waterWang opened a new pull request, #21727:
URL: https://github.com/apache/echarts/pull/21727
fix #21725
## Problem
`getInitialData()` and `getBaseAxis()` in `WhiskerBoxCommonMixin` (used by
candlestick and boxplot series) were hardcoded to use
`ecModel.getComponent(mainType, this.get('xAxisIndex'))`. When a series
specifies `xAxisId`/`yAxisId` instead of `xAxisIndex`/`yAxisIndex`,
`this.get('xAxisIndex')` returns `undefined`, causing `ecModel.getComponent` to
fall back to the first axis component. This leads to incorrect axis resolution
in multi-grid layouts.
## Fix
Replace `ecModel.getComponent` with `this.getReferringComponents(mainType,
SINGLE_REFERRING)` which properly handles both `xAxisIndex`/`xAxisId` (and
`yAxisIndex`/`yAxisId`). Falls back to the first axis when neither is
specified, preserving backward compatibility.
## Test
New unit test `whiskerBoxCommon.test.ts`:
- Verifies that each series in a multi-grid config gets the correct base
axis when using `xAxisId`
- Verifies backward compatibility (no index/id → first axis)
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