javascript - Chart.js 中带标签的分组条形图

Question

我需要重新创建一个与此非常相似的图表:

在研究时我发现了这个示例:

https://codepen.io/bencarmichael/pen/XeYJXJ

  datasets: [
    {
      label: "American Express",
      backgroundColor: "pink",
      borderColor: "red",
      borderWidth: 1,
      data: [3, 5, 6, 7,3, 5, 6, 7] // I need labels on this values
    }
  ]

它显示分组条形图。但它缺少每条的标签。如果在 Chart.js 上不可能，它可以是任何其他库。

Answer 1

使用此代码

View result in full screen mode

this is copied from the example you provided in you Question

var barChartData = {
  labels: [
    "Absence of OB",
    "Closeness",
    "Credibility",
    "Heritage",
    "M Disclosure",
    "Provenance",
    "Reliability",
    "Transparency"
  ],
  datasets: [
    {
      label: "American Express",
      backgroundColor: "pink",
      borderColor: "red",
      borderWidth: 1,
      data: [3, 5, 6, 7,3, 5, 6, 7],
      
    },
    {
      label: "Mastercard",
      backgroundColor: "lightblue",
      borderColor: "blue",
      borderWidth: 1,
      data: [4, 7, 3, 6, 10,7,4,6]
    },
    {
      label: "Paypal",
      backgroundColor: "lightgreen",
      borderColor: "green",
      borderWidth: 1,
      data: [10,7,4,6,9,7,3,10]
    },
    {
      label: "Visa",
      backgroundColor: "yellow",
      borderColor: "orange",
      borderWidth: 1,
      data: [6,9,7,3,10,7,4,6]
    }
  ]
};

var chartOptions = {
  responsive: true,
  legend: {
    position: "top"
  },
 "hover": {
                "animationDuration": 0
            },
   legend: {
                "display": false
            },
            tooltips: {
                "enabled": true
            },
  "animation": {
                "duration": 1,
                "onComplete": function () {
                    var chartInstance = this.chart,
                        ctx = chartInstance.ctx;

                    ctx.font = Chart.helpers.fontString(Chart.defaults.global.defaultFontSize, Chart.defaults.global.defaultFontStyle, Chart.defaults.global.defaultFontFamily);
                    ctx.textAlign = 'center';
                    ctx.textBaseline = 'bottom';

                    this.data.datasets.forEach(function (dataset, i) {
                      debugger
                        var meta = chartInstance.controller.getDatasetMeta(i);
                        meta.data.forEach(function (bar, index) {
                             var data = dataset.data[index];
                          ctx.font = '10pt Verdana';

ctx.save();
ctx.translate(0,500);
ctx.rotate(-0.5*Math.PI);
var rText = 'My test value ='+data ;
ctx.fillText(rText , 90,  bar._model.x+5);
ctx.restore();
                        });
                    });
                }
            },
  title: {
    display: true,
    text: "Chart.js Bar Chart"
  },
  scales: {
    yAxes: [{
      ticks: {
        beginAtZero: true
      }
    }]
  }
}

window.onload = function() {
  var ctx = document.getElementById("canvas").getContext("2d");
  window.myBar = new Chart(ctx, {
    type: "bar",
    data: barChartData,
    options: chartOptions
  });
};

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.0/Chart.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<div id="container" style="width: 75%;">
  <canvas id="canvas"></canvas>
</div>