How to solve the problem that the second X-axis label in ECharts dual X-axis chart is not displayed?

In ECharts dual X-axis charts, the second X-axis label sometimes fails to display, and this article will provide a solution.

Problem: When creating a dual X-axis chart using ECharts, the label for the second X-axis may be missing, showing only the axis.

Workaround: This problem usually stems from the missing xAxisIndex property in series configuration. You need to specify which data series corresponds to which X-axis in the series data.

Original configuration example:

 xaxis: [{
    name: '1',
    min: starttime,
    scale: true,
    axisline: {
        show: true,
        linestyle: {
          color: colors[2]
        }
      },
    axislabel: {
      backgroundcolor: 'red',
      formatter: '{value} ml'
    }
  }, {
    name: '2',
    axisline: {
        show: true,
        linestyle: {
          color: colors[2]
        }
      },
    min: starttime,
    scale: true,
    axislabel: {
      backgroundcolor: 'red',
      inside: true,
      show: true,
      hideoverlap: true
    }
  }],

Modified series configuration:

 series: [
    {
      type: 'custom',
      renderItem: renderItem,
      itemStyle: {
        opacity: 0.8
      },
      encode: {
        x: [1, 2],
        y: 0
      },
      data: data,
      xAxisIndex: 0 //Explanatory specifying the use of the first x-axis},
    {
      type: 'custom',
      renderItem: renderItem,
      itemStyle: {
        opacity: 0.8
      },
      encode: {
        x: [1, 2],
        y: 0
      },
      data: data,
      xAxisIndex: 1 //Explanatory specifying the use of the second x-axis}
  ]

By adding xAxisIndex (0 for the first X axis and 1 for the second X axis) to each series object, we explicitly specify the correspondence between the data and the X axis, ensuring that the labels of the second X axis are displayed correctly. Note that this requires setting xAxisIndex for each series. If there is a more optimized code method, please feel free to submit it.

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