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: [{
  dataPoints: [
   { x: 10, y: 10,  indexLabel: "label1", indexLabelOrientation: "vertical" },

   ],
  },

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