javascript - Why stacked bar chart bars is unable to filter the pie chart? -

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here trying build 2 graphs

stacked barchart : years spent on language (up 3years 1 stack ,5 , above stack)

pie chart :years of experience. getting charts fine .but when click on bars in stacked bar chart pie chart not filtering.but pie able filter stacked bar chart

sample data: 

{  years of exp : 1,     courses_taken: [        {              language : " sap bi 7.0",              spent : 5.0,                  },        {              spent : 5.5,              language : " sap ecc 6.0"       }   ]}

any suggestions. why bar chart unable filter pie? code here


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