ChartJS Create New chart from variable

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you must add document.getElementById("MyChart") inside Chart() object and you will get something like this

<script src="https://cdn.jsdelivr.net/npm/chart.js@3.6.0/dist/chart.min.js"></script>

<canvas id="MyChart" width="400" height="200"></canvas>
<script>
new Chart(document.getElementById("MyChart"), {type: 'bar',
data: {
labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
datasets: [{
    label: '# of Votes',
    data: [12, 19, 3, 5, 2, 3],
    backgroundColor: [
        'rgba(255, 99, 132, 0.2)',
        'rgba(54, 162, 235, 0.2)',
        'rgba(255, 206, 86, 0.2)',
        'rgba(75, 192, 192, 0.2)',
        'rgba(153, 102, 255, 0.2)',
        'rgba(255, 159, 64, 0.2)'
    ],
    borderColor: [
        'rgba(255, 99, 132, 1)',
        'rgba(54, 162, 235, 1)',
        'rgba(255, 206, 86, 1)',
        'rgba(75, 192, 192, 1)',
        'rgba(153, 102, 255, 1)',
        'rgba(255, 159, 64, 1)'
    ],
    borderWidth: 1
}]
},
options: {
    scales: {
        y: {
            beginAtZero: true
        }
    }
}})

;
</script>

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