Re: [I] Display the nearest data of different series in one tooltip. [echarts]

["Montinew (via GitHub)" <gi...@apache.org>]

Montinew commented on issue #15488:
URL: https://github.com/apache/echarts/issues/15488#issuecomment-3648204171

   I found a practical workaround that works reliably for me.
   
   **Problem:**
   With asynchronous time series (timestamps differ slightly), tooltip aggregation fails because exact x-value alignment is required.
   
   **Workaround:**
   Bind each series to its own `time` xAxis and enable `tooltip.smartFormatter`.
   smartFormatter allows the tooltip to display a single, consolidated timestamp instead of showing a separate timestamp per series.
   Additional xAxes can be hidden.
   
   ```
   {
     "tooltip": { "smartFormatter": true },
     "xAxis": [
       { "type": "time" },
       { "type": "time", "show": false },
       { "type": "time", "show": false }
     ],
     "yAxis": { "type": "value" },
     "series": [
       { "name": "Series 1", "type": "line", "xAxisIndex": 0, "data": [[t1, v1]] },
       { "name": "Series 2", "type": "line", "xAxisIndex": 1, "data": [[t2, v2]] },
       { "name": "Series 3", "type": "line", "xAxisIndex": 2, "data": [[t3, v3]] }
     ]
   }
   ```
   <img width="1462" height="662" alt="Image" src="https://github.com/user-attachments/assets/6400009a-75ec-4515-9751-4c3ffff35b8e" />
   


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