I'm trying to periodically update a chart. The data is making into the dataset but I can't get it to draw the chart. What am I doing wrong?
const ctx = document.querySelector('#apichart canvas').getContext('2d');
const apichart = new Chart(ctx, {
type: 'line',
data: {datasets:[{
label:'Pressure',
data: [1025,1000],
fill:false,
borderColor: 'rgb(75, 192, 192)',
tension:0.1
}]},
options: {
scales: {
y: {
beginAtZero: true
}
}
}
});
setInterval(function run(){
apichart.data.datasets[0].data.push(1025 * Math.random());
apichart.update();
}, 10000);#apichart{background:#777; position:absolute; top:0; right:0; bottom:0; left:0;}<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.6.2/chart.min.js"></script>
<div id="apichart">
<canvas></canvas>
</div>I think this problem related to labels, so I have added labels array and update them in setInterval each time and it works.
const ctx = document.querySelector('#apichart canvas').getContext('2d');
const apichart = new Chart(ctx, {
type: 'line',
data: {labels: [1, 2],
datasets:[{
label:'Pressure',
data: [1025,1000],
fill:false,
borderColor: 'rgb(75, 192, 192)',
tension:0.1
}]},
options: {
scales: {
y: {
beginAtZero: true
}
}
}
});
setInterval(function run(){
apichart.data.labels.push(Math.random());
apichart.data.datasets[0].data.push(1025 * Math.random());
apichart.update();
}, 1000);<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.6.2/chart.min.js"></script>
<div id="apichart">
<canvas></canvas>
</div>