Detailed explanation of Javascript Echarts air quality map effect

We need to first combine the air quality data with the map data:

Map data has the attribute name

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Our different cities' air quality also has a name attribute. These two attributes are the same, both called name, so we can associate them:

var airData = [
      { name: 'Beijing', value: 39.92 },
      { name: 'Tianjin', value: 39.13 },
      { name: 'Shanghai', value: 31.22 },
      { name: 'Chongqing', value: 66 },
      { name: 'Hebei', value: 147 },
      { name: 'Henan', value: 113 },
      { name: 'Yunnan', value: 25.04 },
      { name: 'Liaoning', value: 50 },
      { name: 'Heilongjiang', value: 114 },
      { name: 'Hunan', value: 175 },
      { name: 'Anhui', value: 117 },
      { name: 'Shandong', value: 92 },
      { name: 'Xinjiang', value: 84 },
      { name: 'Jiangsu', value: 67 },
      { name: 'Zhejiang', value: 84 },
      { name: 'Jiangxi', value: 96 },
      { name: 'Hubei', value: 273 },
      { name: 'Guangxi', value: 59 },
      { name: 'Gansu', value: 99 },
      { name: 'Shanxi', value: 39 },
      { name: 'Inner Mongolia', value: 58 },
      { name: 'Shaanxi', value: 61 },
      { name: 'Jilin', value: 51 },
      { name: 'Fujian', value: 29 },
      { name: 'Guizhou', value: 71 },
      { name: 'Guangdong', value: 38 },
      { name: 'Qinghai', value: 57 },
      { name: 'Tibet', value: 24 },
      { name: 'Sichuan', value: 58 },
      { name: 'Ningxia', value: 52 },
      { name: 'Hainan', value: 54 },
      { name: 'Taiwan', value: 88 },
      { name: 'Hong Kong', value: 66 },
      { name: 'Macao', value: 77 },
      { name: 'South China Sea Islands', value: 55 }
    ]

Next we need to configure the air quality data into the series:

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Finally, do some effect configuration:

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Full code:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Map-Air Quality in Different Cities</title>
  <script src="./lib/echarts.js"></script>
  <script src="./lib/axios.js"></script>
</head>
<body>
  <div style="width: 600px; height: 400px;border: 1px solid lightblue;"></div>
  <script>
    var airData = [
      { name: 'Beijing', value: 39.92 },
      { name: 'Tianjin', value: 39.13 },
      { name: 'Shanghai', value: 31.22 },
      { name: 'Chongqing', value: 66 },
      { name: 'Hebei', value: 147 },
      { name: 'Henan', value: 113 },
      { name: 'Yunnan', value: 25.04 },
      { name: 'Liaoning', value: 50 },
      { name: 'Heilongjiang', value: 114 },
      { name: 'Hunan', value: 175 },
      { name: 'Anhui', value: 117 },
      { name: 'Shandong', value: 92 },
      { name: 'Xinjiang', value: 84 },
      { name: 'Jiangsu', value: 67 },
      { name: 'Zhejiang', value: 84 },
      { name: 'Jiangxi', value: 96 },
      { name: 'Hubei', value: 273 },
      { name: 'Guangxi', value: 59 },
      { name: 'Gansu', value: 99 },
      { name: 'Shanxi', value: 39 },
      { name: 'Inner Mongolia', value: 58 },
      { name: 'Shaanxi', value: 61 },
      { name: 'Jilin', value: 51 },
      { name: 'Fujian', value: 29 },
      { name: 'Guizhou', value: 71 },
      { name: 'Guangdong', value: 38 },
      { name: 'Qinghai', value: 57 },
      { name: 'Tibet', value: 24 },
      { name: 'Sichuan', value: 58 },
      { name: 'Ningxia', value: 52 },
      { name: 'Hainan', value: 54 },
      { name: 'Taiwan', value: 88 },
      { name: 'Hong Kong', value: 66 },
      { name: 'Macao', value: 77 },
      { name: 'South China Sea Islands', value: 55 }
    ]
    var myCharts = echarts.init(document.querySelector('div'))
    
    axios.get('./json/map/china.json').then(res => {
      console.log(res.data)
      echarts.registerMap('china', res.data)
      var option = {
        geo: {
          type: 'map',
          map: 'china',
          roam: true,
          label: {
            show: true
          }
        },
        series: [
          {
            data: airData, // air quality data geoIndex: 0, // associate air quality data with the 0th geo configuration type: 'map'
          }
        ],
        visualMap:
          min: 0, // minimum value max: 300, // maximum value inRange: {
            color: ['pink', 'blue'] // Control the lower left corner and map gradient color},
          calculable: true // Control the lower left slider}
      }
      myCharts.setOption(option)
    })
  </script>
</body>
</html>

Summarize

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