indexLabelOrientation: String

Sets the Orientation of indexLabel to “horizontal” or “vertical”.

• Doesn’t work with pie, doughnut, funnel and pyramid charts.

var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 data:[{
 indexLabelOrientation: "vertical",

  },
 ]
 .
 .
});
chart.render();