javascript - Chart.js:标记每个数据集

Question

我一直在尝试让 chart.js 为每个数据集添加一个标签，但第一个标签位于两个数据集下方，第二个标签位于图表的空白区域。

var powerChart = new Chart(powerCanvas, {
  type: "bar",
  data: {
    labels: ["Volts", "Amperes"],
    datasets: [
      {
        label: "Volts", // This bar should have this label underneath itself
        data: [24.78], // Initial value, will be overwritten
      },
      {
        label: "Amperes", // This bar should have this label underneath itself
        data: [14.51],
      },
    ],
  },
  options: {},
});

参见 https://jsfiddle.net/w20c3tru/2/对于我尝试过的和一个有效的例子。注意:我试图跟随 Chart.js Line-Chart with different Labels for each Dataset但看不出有什么区别。

Answer 1

注意下面的注释:

var powerChart = new Chart(powerCanvas,
    {
        type: 'bar',
        data:
        {
            labels: ['Volts', 'Amperes'],
            datasets:
                [
                    {
                        label: 'Value',       // This is actually the label that shows up when you hover over a bar
                        data: [24.78, 14.51]  // NOTE: Number of labels defined above should equal number of values here
                    },
                ]
        },
        options:
        {
        }
    }
);

编辑:

data:
{
    labels: ['Volts', 'Amperes'],
    datasets:
        [
            {
                data: [24.78, 14.51],  // Volts and amperes, respectively
                borderWidth: 1,
                borderColor: ['#0000e0', '#e00000'],  // Border colors for volts and amperes, respectively
    
            },
        ]
},