React项目搭建与Echars工具使用

一、React项目快速搭建

1、新建文件夹

2、直接在对应目录输入 cmd ，打开终端

3、执行指令完成React应用建立

npx create-react-app react_echarts_demo

cd react_echarts_demo
npm start

二、React项目结构和分析

• 终端对应目录下输入 code . 打开 vs code

1、删除多于文件，使得结构清晰

2、删除剩余文件中多于的引用内容

3、使用vs code打开终端，运行项目

三、Echarts工具使用

1、npm安装依赖

npm install echarts --save
npm install --save echarts-for-react

2、简单折线图 使用 echarts-for-react

• 引用代码

import React from 'react';
import ReactDOM from 'react-dom/client';
import LineCharts  from './LineCharts';

const root = ReactDOM.createRoot(document.getElementById('root'));

root.render(
  <div> 
    <h1> 简单折线图</h1>
    <LineCharts></LineCharts>
  </div>
);

• 组件代码

import React, {Component} from 'react';
import ReactECharts from 'echarts-for-react';


// 在此组件中绘制一个简单的折线图
export default class LineCharts  extends Component{
  // 返回折线图的配置对象
  option = {
    xAxis: {
      type: 'category',
      data: ['A', 'B', 'C']
    },
    yAxis: {
      type: 'value'
    },
    series: [
      {
        data: [120, 200, 150],
        type: 'line'
      }
    ]
  };

  render() {
    return(
      <div>
        <ReactECharts option={this.option} />
      </div>
    )
  }
}

3、燃尽图 使用echarts

• 代码如下：

index.js

import React from 'react';
import ReactDOM from 'react-dom/client';
import LineEChartsDemo  from './LineEchartsDemo';

const root = ReactDOM.createRoot(document.getElementById('root'));

root.render(
  <div> 
    <h1>燃尽图</h1>
    <LineEChartsDemo></LineEChartsDemo>
  </div>
);

LineEchartsDemo.jsx

import React, { Component } from 'react'
import LineECharts from './LineECharts'


class LineEchartsDemo extends Component{

  constructor(props) {
    super(props)
    this.state = {
	    data: {
	      x: ['2023-03-18', '2023-03-19', '2023-03-20', '2023-03-22', '2023-03-23', '2023-03-24', '2023-03-25'],
	      y: [100, 93, 80, 70, 53, 36, 0]
	    }
    }
  }
  componentDidMount() { }
  render() {
     	return (<LineECharts data={this.state.data} yname="进度/%" />  )
  }
}

export default LineEchartsDemo 

LineECharts.jsx

import React, {Component} from 'react';

import * as echarts from 'echarts';


export default class LineECharts  extends Component{
  constructor(props) {
    super(props)
    this.state = {
    }
  }

  // 挂载完成之后，因为React初始化echarts时长宽可能会获取到顶层，所以延迟200去生成，不影响视觉效果
  componentDidMount() {
    setTimeout(() => {
      this.initEchart(this.props.data)
    }, 200)
  }

  // 更新props以后调用
  componentWillReceiveProps(newProps) {
    this.initEchart(newProps.data)
  }

  initEchart = (data) => {
    let myEcharts = echarts.init(this.echartsBox)
    let option = {
      
      title: {
        text: this.props.title || '',
        left: 'center',
        top: '0'
      },
      tooltip: {
        show: true,
        trigger: 'axis',
        
        formatter: '{b}<br/>进度：{c}%',
        extraCssText: 'box-shadow: 0 0 3px rgba(0, 0, 0, 0.3);'
      },
      xAxis: {
        type: 'category',
        data: data.x,  
      },
      yAxis: {
        name: this.props.yname,
        nameGap: 15,
        position: 'left',
        axisLabel: {
          formatter: '{value}'
        }
      },
      series: [{
        name: '汇总',
        type: 'line',
        data: data.y,
        smooth: false,
        lineStyle: {
          color: '#00CC99',
          width: 2
        },
      
      }]
    }
    myEcharts.setOption(option)
    myEcharts.on('finished', () => {
      myEcharts.resize()
    })
  }

  render() {
    return (
      <div ref={(c) => { this.echartsBox = c }} style={{ width: '500px', height: '500px' }} />
    )
  }
}

4、不同的图形，Echarts官网找对应Option内容复制即可

option = {
  xAxis: {
    data: ['A', 'B', 'C', 'D', 'E']
  },
  yAxis: {},
  series: [
    {
      data: [10, 22, 28, 43, 49],
      type: 'line',
      stack: 'x'
    },
    {
      data: [5, 4, 3, 5, 10],
      type: 'line',
      stack: 'x'
    }
  ]
};