#5154)
* Add with-context-api example * Change next dependency to canary and fix CounterProvider import
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[![Deploy to now](https://deploy.now.sh/static/button.svg)](https://deploy.now.sh/?repo=https://github.com/zeit/next.js/tree/master/examples/with-context-api) | ||
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# Hello World example | ||
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## How to use | ||
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### Using `create-next-app` | ||
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Execute [`create-next-app`](https://github.com/segmentio/create-next-app) with [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) or [npx](https://github.com/zkat/npx#readme) to bootstrap the example: | ||
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```bash | ||
npx create-next-app --example with-context-api with-context-api-app | ||
# or | ||
yarn create next-app --example with-context-api with-context-api-app | ||
``` | ||
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### Download manually | ||
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Download the example: | ||
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```bash | ||
curl https://codeload.github.com/zeit/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/with-context-api | ||
cd with-context-api | ||
``` | ||
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Install it and run: | ||
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```bash | ||
npm install | ||
npm run dev | ||
# or | ||
yarn | ||
yarn dev | ||
``` | ||
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Deploy it to the cloud with [now](https://zeit.co/now) ([download](https://zeit.co/download)) | ||
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```bash | ||
now | ||
``` | ||
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## The idea behind the example | ||
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This example shows how to use react context api in our app. Based on WesBos example. |
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import React, { Component } from 'react' | ||
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/* First we will make a new context */ | ||
const CounterContext = React.createContext() | ||
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/* Then create a provider Component */ | ||
class CounterProvider extends Component { | ||
state = { | ||
count: 0 | ||
} | ||
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increase = () => { | ||
this.setState({ | ||
count: this.state.count + 1 | ||
}) | ||
} | ||
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decrease = () => { | ||
this.setState({ | ||
count: this.state.count - 1 | ||
}) | ||
} | ||
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render () { | ||
return ( | ||
<CounterContext.Provider | ||
value={{ | ||
count: this.state.count, | ||
increase: this.increase, | ||
decrease: this.decrease | ||
}} | ||
> | ||
{this.props.children} | ||
</CounterContext.Provider> | ||
) | ||
} | ||
} | ||
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/* then make a consumer which will surface it */ | ||
const CounterConsumer = CounterContext.Consumer | ||
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export default CounterProvider | ||
export { CounterConsumer } |
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{ | ||
"name": "with-context-api", | ||
"version": "1.0.0", | ||
"scripts": { | ||
"dev": "next", | ||
"build": "next build", | ||
"start": "next start" | ||
}, | ||
"dependencies": { | ||
"next": "^7.0.0-canary.16", | ||
"react": "^16.0.0", | ||
"react-dom": "^16.0.0" | ||
}, | ||
"license": "ISC" | ||
} |
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import App, { Container } from 'next/app' | ||
/* First we import our provider */ | ||
import CounterProvider from '../components/CounterProvider' | ||
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class MyApp extends App { | ||
render () { | ||
const { Component, pageProps } = this.props | ||
return ( | ||
<Container> | ||
{/* Then we wrap our components with the provider */} | ||
<CounterProvider> | ||
<Component {...pageProps} /> | ||
</CounterProvider> | ||
</Container> | ||
) | ||
} | ||
} | ||
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export default MyApp |
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import React, { Component } from 'react' | ||
/* First we import the consumer */ | ||
import { CounterConsumer } from '../components/CounterProvider' | ||
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export default class index extends Component { | ||
render () { | ||
return ( | ||
/* Then we use our context through render props */ | ||
<CounterConsumer> | ||
{({ count, increase, decrease }) => ( | ||
<div> | ||
<p>Counter: {count}</p> | ||
<button onClick={increase}>Increase</button> | ||
<button onClick={decrease}>Decrease</button> | ||
</div> | ||
)} | ||
</CounterConsumer> | ||
) | ||
} | ||
} |