cluyet opened a new issue #16696:
URL: https://github.com/apache/echarts/issues/16696
### What problem does this feature solve?
When using a custom formatter for the tooltip, the 'params' contains
information about the series, the data, but there is no information about which
dataset is used for the tooltip.
In my case I have multiple datasets, and when I display the tooltip I would
like to show information about the current dataset.
Is it possible to add this information in the 'params' received in the
callback function?
### What does the proposed API look like?
The 'params' would look like this:
`[
{
"componentType": "series",
"componentSubType": "line",
"componentIndex": 1,
"seriesType": "line",
"seriesIndex": 1,
**"datasetIndex": 1, // <---- NEW INFORMATION**
"seriesId": "\u0000Temperature (°C)\u00001",
"seriesName": "Temperature (°C)",
"name": "",
"dataIndex": 12,
"data": [
1647346171000,
25.56,
26.91,
483.52
],
"value": [
1647346171000,
25.56,
26.91,
483.52
],
"color": "#5470c6",
"dimensionNames": [
"x",
"y",
"value",
"value0"
],
"encode": {
"x": [
0
],
"y": [
1
]
},
"$vars": [
"seriesName",
"name",
"value"
],
"axisDim": "x",
"axisIndex": 0,
"axisType": "xAxis.time",
"axisId": "\u0000series\u00000\u00000",
"axisValue": 1647346171000,
"axisValueLabel": "2022-03-15 13:09:31",
"marker": "<span
style=\"display:inline-block;margin-right:4px;border-radius:10px;width:10px;height:10px;background-color:#5470c6;\"></span>"
}
]`
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