ASP.NET MVC Dynamic / Live Line Charts & Graphs

Download ASP.NET Chart Samples

Dynamic or Live Charts are used for displaying data that varies with time. Use of Line Chart to display real-time graph is very common. The given example shows Line Chart which updates every 3000 milliseconds. It also contains source code that you try running locally.

@{
	Layout = null;
}

<!DOCTYPE HTML>
<html>
<head>
<script>
window.onload = function () {

// Initial Values
var xValue = 0;
var yValue = 10;
var newDataCount = 6;
dataPoints = [];

var chart = new CanvasJS.Chart("chartContainer", {
	theme: "light2",
	title: {
		text: "Live Air Quality Update"
	},
	axisY: {
		suffix: " µg/m3",
	},
	data: [{
		type: "spline",
		yValueFormatString: "#,##0.## µg/m3",
		dataPoints: dataPoints
	}]
});

updateData();

function addData(data) {
	if (newDataCount !== 1) {
		$.each(data, function (key, value) {
			dataPoints.push({ x: value.x, y: parseFloat(value.y) });
			xValue++;
			yValue = parseFloat(value.y);
		});
		newDataCount = 1;
	} else {
		//dataPoints.shift();
		dataPoints.push({ x: data[0].x, y: parseFloat(data[0].y) });
		xValue++;
		yValue = parseFloat(data[0].y);
	}
	chart.render();
	setTimeout(updateData, 3000);
}

function updateData() {
	$.getJSON("/home/json?xstart=" + xValue + "&ystart=" + yValue + "&length=" + newDataCount, addData);
}

}
</script>
</head>
<body>
<div id="chartContainer" style="height: 370px; width: 100%;"></div>
<script src="https://canvasjs.com/assets/script/jquery-1.11.1.min.js"></script>
<script src="https://canvasjs.com/assets/script/jquery.canvasjs.min.js"></script>
</body>
</html>                              
using ASPNET_MVC_ChartsDemo.Models;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Web.Mvc;

namespace ASPNET_MVC_ChartsDemo.Controllers
{
	public class HomeController : Controller
	{
		// GET: Home
		public ActionResult Index()
		{
			return View();
		}

		public ContentResult JSON( int xStart = 0, double yStart = 0, int length = 1)
		{
			List<DataPoint> dataPoints = new List<DataPoint>();
			Random random = new Random();
			double y = yStart;

			for (int i = 0; i < length; i++)
			{
				y = y + random.Next(-1, 2);
				dataPoints.Add(new DataPoint(xStart + i, y));
			}

			return Content(JsonConvert.SerializeObject(dataPoints, _jsonSetting), "application/json");
		}

		JsonSerializerSettings _jsonSetting = new JsonSerializerSettings() { NullValueHandling = NullValueHandling.Ignore };

	}
}                        
using System;
using System.Runtime.Serialization;

namespace ASPNET_MVC_ChartsDemo.Models
{
	//DataContract for Serializing Data - required to serve in JSON format
	[DataContract]
	public class DataPoint
	{
		public DataPoint(double x, double y)
		{
			this.X = x;
			this.Y = y;
		}

		//Explicitly setting the name to be used while serializing to JSON.
		[DataMember(Name = "x")]
		public Nullable<double> X = null;

		//Explicitly setting the name to be used while serializing to JSON.
		[DataMember(Name = "y")]
		public Nullable<double> Y = null;
	}
}

Chart Customizations

The thickness and the color of the lines can be modified using lineThickness and lineColor properties. Other commonly used customization options include markerColor, lineDashType, etc.

Note   For step by step instructions, follow our ASP.NET MVC Integration Tutorial