Chartjs-How to show 2 populations types in one bar using chartjs?

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You can use the Stacked Bar Chart – the one linked to from the Community Extensions section of the ChartJS site – http://www.chartjs.org/docs/#advanced-usage-community-extensions

With the library and the extension included, you call it just as you would a normal ChartJS chart.

var ctx = document.getElementById("canvas").getContext("2d");
var myBar = new Chart(ctx).StackedBar(barChartData);