react中封装Echarts

下载

npx create-react-app my-echarts

创建公共组件

import React, { useState, useEffect,useMemo } from 'react';
import * as echarts from "echarts";


const EChartsComponent = ({ option }) => {
  const [echartsInstance, setEchartsInstance] = useState(null);

  useEffect(() => {
    if (!echartsInstance) {
      // 基于准备好的dom，初始化echarts实例 
      const echartsDom = document.getElementById('myChart');
      const instance = echarts.init(echartsDom);
      setEchartsInstance(instance);
    }

    // 监听窗口大小变化
    window.onresize = () => {
      if (echartsInstance) {
        echartsInstance.resize(); 
      }
    };


    // 清理函数
    return () => {
      window.onresize = null;
      if (echartsInstance) {
        echartsInstance.dispose();
      }
    };
  }, [echartsInstance]);

  let Each=useMemo(() => {
    if (echartsInstance) { 
        echartsInstance.setOption(option);
    }
  }, [echartsInstance]);

  return <div id="myChart" style={{ width: '600px', height: '400px' }} />;
};

export default EChartsComponent;

父组件调用

import React from 'react';
import Eachex from './components/Eachex'

const App = () => {
  const option = {
    title: {
      text: '折线图'
    },
    tooltip: {
      trigger: 'none'
    },
    legend: {
      data: ['Email', 'Union Ads', 'Video Ads', 'Direct', 'Search Engine'],
      icon:'circle',
      itemwidth:10,//legend图标宽度
      itemHeight:10 // legend图标高度
    },
    grid: {
      left: '3%',
      right: '4%',
      bottom: '3%',
      containLabel: true
    }, 
    toolbox: {
      feature: {
        saveAsImage: {}
      }
    },
    xAxis: {
      type: 'category',
      boundaryGap: false,
      data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
    },
    yAxis: {
      type: 'value'
    },
    series: [
      {
        name: 'Email',
        type: 'line',
        stack: 'Total',
        data: [120, 132, 101, 134, 90, 230, 210]
      },
      {
        name: 'Union Ads',
        type: 'line',
        stack: 'Total',
        data: [220, 182, 191, 234, 290, 330, 310]
      },
      {
        name: 'Video Ads',
        type: 'line',
        stack: 'Total',
        data: [150, 232, 201, 154, 190, 330, 410]
      },
      {
        name: 'Direct',
        type: 'line',
        stack: 'Total',
        data: [320, 332, 301, 334, 390, 330, 320]
      },
      {
        name: 'Search Engine',
        type: 'line',
        stack: 'Total',
        data: [820, 932, 901, 934, 1290, 1330, 1320]
      }
    ]
  };


  return (
    <div>
      <h1>React 函数组件 + ECharts 示例</h1>
      <Eachex option={option} />
    </div>
  );
};

export default App;

title
标题组件，包含主标题和副标题。

legend
图例组件。
图例组件展现了不同系列的标记(symbol)，颜色和名字。可以通过点击图例控制哪些系列不显示。

grid
直角坐标系内绘图网格，单个 grid 内最多可以放置上下两个 X 轴，左右两个 Y 轴。可以在网格上绘制折线图，柱状图，散点图（气泡图）。