helgasoft commented on issue #20588:
URL: https://github.com/apache/echarts/issues/20588#issuecomment-2547003406
Let first say/confirm that _emphasis_ works on a **static** line chart
tooltip - example in #20584.
Here, on a **dynamic** line, the tooltip emphasis works only after moving
the mouse. When mouse is motionless and points are added, the X-axis changes,
and we see the _tooltip.trigger:'axis'_ doing its job by updating tooltip
content. But line point _emphasis_ is **not activated for the new tooltip**. So
I would venture to call it a bug.
It could be fixed in two ways:
* Add an explanation in **API**: "Tooltip changes series emphasis on
_mouseover_ only."
* Or update **code** to activate series' emphasis when tooltip **content**
changes.
OTOH, I do not understand how this dynamic tooltip is useful, especially
when data is updated every half-second...
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