代码之家 › 专栏 › 技术社区 › Chloe

如何为条形图创建图例?

chart.js charts javascript

Chloe · 技术社区 · 5 年前

如何创建如下图例:

我不知道如何为图例指定标签。他们也没有提供例子。

https://www.chartjs.org/docs/latest/configuration/legend.html

到目前为止,我有以下代码:

var topClickSourcesChart = new Chart('dashboard-click-source-chart', {
    type: 'bar',
    data: {
      labels: ["Facebook","Google","NONE",],
      datasets: [{
        data: [10,5,3,],
        backgroundColor: ['#4D90C3', '#866DB2', '#EA6F98', '#61BDF6', '#768BB7'],
      }],
    },
    options: {
        scales: {
            xAxes: [{
                display: false,
            }]
        },
        legend: {
            position: 'right',
            labels: {
                boxWidth: 10,
            }
        }
    }
});

0 回复 | 直到 5 年前

Kunal Khivensara 5 年前

要显示图例,您需要设置 label a的性质 dataset ,因此可以通过从下面所示的代码创建图表来生成所需的输出类型。小提琴-> https://jsfiddle.net/6nkcx8sq/

var topClickSourcesChart = new Chart('dashboard-click-source-chart', {
    type: 'bar',
    data: {
      labels: ["Number of users"],
      datasets: [{
        label: 'Facebook',
        data: [10],
        backgroundColor: '#4D90C3',
      },
      {
        label: 'Instagram',
        data: [15],
        backgroundColor: '#866DB2',
      },
      {
        label: 'Twitter',
        data: [7],
        backgroundColor: '#EA6F98',
      }],
    },
    options: {
        scales: {
            xAxes: [{
                display: false,
            }],
            yAxes: [{
            ticks: {
                beginAtZero: true
            }
        }]
        },
        legend: {
            position: 'right',
            labels: {
                boxWidth: 10,
            }
        }
    }
});

Chloe 5 年前

backgroundColor dataset .

var topClickSourceChart = new Chart('dashboard-click-source-chart', {
    type: 'bar',
    data: {
      labels: ["Facebook","Google","NONE",],
      datasets: [
          {label: "Facebook", data: [10]},{label: "Google", data: [5]},{label: "NONE", data: [3]},
      ]
    },
    options: {
        scales: {
            xAxes: [{
                display: false,
            }],
            yAxes: [{
                ticks: {
                    beginAtZero: true,
                }
            }]
        },
        legend: {
            position: 'right',
            labels: {
                boxWidth: 10,
            }
        }
    }
});
if (topClickSourceChart.data.datasets.length > 0) topClickSourceChart.data.datasets[0].backgroundColor = '#4D90C3';
if (topClickSourceChart.data.datasets.length > 1) topClickSourceChart.data.datasets[1].backgroundColor = '#866DB2';
if (topClickSourceChart.data.datasets.length > 2) topClickSourceChart.data.datasets[2].backgroundColor = '#EA6F98';
if (topClickSourceChart.data.datasets.length > 3) topClickSourceChart.data.datasets[3].backgroundColor = '#61BDF6';
if (topClickSourceChart.data.datasets.length > 4) topClickSourceChart.data.datasets[4].backgroundColor = '#768BB7';

data: {
  labels: [<c:forEach items="${clickSources}" var="cs">"${cs.key}",</c:forEach>],
  datasets: [
      <c:forEach items="${clickSources}" var="cs">{label: "${cs.key}", data: [${cs.value}]},</c:forEach>
  ]
},

我还是找不到一个办法把铁条的顶部弄圆。