Real-Time Chart

29 Aug 20172 minutes to read

Chart can be updated dynamically with the real time data. Whenever you add a point or remove a point from the dataSource, you can call the redraw method to request the chart to redraw its content.

NOTE

You can get the chart instance using instance method.

HTML

<ej:Chart ID="chartContainer" runat="server"> 
   <%--Rendering empty Chart without data--%>
    <Series>
        <ej:Series>
            <Points></Points>
        </ej:Series>
    </Series>
</ej:Chart>

JS

//Using set interval to update chart dynamically
    window.setInterval(updateChart, 200);

    //Function that updates chart dynamically
    function updateChart(){

        //Creating chart instance
        var chart =  $("#chartContainer").ejChart("instance");      
        
        if (chart.model.series[0].points.length > 10)
               chart.model.series[0].points.splice(0, 1);
        
        var point = chart.model.series[0].points;
        var xValue = point.length > 0 ? point[point.length - 1].x + 1 : 1;
        point[point.length] = { x:  xValue, y: getRandomNumber( 1000 ) }
                
        //Update Chart dynamically using redraw option
        //chart.redraw() can also be used here instead of redraw option
        $("#chartContainer").ejChart("redraw");      
       }

Click here to view the online demo sample for real-time Chart.