Detailed explanation of how to install and reference ECharts in WeChat applet?

This article will introduce to you how to use npm to introduce ECharts into WeChat applet. I hope it will be helpful to you!

Apache ECharts officially provides code examples and ec-canvas components for using Echarts in WeChat mini programs, but it has not Publish the npm package.

This project is modified on top of the official code to support ec-canvas The component is passed in echarts to support npm Introduction echarts Or echarts after local customization, which is more in line with Web development experience.

And publish the npm package to support the installation and use of small programs through npm. And supports Taro to introduce echarts on demand to reduce the packaging size. [Related learning recommendations: 小 program development tutorial]

Installation

npm install echarts-for-weixin

小program reference

Reference codetools/demo

1. First, add the usingComponents configuration field to the json file of the page

{
  "usingComponents": {
    "ec-canvas": "echarts-for-weixin"
  }
}

2. Create the project root directory package.json and execute npm install to install dependencies

{
  "dependencies": {
    "echarts": "^5.1.2",
    "echarts-for-weixin": "^1.0.0"
  }
}

3. Build npm in the mini program developer tools

Click the menu bar in the developer tools: Tools--> Build npm

4. Introduce echarts into the page, you can introduce echarts from npm, or you can introduce local custom built echarts to reduce Volume

import * as echarts from 'echarts' // 从 npm 引入 echarts
import * as echarts from './echarts' // 或者从本地引入自定义构建的 echarts

5. Then you can use the component directly in the wxml of the corresponding page

<view class="container">
  <ec-canvas id="mychart-dom-bar" canvas-id="mychart-bar" echarts="{{ echarts }}" ec="{{ ec }}"></ec-canvas>
</view>

6. For the specific usage of ec-canvas and how to initialize the chart, please refer toEcharts Official Mini Program Example

import * as echarts from 'echarts'

let chart = null;

function initChart(canvas, width, height, dpr) {
  chart = echarts.init(canvas, null, {
    width: width,
    height: height,
    devicePixelRatio: dpr // new
  });
  canvas.setChart(chart);

  var option = {
    tooltip: {
      trigger: 'axis',
      axisPointer: {            // 坐标轴指示器，坐标轴触发有效
        type: 'shadow'        // 默认为直线，可选为：'line' | 'shadow'
      },
      confine: true
    },
    legend: {
      data: ['热度', '正面', '负面']
    },
    grid: {
      left: 20,
      right: 20,
      bottom: 15,
      top: 40,
      containLabel: true
    },
    xAxis: [
      {
        type: 'value',
        axisLine: {
          lineStyle: {
            color: '#999'
          }
        },
        axisLabel: {
          color: '#666'
        }
      }
    ],
    yAxis: [
      {
        type: 'category',
        axisTick: { show: false },
        data: ['汽车之家', '今日头条', '百度贴吧', '一点资讯', '微信', '微博', '知乎'],
        axisLine: {
          lineStyle: {
            color: '#999'
          }
        },
        axisLabel: {
          color: '#666'
        }
      }
    ],
    series: [
      {
        name: '热度',
        type: 'bar',
        label: {
          normal: {
            show: true,
            position: 'inside'
          }
        },
        data: [300, 270, 340, 344, 300, 320, 310],
        itemStyle: {
          // emphasis: {
          //   color: '#37a2da'
          // }
        }
      },
      {
        name: '正面',
        type: 'bar',
        stack: '总量',
        label: {
          normal: {
            show: true
          }
        },
        data: [120, 102, 141, 174, 190, 250, 220],
        itemStyle: {
          // emphasis: {
          //   color: '#32c5e9'
          // }
        }
      },
      {
        name: '负面',
        type: 'bar',
        stack: '总量',
        label: {
          normal: {
            show: true,
            position: 'left'
          }
        },
        data: [-20, -32, -21, -34, -90, -130, -110],
        itemStyle: {
          // emphasis: {
          //   color: '#67e0e3'
          // }
        }
      }
    ]
  };

  chart.setOption(option);
  return chart;
}

Page({
  data: {
    echarts,
    ec: {
      onInit: initChart
    }
  },
  onReady() {
    setTimeout(function () {
      // 获取 chart 实例的方式
      console.log(chart)
    }, 2000);
  }
})

