The shade of grey on the curve appears instead of the usual red on the iPad. Any ideas on how to fix

I am having trouble creating a curve like the one shown below on my iPad. The color appears to be gray and does not work properly.

Is this a bug with ChartJS or is there a solution to fix this issue?

This problem occurs when the type value is set to "line".

Interestingly, it works fine on iPad when the type value is set to "bar".

Any suggestions on how to address this problem?

https://i.sstatic.net/sT63P.jpg

var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
    type: 'line',
    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: {
            yAxes: [{
                ticks: {
                    beginAtZero:true
                }
            }]
        }
    }
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.bundle.min.js"></script>
<div class="chart-container" style="position: relative; margin-top:30px; height:60vh; width:90vh">
<canvas id="myChart"></canvas>

javascriptcssipadchart.jsvisualization

Answer №1

The issue stemmed from the lists in the backgroundColor and borderColor properties.

datasets: [{
            label: 'Number of Votes',
            data: [12, 19, 3, 5, 2, 3],
            backgroundColor: 'rgba(255, 159, 64, 0.2)',
            borderColor: 'rgba(255,99,132,1)',
            borderWidth: 1
        }

It appears that for the bar type, each label can have its own color.

However, when using the line type, a single color list is not possible.

With the line type, only one color is assigned to the area under the curve and another color to the border.

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