nullDataLineDashType: String

Sets the Line Dash Type of line wherever null data is present.

Supported Line Dash Types:

• “solid”
• “shortDash”
• “shortDot”
• “shortDashDot”
• “shortDashDotDot”
• “dot”
• “dash”
• “dashDot”
• “longDash”
• “longDashDot”
• “longDashDotDot”

• Will effect only if connectNullData is set to true.
• Supported with all Line and Area Charts.
• Not Supported on IE8.

var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
  data: [{
   type: "line",
   nullDataLineDashType:  "dot" 
 
  },
 ]
 .
 . 
});
chart.render();