feat(ui): Create and use element id for ECharts when using tooltip.appendToBody
#88735
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ECharts has a tooltip option (
appendToBody
) to append the tooltip todocument.body
. This is useful when the charts has a parent container that has e.g.overflow: hidden
so that the tooltip does not get cutoff. However we have a custom tooltip positioning function that requires a element id to get a reference of the chart (or its container) to properly position the tooltip. If we useappendToBody
without anid
, the tooltip does not get displayed near the mouse cursor and instead it's confined within the bounds of the chart.Before
The crosshairs is where the mouse is (above series both both screenshots)


Here the tooltip is not near the series or the mouse
After
Notice the tooltips are near the crosshairs

