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JavaScript Charts & Graphs with Null or Empty Data

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Often there are cases where some values are missing in the data series. Such values are known as null or empty data. The given example shows a JavaScript area graph with a missing/null value. It also includes HTML / JavaScript source code that you can edit in-browser or save to run the chart locally.

Try Editing The Code

Download Copy JSFiddle
window.onload = function() {

var chart = new CanvasJS.Chart("chartContainer", {
	animationEnabled: true,
	title: {
		text: "Hourly Average CPU Utilization"
	},
	axisX: {
		title: "Time"
	},
	axisY: {
		title: "Percentage",
		suffix: "%",
		includeZero: true
	},
	data: [{
		type: "line",
		name: "CPU Utilization",
		connectNullData: true,
		//nullDataLineDashType: "solid",
		xValueType: "dateTime",
		xValueFormatString: "DD MMM hh:mm TT",
		yValueFormatString: "#,##0.##\"%\"",
		dataPoints: [
			{ x: 1501048673000, y: 35.939 },
			{ x: 1501052273000, y: 40.896 },
			{ x: 1501055873000, y: 56.625 },
			{ x: 1501059473000, y: 26.003 },
			{ x: 1501063073000, y: 20.376 },
			{ x: 1501066673000, y: 19.774 },
			{ x: 1501070273000, y: 23.508 },
			{ x: 1501073873000, y: 18.577 },
			{ x: 1501077473000, y: 15.918 },
			{ x: 1501081073000, y: null }, // Null Data
			{ x: 1501084673000, y: 10.314 },
			{ x: 1501088273000, y: 10.574 },
			{ x: 1501091873000, y: 14.422 },
			{ x: 1501095473000, y: 18.576 },
			{ x: 1501099073000, y: 22.342 },
			{ x: 1501102673000, y: 22.836 },
			{ x: 1501106273000, y: 23.220 },
			{ x: 1501109873000, y: 23.594 },
			{ x: 1501113473000, y: 24.596 },
			{ x: 1501117073000, y: 31.947 },
			{ x: 1501120673000, y: 31.142 }
		]
	}]
});
chart.render();

}                                

Chart Customizations

You can connect non-null adjacent dataPoints to show continuity in area or line chart using connectNullData property. The null-data line can further be customized using nullDataLineDashType. Some other customizations include color, fillOpacity, markerType, etc.

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