@xmanhattan,

You can pass the desired variables to $points as key value pairs to create an associative array as shown below –

$points = array( "label" => $seqnum, "x" => $seqnum, "y" => $daysdiff, "currdate" => $currdate, "prevdate" => $prevdate, "freq" => $freq );

The same variables would be available within the chart and can be accessed through the chart options –

chart.options.data[0].dataPoints[0].freq

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Indranil Singh Deo
Team CanvasJS