Taro Reference

Reference Codeexamples/taro

Preparation

1. Installation dependencies

npm install echarts-for-weixin

2. Create a new file in the project root directoryproject.package.json Or customize the name. This file is the applet package.json, and add the applet to customize the npm build method in the next step. The purpose of this is to be able to share the projectnode_modules

project.package.json

{
  "dependencies": {
    "echarts": "^5.1.2",
    "echarts-for-weixin": "^1.0.2"
  }
}

3. at Add a small program to customize the npm building method in setting of project.config, refer to Customizing the node_modules and miniprogram_npm locations for building npm method

{
  "setting": {
    "packNpmManually": true,
    "packNpmRelationList": [
      {
        "packageJsonPath": "../project.package.json",
        "miniprogramNpmDistDir": "./"
      }
    ]
  }
}

4. Execute the development or packaging commands of Taro for project development

npm run dev:weapp

5. Build npm in the applet developer tool. Note: The project directory opened by the mini program development tool is the dist folder

Click the menu bar in the developer tools: Tools--> Build npm

Introduce Echarts

1. Add it to the global app.config.js or use it individually if you need echarts Add the reference component

{
  "usingComponents": {
    "ec-canvas": "echarts-for-weixin"
  }
}

2. to the page configuration and introduce echarts into the page. You can introduce echarts from npm, You can also introduce local custom built echarts to reduce the size

import * as echarts from 'echarts' // 从 npm 引入 echarts
import * as echarts from './echarts' // 或者从本地引入自定义构建的 echarts

3. Pass the introduced echarts to the component

<ec-canvas 
  id=&#39;mychart-dom-area&#39; 
  canvas-id=&#39;mychart-area&#39; 
  echarts={echarts} // 将引入的 echarts 传给组件
  ec={this.state.ec}
/>

4. ec-canvas For specific usage and how to initialize the chart, please refer to Echarts official applet example

Example Code

function initChart(canvas, width, height) {  const chart = echarts.init(canvas, null, {    width: width,    height: height
  })
  canvas.setChart(chart)  const model = {    yCates: ['Saturday', 'Friday', 'Thursday',      'Wednesday', 'Tuesday', 'Monday',      'Sunday'],    xCates: ['1', '2', '3', '4', '5'],    data: [      // [yCateIndex, xCateIndex, value]
      [0, 0, 5], [0, 1, 7], [0, 2, 3], [0, 3, 5], [0, 4, 2],
      [1, 0, 1], [1, 1, 2], [1, 2, 4], [1, 3, 8], [1, 4, 2],
      [2, 0, 2], [2, 1, 3], [2, 2, 8], [2, 3, 6], [2, 4, 7],
      [3, 0, 3], [3, 1, 7], [3, 2, 5], [3, 3, 1], [3, 4, 6],
      [4, 0, 3], [4, 1, 2], [4, 2, 7], [4, 3, 8], [4, 4, 9],
      [5, 0, 2], [5, 1, 2], [5, 2, 3], [5, 3, 4], [5, 4, 7],
      [6, 0, 6], [6, 1, 5], [6, 2, 3], [6, 3, 1], [6, 4, 2]
    ]
  }  const data = model.data.map(function (item) {    return [item[1], item[0], item[2] || '-']
  })  const option = {    tooltip: {      position: 'top'
    },    animation: false,    grid: {      bottom: 60,      top: 10,      left: 80
    },    xAxis: {      type: 'category',      data: model.xCates
    },    yAxis: {      type: 'category',      data: model.yCates
    },    visualMap: {      min: 1,      max: 10,      show: false,      calculable: true,      orient: 'horizontal',      left: 'center',      bottom: 10,      inRange: {        color: ['#37A2DA', '#32C5E9', '#67E0E3', '#91F2DE', '#FFDB5C', '#FF9F7F'],
      }
    },    series: [{      name: 'Punch Card',      type: 'heatmap',      data: data,      label: {        normal: {          show: true
        }
      },      itemStyle: {        emphasis: {          shadowBlur: 10,          shadowColor: 'rgba(0, 0, 0, 0.5)'
        }
      }
    }]
  }

