Unable to display tip when mouse is anywhere on chart - d3.js

I am trying to display tip when mouse is anywhere on the graph which will look like below( see India Total Cases) :
I tried this solution but it gives me an error:
slider_chart.html:962 Uncaught TypeError: child._hideDot is not a function
at SVGCircleElement.<anonymous> (slider_chart.html:962)
at Pt.each (d3.v5.min.js:2)
at slider_chart.html:952
at Array.forEach (<anonymous>)
at SVGSVGElement.<anonymous> (slider_chart.html:951)
at SVGSVGElement.<anonymous> (d3.v5.min.js:2)
Line no 935-983:
https://blockbuilder.org/ninjakx/241d14a27427dd89133e1b07919ee9b6
I am trying to implement it for 1st graph then will do the same for rest of the graphs but I am getting this error not a function. I tried searching on google but could not find any solution for it.
My 1st chart (total_chart) is defined under function total_cases_chart() Line no. 863-983.

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