当浏览器窗口调整大小时,如何让React重新渲染视图?

背景

我有一些块,我想在页面上单独布局,但我也希望他们更新时,浏览器窗口的变化。最终的结果将是像Ben Holland的Pinterest布局,但使用React而不仅仅是jQuery。我还有一段路要走。

Code

这是我的应用程序:

var MyApp = React.createClass({
  //does the http get from the server
  loadBlocksFromServer: function() {
    $.ajax({
      url: this.props.url,
      dataType: 'json',
      mimeType: 'textPlain',
      success: function(data) {
        this.setState({data: data.events});
      }.bind(this)
    });
  },
  getInitialState: function() {
    return {data: []};
  },
  componentWillMount: function() {
    this.loadBlocksFromServer();

  },    
  render: function() {
    return (
        <div>
      <Blocks data={this.state.data}/>
      </div>
    );
  }
});

React.renderComponent(
  <MyApp url="url_here"/>,
  document.getElementById('view')
)

然后我有Block组件(相当于上面Pinterest例子中的Pin):

var Block = React.createClass({
  render: function() {
    return (
        <div class="dp-block" style={{left: this.props.top, top: this.props.left}}>
        <h2>{this.props.title}</h2>
        <p>{this.props.children}</p>
        </div>
    );
  }
});

和block的列表/集合:

var Blocks = React.createClass({

  render: function() {

    //I've temporarily got code that assigns a random position
    //See inside the function below...

    var blockNodes = this.props.data.map(function (block) {   
      //temporary random position
      var topOffset = Math.random() * $(window).width() + 'px'; 
      var leftOffset = Math.random() * $(window).height() + 'px'; 
      return <Block order={block.id} title={block.summary} left={leftOffset} top={topOffset}>{block.description}</Block>;
    });

    return (
        <div>{blockNodes}</div>
    );
  }
});

问题

我应该添加jQuery的窗口大小调整?如果有,在哪里?

$( window ).resize(function() {
  // re-render the component
});

有没有更“React”的方式来做到这一点?


当前回答

我将跳过上述所有答案,并开始使用反应维度的高阶组件。

https://github.com/digidem/react-dimensions

只需添加一个简单的导入和一个函数调用,就可以在组件中访问this.props.containerWidth和this.props.containerHeight。

// Example using ES6 syntax
import React from 'react'
import Dimensions from 'react-dimensions'

class MyComponent extends React.Component {
  render() (
    <div
      containerWidth={this.props.containerWidth}
      containerHeight={this.props.containerHeight}
    >
    </div>
  )
}

export default Dimensions()(MyComponent) // Enhanced component

其他回答

谢谢大家的回答。这是我的React + Recompose。它是一个高阶函数,包含组件的windowHeight和windowWidth属性。

const withDimensions = compose(
 withStateHandlers(
 ({
   windowHeight,
   windowWidth
 }) => ({
   windowHeight: window.innerHeight,
   windowWidth: window.innerWidth
 }), {
  handleResize: () => () => ({
    windowHeight: window.innerHeight,
    windowWidth: window.innerWidth
  })
 }),
 lifecycle({
   componentDidMount() {
   window.addEventListener('resize', this.props.handleResize);
 },
 componentWillUnmount() {
  window.removeEventListener('resize');
 }})
)

试试这个:

resize = () => this.forceUpdate()

componentDidMount() {
  window.addEventListener('resize', this.resize)
}

componentWillUnmount() {
  window.removeEventListener('resize', this.resize)
}

必须将它绑定到构造函数中的“this”以使其与类语法一起工作

class MyComponent extends React.Component {
  constructor(props) {
    super(props)
    this.resize = this.resize.bind(this)      
  }
  componentDidMount() {
    window.addEventListener('resize', this.resize)
  }
  componentWillUnmount() {
    window.removeEventListener('resize', this.resize)
  }
}

使用React钩子:

你可以定义一个自定义钩子来监听窗口大小调整事件,就像这样:

import React, { useLayoutEffect, useState } from 'react';

function useWindowSize() {
  const [size, setSize] = useState([0, 0]);
  useLayoutEffect(() => {
    function updateSize() {
      setSize([window.innerWidth, window.innerHeight]);
    }
    window.addEventListener('resize', updateSize);
    updateSize();
    return () => window.removeEventListener('resize', updateSize);
  }, []);
  return size;
}

function ShowWindowDimensions(props) {
  const [width, height] = useWindowSize();
  return <span>Window size: {width} x {height}</span>;
}

这里的优点是逻辑是封装的,您可以在任何想要使用窗口大小的地方使用这个Hook。

使用React类:

你可以在componentDidMount中监听,类似于这个组件,它只显示窗口尺寸(如<span>窗口大小:1024 x 768</span>):

import React from 'react';

class ShowWindowDimensions extends React.Component {
  state = { width: 0, height: 0 };
  render() {
    return <span>Window size: {this.state.width} x {this.state.height}</span>;
  }
  updateDimensions = () => {
    this.setState({ width: window.innerWidth, height: window.innerHeight });
  };
  componentDidMount() {
    window.addEventListener('resize', this.updateDimensions);
  }
  componentWillUnmount() {
    window.removeEventListener('resize', this.updateDimensions);
  }
}

从React 16.8开始,你可以使用Hooks!

/* globals window */
import React, { useState, useEffect } from 'react'
import _debounce from 'lodash.debounce'

const Example = () => {
  const [width, setWidth] = useState(window.innerWidth)

  useEffect(() => {
    const handleResize = _debounce(() => setWidth(window.innerWidth), 100)

    window.addEventListener('resize', handleResize);

    return () => {
      window.removeEventListener('resize', handleResize);
    }
  }, [])

  return <>Width: {width}</>
}