[Chartjs]-How do I create a legend for a bar chart?

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4👍

✅

To show a legend you need to set the label property of a dataset, so the type of output you are expecting can be built by creating a chart from the code as shown below. Fiddle -> 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,
            }
        }
    }
});

0👍

I was able to get it with the following, but it was a pain in the ass for loops due to the backgroundColor having to be inside the 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';

Here is the JSP/JSTL loop:

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>
  ]
},

I still could not find a way to make the top of the bars rounded.

enter image description here

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