How to have line labels on both sides of a Y-axis?

Question

I would like to have line labels on both sides of a Y-axis, as in the following example: I looked on ECharts examples and documentation, but I couldn't find which series type or options would allow me to do that...

Here are the data used in the example:

|------------+--------+--------+--------+--------+-------+--------+--------+--------|
| Entity     | 1950.0 | 1960.0 | 1970.0 | 1980.0 |  1990 | Rank50 | Rank90 | Factor |
|------------+--------+--------+--------+--------+-------+--------+--------+--------|
| Mitzerland |  30000 |  32000 |  40000 |  50000 | 60000 |      1 |      3 |      2 |
| Ataly      |  20000 |  40200 |  60500 |  72000 | 85000 |      2 |      1 |    4.3 |
| Bangolia   |  10000 |  20100 |  30500 |  42000 | 75000 |      3 |      2 |    7.5 |
|------------+--------+--------+--------+--------+-------+--------+--------+--------|

Answer 1

I dont think there is inbuilt support for that. Best I can think of right now is to use the regular endLabel for the end of the series and a markPoint with symbolSize 0 on top of the first datapoint as start label.

Example:

const dataset = [[150, 230, 224, 218, 135, 147, 260], [230, 160, 70, 135, 147, 140, 110], [135, 147, 260, 340, 290, 110, 90]];
const entity = ['Mangolia', 'Mitzerland','Torsica'];

const seriesList = [];
for (const index in dataset) {
  const row = dataset[index];
  seriesList.push({
    type: 'line',
    name: entity[index],
    data: row,
    endLabel: {
      show: true,
      formatter: () => 'end label = ' + row[row.length - 1]
    },
    markPoint: {
      symbolSize: 0,
      label: {position: 'left'},
      data: [{coord: [0, row[0]], value: entity[index]}]
    }
  });
}

option = {
  legend: {},
  xAxis: {
    type: 'category',
    data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
  },
  yAxis: {
    type: 'value'
  },
  series: seriesList
};

Answer 2

You can use endLabel to show label at end.

Also, to show label at start you can use Markpoint with formatter to show series name and start value.

Example:

Start label

markPoint: {
  symbolSize: 0,
  label: {
    position: 'left', 
    formatter: (params)=> `${params.value} = ${params.data.coord[1]}`
  },
  data: [{coord: [0, row[0]], value: entity[index]}]
}

End label

endLabel: {
  show: true,
  formatter: '{a} = {c}'
},