ChartJS 画布在 IE、Safari 和 Firefox 中不显示 rgba 颜色

ChartJS canvas not displaying rgba colors in IE, Safari and Firefox(ChartJS 画布在 IE、Safari 和 Firefox 中不显示 rgba 颜色)

问题描述

Im using ChartJS to display some data but it's not rendering the canvas element correctly in IE, Firefox and Safari.

My guess is that the background color property lacks any of the used prefixes for the other browser since it works fine in Chrome.

Anyone else had this issue?

Chrome:

Firefox, Safari and IE:

The code:

    window.onload = function() {
        var ctx = document.getElementById("canvas");
        var myChart = new Chart(ctx, {
            type: 'line',
            data: {
                labels: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug"],
                datasets: [{
                    label: '# of Value',
                    data: [12, 19, 3, 5, 2, 3, 10, 29],
                    backgroundColor: [
                        'rgba(33, 145, 81, 0.2)',
                        'rgba(33, 145, 81, 0.2)',
                        'rgba(33, 145, 81, 0.2)',
                        'rgba(33, 145, 81, 0.2)',
                        'rgba(33, 145, 81, 0.2)',
                        'rgba(33, 145, 81, 0.2)',
                        'rgba(33, 145, 81, 0.2)',
                        'rgba(33, 145, 81, 0.2)'
                    ],
                    borderColor: [
                        'rgba(33, 145, 81, 1)',
                        'rgba(33, 145, 81, 0.2)',
                        'rgba(33, 145, 81, 0.2)',
                        'rgba(33, 145, 81, 0.2)',
                        'rgba(33, 145, 81, 0.2)',
                        'rgba(33, 145, 81, 0.2)',
                        'rgba(33, 145, 81, 0.2)',
                        'rgba(33, 145, 81, 0.2)'
                    ],
                    borderWidth: 1
                }]
            },
            options: {
                scales: {
                    yAxes: [{
                        ticks: {
                            beginAtZero:true
                        }
                    }]
                }
            }
        });
    };
    });

The problem is that you're giving the backgroundColor property an array of Color instead of a single one.

The line chart, with the fill property set to true needs to have only one Color, or else it will break like it does on your chart.

---

So you just need to change from :

backgroundColor: [
    'rgba(33, 145, 81, 0.2)',
    'rgba(33, 145, 81, 0.2)',
    'rgba(33, 145, 81, 0.2)',
    'rgba(33, 145, 81, 0.2)',
    'rgba(33, 145, 81, 0.2)',
    'rgba(33, 145, 81, 0.2)',
    'rgba(33, 145, 81, 0.2)',
    'rgba(33, 145, 81, 0.2)'
],

To :

backgroundColor: 'rgba(33, 145, 81, 0.2)',

And it will give you this result whatever browser you are using.
(tests were done on IE 11 and Firefox 48)

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