plainheart commented on issue #21025:
URL: https://github.com/apache/echarts/issues/21025#issuecomment-2960904268
Like `***Id`/`***Name`/`***Index` in other components,
`legendId`/`legendName`/`legendIndex` is used to explicitly specify the target
legend component when there are **_multiple_** legend components.
`legendId`/`legendName`/`legendIndex` is not equal to
`seriesId`/`seriesName`/`seriesIndex`.
The right usage should be like this:
```js
myChart.dispatchAction({
type: 'legendToggleSelect',
name: 'Legend A', // <-- this is the name of a legend item or a series
legendName: 'legendComponentNameA', // <-- this is the name of a whole
legend component ( NOT EQUAL TO the above 'name')
legendIndex: 'legendComponentIndexA', // <-- this is the index of a whole
legend component,
legendId: 'legendComponentIdA', // <-- this is the id of a whole legend
component,
});
```
You can also see #20129 for the context.
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