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>