tinysimple opened a new issue, #21459:
URL: https://github.com/apache/echarts/issues/21459
### What problem does this feature solve?
Multiple line segments in a line chart cannot be assigned different
numerical units to different line charts using the `tooltip.valueFormatter`
function. At present, the `valueFormatter` function only has two parameters,
`name` and `dataIndex`.
Since it is just a simple requirement, I do not want to rewrite the entire
content and style through `tooltip.formatter` (I do not want to change the
default style).
Upon checking the source code, it was found that the relevant code is
located at line `351` in the file `src/component/tooltip/tooltipMarkup.ts`.
Through breakpoint debugging, I found that the name in the fragment object is
the line segment name in the series. I need this name field to determine what
units should be displayed.
For example:
Add unit A to the current line
Add unit V to the voltage line
### What does the proposed API look like?
Original codeļ¼
`const readableValueList = noValue
? []
: valueFormatter(fragment.value as OptionDataValue,
fragment.dataIndex);`
new code:
`const readableValueList = noValue
? []
: valueFormatter(fragment.value as OptionDataValue,
fragment.dataIndex, fragment.name);`
or
`const readableValueList = noValue
? []
: valueFormatter(fragment.value as OptionDataValue,
fragment.dataIndex, fragment);`
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