Chart.js堆叠和分组条形图

问题描述

有什么方法可以使用Chart.js库做堆叠和分组的条形图？

is there any way to do a stacked and grouped bar chart with Chart.js library?

它应该看起来像这样

推荐答案

好的，我找到了解决方案。在此中有描述，解决方案位于

OK, I found the solution. It's described in this GitHub issue and solution is in this JSFiddle

Chart.defaults.groupableBar = Chart.helpers.clone(Chart.defaults.bar);

var helpers = Chart.helpers;
Chart.controllers.groupableBar = Chart.controllers.bar.extend({
  calculateBarX: function (index, datasetIndex) {
    // position the bars based on the stack index
    var stackIndex = this.getMeta().stackIndex;
    return Chart.controllers.bar.prototype.calculateBarX.apply(this, [index, stackIndex]);
  },

  hideOtherStacks: function (datasetIndex) {
    var meta = this.getMeta();
    var stackIndex = meta.stackIndex;

    this.hiddens = [];
    for (var i = 0; i < datasetIndex; i++) {
      var dsMeta = this.chart.getDatasetMeta(i);
      if (dsMeta.stackIndex !== stackIndex) {
        this.hiddens.push(dsMeta.hidden);
        dsMeta.hidden = true;
      }
    }
  },

  unhideOtherStacks: function (datasetIndex) {
    var meta = this.getMeta();
    var stackIndex = meta.stackIndex;

    for (var i = 0; i < datasetIndex; i++) {
      var dsMeta = this.chart.getDatasetMeta(i);
      if (dsMeta.stackIndex !== stackIndex) {
        dsMeta.hidden = this.hiddens.unshift();
      }
    }
  },

  calculateBarY: function (index, datasetIndex) {
    this.hideOtherStacks(datasetIndex);
    var barY = Chart.controllers.bar.prototype.calculateBarY.apply(this, [index, datasetIndex]);
    this.unhideOtherStacks(datasetIndex);
    return barY;
  },

  calculateBarBase: function (datasetIndex, index) {
    this.hideOtherStacks(datasetIndex);
    var barBase = Chart.controllers.bar.prototype.calculateBarBase.apply(this, [datasetIndex, index]);
    this.unhideOtherStacks(datasetIndex);
    return barBase;
  },

  getBarCount: function () {
    var stacks = [];

    // put the stack index in the dataset meta
    Chart.helpers.each(this.chart.data.datasets, function (dataset, datasetIndex) {
      var meta = this.chart.getDatasetMeta(datasetIndex);
      if (meta.bar && this.chart.isDatasetVisible(datasetIndex)) {
        var stackIndex = stacks.indexOf(dataset.stack);
        if (stackIndex === -1) {
          stackIndex = stacks.length;
          stacks.push(dataset.stack);
        }
        meta.stackIndex = stackIndex;
      }
    }, this);

    this.getMeta().stacks = stacks;
    return stacks.length;
  },
});

var data = {
  labels: ["January", "February", "March"],
  datasets: [
    {
      label: "Apples",
      backgroundColor: "rgba(99,255,132,0.2)",
      data: [20, 10, 30],
      stack: 1
    },
    {
      label: "Bananas",
      backgroundColor: "rgba(99,132,255,0.2)",
      data: [40, 50, 20],
      stack: 1
    },
    {
      label: "Cookies",
      backgroundColor: "rgba(255,99,132,0.2)",
      data: [60, 20, 20],
      stack: 1
    },
    {
      label: "Apples",
      backgroundColor: "rgba(99,255,132,0.2)",
      data: [20, 10, 30],
      stack: 2
    },
    {
      label: "Bananas",
      backgroundColor: "rgba(99,132,255,0.2)",
      data: [40, 50, 20],
      stack: 2
    },
    {
      label: "Cookies",
      backgroundColor: "rgba(255,99,132,0.2)",
      data: [60, 20, 20],
      stack: 2
    },
    {
      label: "Apples",
      backgroundColor: "rgba(99,255,132,0.2)",
      data: [20, 10, 30],
      stack: 3
    },
    {
      label: "Bananas",
      backgroundColor: "rgba(99,132,255,0.2)",
      data: [40, 50, 20],
      stack: 3
    },
    {
      label: "Cookies",
      backgroundColor: "rgba(255,99,132,0.2)",
      data: [60, 20, 20],
      stack: 3
    },
  ]
};

var ctx = document.getElementById("myChart").getContext("2d");
new Chart(ctx, {
  type: 'groupableBar',
  data: data,
  options: {
    legend: {
      labels: {
        generateLabels: function(chart) {
          return Chart.defaults.global.legend.labels.generateLabels.apply(this, [chart]).filter(function(item, i){
                return i <= 2;
          });
        }
      }
    },
    scales: {
      yAxes: [{
        ticks: {
          max: 160,
        },
        stacked: true,
      }]
    }
  }
});

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