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lg-react-mounter

v0.2.1

Published

A mini renderer for React, this renderer only trigger componentWillMount() in Server Side Rendering

Downloads

4

Readme

react-mounter

A mini renderer for React, this renderer only trigger componentWillMount() in Server Side Rendering.

why?

如何在同构化的服务端渲染中触发异步操作?有两种方法:

  1. 在路由组件中定义静态方法,比如next.js 的getInitialProps 或 Vue中建议定义的asyncData()
  2. 调用renderToString挂载一次,触发所有componentWillMount()

两种方法都有优缺点:

第一种方法,只能在路由组件的静态方法中定义需要触发的异步操作,子孙组件中不能触发异步操作。这就要求你额外地将子孙组件 中的异步操作提升到路由组件。显然不够优雅,我们更希望能够在componentWillMount() 中直接定义. 但是这个方法很快。

第二种方法,缺点可能让人无法忍受,如下面配合redux + redux-saga在服务端触发异步操作:

async function render (store, App) {
  const Component = (<App store={store} />)
  // watch ACTIONS
  store.runSaga(saga)

  // trigger all async actions
  renderToStaticMarkup(Component)

  // stop watch ACTIONS immediately
  store.end()

  // wait all async actions done
  await store.done

  return renderToString(Component)
}

我们必须使用两次renderToString(), 第一次执行用于触发所有异步操作,第二次执行用于渲染最终的页面。就目前而言renderToString在服务端存在较大的性能瓶颈,它是同步的。如果页面比较复杂,两次渲染效率简直无法忍受。

我最初打算对渲染器进行简化,但是我发现这个方向是无用功,renderToString 已经非常精简、非常快了,尤其是开启了production。对渲染器进行简化带来的性能提升几乎可以忽略不计,因为渲染器的主要消耗在于遍历组件树

但是我们的目的只是为了触发组件中的异步操作, 这些异步操作主要位于container中,即组件树的顶层,再往下遍历就是 浪费了。所以react-mounter使用一个类似于shouldComponentUpdateshouldOmitChildren方法,告诉渲染器 不需要往下遍历了。

Installing

npm i lg-react-mounter

Usage

define Your Container

class MyContainer extends React.PureComponent {
  componentWillMount () {
    // async actions
    this.props.dispatch(getList())
  }
  shouldOmitChildren () {
    // pretty simple
    return true
  }
  // or
  // shouldOmitChildren = true
  render () {
    // if shouldOmitChildren return true, render method will not be called
    // ...
  }
}

Server-side rendering

import ReactMounter from 'react-mounter'
async function render (store, App) {
  const Component = (<App store={store} />)
  // watch ACTIONS
  store.runSaga(saga)

  // trigger all async actions
  ReactMounter.render(Component)

  // stop watch ACTIONS immediately
  store.end()

  // wait all async actions done
  await store.done

  return renderToString(Component)
}

example

lg-react-boilerplate