Summing Graph Data by Series in Highcharts/Highstocks

How to Sum series in Highcharts & Highstocks

This quick code will do the trick and add a nice sum of all series values in the legend label for each series

Quick explanation of Highcharts legend parameters

labelFormatter : function() { } : called by Highcharts to make legend label, for each item, return the text for the legend builder.
this.yData : contains series data, in a Javascript array. : series label, defined in the series array on your chart definition.

Hope this help

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