  chart.setOption(option)  return chart
}export default class Echarts extends React.Component {

  state = {    ec: {      onInit: initChart
    }
  }

  render () {    return (      <View className=&#39;echarts&#39;>        <ec-canvas 
          id=&#39;mychart-dom-area&#39; 
          canvas-id=&#39;mychart-area&#39; 
          echarts={echarts} 
          ec={this.state.ec}
        />      </View>
    )
  }
}复制代码

Taro on-demand reference

Reference codeexamples/taro-manual-load

Note: Mini Program Developer Tools are open The project directory is the packaged dist directory

Preparation work

1. Install dependencies

npm install echarts-for-weixin

2、在项目根目录中新建文件 project.package.json 或者自定义命名，此文件是小程序的 package.json，并在下一步中添加小程序自定义构建 npm 方式。并配置 config/index.js 中的 copy 选项，将 project.package.json 复制到 dist 目录下并且重命名为 package.json。并且复制 node_modules/echarts-for-weixin 至 dist/node_modules/echarts-for-weixin 避免在小程序开发者工具中打开的项目重新安装依赖

project.package.json

{
  "dependencies": {
    "echarts-for-weixin": "^1.0.2"
  }
}

config/index.js

{
  copy: {
    patterns: [
      { from: 'project.package.json', to: 'dist/package.json' }, // 指定需要 copy 的文件
      { from: 'node_modules/echarts-for-weixin/', to: 'dist/node_modules/echarts-for-weixin/' }
    ],
    options: {}
  }
}

3、在 project.config 的 setting 中添加小程序自定义构建 npm 方式，参考 自定义 node_modules 和 miniprogram_npm 位置的构建 npm 方式

{
  "setting": {
    "packNpmManually": true,
    "packNpmRelationList": [
      {
        "packageJsonPath": "./package.json",
        "miniprogramNpmDistDir": "./"
      }
    ]
  }
}

4、执行 Taro 的开发或者打包命令进行项目开发

npm run dev:weapp

5、小程序开发者工具中构建 npm。注意：小程序开发工具打开的项目目录是 dist 文件夹

点击开发者工具中的菜单栏：工具 --> 构建 npm

引入 Echarts

1、在全局的 app.config.js 中添加或者在单个需要使用到 echarts 的页面配置中添加引用组件

{
  "usingComponents": {
    "ec-canvas": "echarts-for-weixin"
  }
}

2、在页面中引入 echarts/core 和需要的组件，Taro 打包会只打包引入的组件，这样达到按需引入的目的

// Import the echarts core module, which provides the necessary interfaces for using echarts.
import * as echarts from 'echarts/core';
// Import charts, all with Chart suffix
import {
  // LineChart,
  BarChart,
  // PieChart,
  // ScatterChart,
  // RadarChart,
  // MapChart,
  // TreeChart,
  // TreemapChart,
  // GraphChart,
  // GaugeChart,
  // FunnelChart,
  // ParallelChart,
  // SankeyChart,
  // BoxplotChart,
  // CandlestickChart,
  // EffectScatterChart,
  // LinesChart,
  // HeatmapChart,
  // PictorialBarChart,
  // ThemeRiverChart,
  // SunburstChart,
  // CustomChart,
} from 'echarts/charts';
// import components, all suffixed with Component
import {
  // GridSimpleComponent,
  GridComponent,
  // PolarComponent,
  // RadarComponent,
  // GeoComponent,
  // SingleAxisComponent,
  // ParallelComponent,
  // CalendarComponent,
  // GraphicComponent,
  // ToolboxComponent,
  TooltipComponent,
  // AxisPointerComponent,
  // BrushComponent,
  TitleComponent,
  // TimelineComponent,
  // MarkPointComponent,
  // MarkLineComponent,
  // MarkAreaComponent,
  // LegendComponent,
  // LegendScrollComponent,
  // LegendPlainComponent,
  // DataZoomComponent,
  // DataZoomInsideComponent,
  // DataZoomSliderComponent,
  // VisualMapComponent,
  // VisualMapContinuousComponent,
  // VisualMapPiecewiseComponent,
  // AriaComponent,
  // TransformComponent,
  DatasetComponent,
} from 'echarts/components';
// Import renderer, note that introducing the CanvasRenderer or SVGRenderer is a required step
import {
  CanvasRenderer,
  // SVGRenderer,
} from 'echarts/renderers';
// Register the required components
echarts.use(
  [
    TitleComponent,
    TooltipComponent, 
    GridComponent, 
    BarChart, 
    CanvasRenderer, 
    HeatmapChart, 
    VisualMapComponent,
    VisualMapContinuousComponent,
    VisualMapPiecewiseComponent,
  ]
);

