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I found a similair thread to this, only change that was needed to his example was telling chartjs to not animate the chart. Then you can render it out of the screen in a div. You will have to make the div big enough so your chart is also large enough that you can use it.
Original thread: Render Chartjs on hidden DIV
var canvas = document.getElementById('myChart');
var ctx = canvas.getContext('2d');
var chart = new Chart(ctx, {
// The type of chart we want to create
type: 'line',
// The data for our dataset
data: {
labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
datasets: [{
label: 'My First dataset',
backgroundColor: 'rgb(255, 99, 132)',
borderColor: 'rgb(255, 99, 132)',
data: [0, 10, 5, 2, 20, 30, 45]
}]
},
options: {
animation: {
duration: 0
}
}
});
for (var id in Chart.instances) {
Chart.instances[id].resize();
Chart.instances[id].draw('1s');
Chart.instances[id].render('1s');
console.log(Chart.instances[id].toBase64Image());
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.js" integrity="sha512-hZf9Qhp3rlDJBvAKvmiG+goaaKRZA6LKUO35oK6EsM0/kjPK32Yw7URqrq3Q+Nvbbt8Usss+IekL7CRn83dYmw==" crossorigin="anonymous"></script>
<div style="position:absolute;left:-9999px;top:-9999px">
<canvas id="myChart"></canvas>
</div>
Source:stackexchange.com