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This sample demonstrates how to change (add, remove) chart data points.

For detailed implementation, please take a look at the HTML code tab.
 
<!DOCTYPE html>
<html>
<head>
    <title>Change Data Points Example - JavaScript Chart by dvxCharts</title>
    <link rel="stylesheet" type="text/css" href="../../css/dvxCharts.chart.min.css" />
    <link rel="stylesheet" type="text/css" href="../../themes/base/styles.css" />
    <script src="../../js/dvxCharts.chart.min.js" type="text/javascript"></script>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
    <style>
        .example-container {
            width: 100%;
            max-width: 500px;
            height: 300px;
        }
    </style>
    
    <script lang="javascript" type="text/javascript">

        var state = {
            title: {
                text: 'Change Data Points'
            },
            series: [
                {
                    title: 'Series',
                    type: 'column',
                    data: [20, 50, 40, 60, 70]
                }
            ]
        };

        var chart = new dvxCharts.Chart(state);
        chart.write('container');

        function addDataPont() {

            // get the data from the first series
            var data = state.series[0].data;

            // add new data item
            data.push(Math.round(Math.random() * 100));

            // set the new state
            chart.setState(state);
        }

        function removeDataPoint() {

            // get the data from the first series
            var data = state.series[0].data;

            // remove the last data item
            data.splice(data.length - 1, 1);

            // update (redraw) the chart
            chart.setState(state);
        }
    </script>

</head>
<body>
    <div id="container" class="example-container">
    </div>
    <br />
    <input id="buttonAddPoint" type="button" value="Add new point" onclick="addDataPont()" />
    <input id="buttonRemovePoint" type="button" value="Remove last point" onclick="removeDataPoint()" />
    <br />
</body>
</html>