JavaScript Dynamic / Live Column Charts & Graphs

Download JavaScript Chart Samples

Example of JavaScript Dynamic Chart that constantly updates with live data. Column Chart, like any other chart in CanvasJS, supports updating of data in real-time. Dynamic Charts are also popularly called as Live or Real-Time Charts. Given example shows Real-Time temperature of different boilers using Column Chart. It also contains HTML / JavaScript source code that you can edit in-browser or save to run locally.

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window.onload = function () {

var chart = new CanvasJS.Chart("chartContainer", {
	title: {
		text: "Temperature of Each Boiler"
	},
	axisY: {
		title: "Temperature (°C)",
		includeZero: true,
		suffix: " °C"
	},
	data: [{
		type: "column",	
		yValueFormatString: "#,### °C",
		indexLabel: "{y}",
		dataPoints: [
			{ label: "boiler1", y: 206 },
			{ label: "boiler2", y: 163 },
			{ label: "boiler3", y: 154 },
			{ label: "boiler4", y: 176 },
			{ label: "boiler5", y: 184 },
			{ label: "boiler6", y: 122 }
		]
	}]
});

function updateChart() {
	var boilerColor, deltaY, yVal;
	var dps = chart.options.data[0].dataPoints;
	for (var i = 0; i < dps.length; i++) {
		deltaY = Math.round(2 + Math.random() *(-2-2));
		yVal = deltaY + dps[i].y > 0 ? dps[i].y + deltaY : 0;
		boilerColor = yVal > 200 ? "#FF2500" : yVal >= 170 ? "#FF6000" : yVal < 170 ? "#6B8E23 " : null;
		dps[i] = {label: "Boiler "+(i+1) , y: yVal, color: boilerColor};
	}
	chart.options.data[0].dataPoints = dps; 
	chart.render();
};
updateChart();

setInterval(function() {updateChart()}, 500);

}

Chart Customizations

The color of the columns can be changed using color property. Other commonly used customization options are fillOpacity, indexLabel, etc.