3、将引入的 echarts 传给组件

<ec-canvas 
  id=&#39;mychart-dom-area&#39; 
  canvas-id=&#39;mychart-area&#39; 
  echarts={echarts} // 将引入的 echarts 传给组件
  ec={this.state.ec}
/>

4、ec-canvas 的具体用法和如何初始化图表请参考 Echarts 官方小程序示例

function initChart(canvas, width, height) {
  const chart = echarts.init(canvas, null, {
    width: width,
    height: height
  })
  canvas.setChart(chart)
  const model = {
    yCates: ['Saturday', 'Friday', 'Thursday',
      'Wednesday', 'Tuesday', 'Monday',
      'Sunday'],
    xCates: ['1', '2', '3', '4', '5'],
    data: [
      // [yCateIndex, xCateIndex, value]
      [0, 0, 5], [0, 1, 7], [0, 2, 3], [0, 3, 5], [0, 4, 2],
      [1, 0, 1], [1, 1, 2], [1, 2, 4], [1, 3, 8], [1, 4, 2],
      [2, 0, 2], [2, 1, 3], [2, 2, 8], [2, 3, 6], [2, 4, 7],
      [3, 0, 3], [3, 1, 7], [3, 2, 5], [3, 3, 1], [3, 4, 6],
      [4, 0, 3], [4, 1, 2], [4, 2, 7], [4, 3, 8], [4, 4, 9],
      [5, 0, 2], [5, 1, 2], [5, 2, 3], [5, 3, 4], [5, 4, 7],
      [6, 0, 6], [6, 1, 5], [6, 2, 3], [6, 3, 1], [6, 4, 2]
    ]
  }

  const data = model.data.map(function (item) {
    return [item[1], item[0], item[2] || '-']
  })

  const option = {
    tooltip: {
      position: 'top'
    },
    animation: false,
    grid: {
      bottom: 60,
      top: 10,
      left: 80
    },
    xAxis: {
      type: 'category',
      data: model.xCates
    },
    yAxis: {
      type: 'category',
      data: model.yCates
    },
    visualMap: {
      min: 1,
      max: 10,
      show: false,
      calculable: true,
      orient: 'horizontal',
      left: 'center',
      bottom: 10,
      inRange: {
        color: ['#37A2DA', '#32C5E9', '#67E0E3', '#91F2DE', '#FFDB5C', '#FF9F7F'],
      }
    },
    series: [{
      name: 'Punch Card',
      type: 'heatmap',
      data: data,
      label: {
        normal: {
          show: true
        }
      },
      itemStyle: {
        emphasis: {
          shadowBlur: 10,
          shadowColor: 'rgba(0, 0, 0, 0.5)'
        }
      }
    }]
  }

  chart.setOption(option)
  return chart
}

export default class Echarts extends React.Component {

  state = {
    ec: {
      onInit: initChart
    }
  }

  render () {
    return (
      <View className=&#39;echarts&#39;>
        <ec-canvas 
          id=&#39;mychart-dom-area&#39; 
          canvas-id=&#39;mychart-area&#39; 
          echarts={echarts} 
          ec={this.state.ec}
        />
      </View>
    )
  }
}

5、可以查看小程序开发者工具中的依赖分析，确定文件大小以及是否正确按需引入

更多编程相关知识，请访问：编程入门！！

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