DataViz index.html: add second event for mouseenter/mouseleave to better show the selected circle
DataViz index.html: add second event for mouseenter/mouseleave to better show the selected circle

Possibly add click event for more info

zhongyuanzhou/FCH808.github.io,FCH808/FCH808.github.io,zhongyuanzhou/FCH808.github.io,FCH808/FCH808.github.io,FCH808/FCH808.github.io,zhongyuanzhou/FCH808.github.io