在饼图（高图）中突出显示活动数据标签

Question

我正在使用饼图（高级图表），并试图在活动中获得突出显示效果，我的意思是分离部分的标签（文本）。

是否可以添加任何可以说一个活动标签的类，以便可以通过CSS设置样式？

这是我要尝试的方法...任何建议？

Answer 1

您可以使用dataLabels。在属性系列中，您将具有 dataLabels

https://api.highcharts.com/highcharts/plotOptions.pie.dataLabels

这里是一个例子：

var colors = Highcharts.getOptions().colors,
  categories = [
    "Chrome",
    "Firefox",
    "Internet Explorer",
    "Safari",
    "Edge",
    "Opera",
    "Other"
  ],
  data = [
    {
      "y": 62.74,
      "color": colors[2],
      "drilldown": {
        "name": "Chrome",
        "categories": [
          "Chrome v65.0",
          "Chrome v64.0",
          "Chrome v63.0",
          "Chrome v62.0",
          "Chrome v61.0",
          "Chrome v60.0",
          "Chrome v59.0",
          "Chrome v58.0",
          "Chrome v57.0",
          "Chrome v56.0",
          "Chrome v55.0",
          "Chrome v54.0",
          "Chrome v51.0",
          "Chrome v49.0",
          "Chrome v48.0",
          "Chrome v47.0",
          "Chrome v43.0",
          "Chrome v29.0"
        ],
        "data": [
          0.1,
          1.3,
          53.02,
          1.4,
          0.88,
          0.56,
          0.45,
          0.49,
          0.32,
          0.29,
          0.79,
          0.18,
          0.13,
          2.16,
          0.13,
          0.11,
          0.17,
          0.26
        ]
      }
    },
    {
      "y": 10.57,
      "color": colors[1],
      "drilldown": {
        "name": "Firefox",
        "categories": [
          "Firefox v58.0",
          "Firefox v57.0",
          "Firefox v56.0",
          "Firefox v55.0",
          "Firefox v54.0",
          "Firefox v52.0",
          "Firefox v51.0",
          "Firefox v50.0",
          "Firefox v48.0",
          "Firefox v47.0"
        ],
        "data": [
          1.02,
          7.36,
          0.35,
          0.11,
          0.1,
          0.95,
          0.15,
          0.1,
          0.31,
          0.12
        ]
      }
    },
    {
      "y": 7.23,
      "color": colors[0],
      "drilldown": {
        "name": "Internet Explorer",
        "categories": [
          "Internet Explorer v11.0",
          "Internet Explorer v10.0",
          "Internet Explorer v9.0",
          "Internet Explorer v8.0"
        ],
        "data": [
          6.2,
          0.29,
          0.27,
          0.47
        ]
      }
    },
    {
      "y": 5.58,
      "color": colors[3],
      "drilldown": {
        "name": "Safari",
        "categories": [
          "Safari v11.0",
          "Safari v10.1",
          "Safari v10.0",
          "Safari v9.1",
          "Safari v9.0",
          "Safari v5.1"
        ],
        "data": [
          3.39,
          0.96,
          0.36,
          0.54,
          0.13,
          0.2
        ]
      }
    },
    {
      "y": 4.02,
      "color": colors[5],
      "drilldown": {
        "name": "Edge",
        "categories": [
          "Edge v16",
          "Edge v15",
          "Edge v14",
          "Edge v13"
        ],
        "data": [
          2.6,
          0.92,
          0.4,
          0.1
        ]
      }
    },
    {
      "y": 1.92,
      "color": colors[4],
      "drilldown": {
        "name": "Opera",
        "categories": [
          "Opera v50.0",
          "Opera v49.0",
          "Opera v12.1"
        ],
        "data": [
          0.96,
          0.82,
          0.14
        ]
      }
    },
    {
      "y": 7.62,
      "color": colors[6],
      "drilldown": {
        "name": 'Other',
        "categories": [
          'Other'
        ],
        "data": [
          7.62
        ]
      }
    }
  ],
  browserData = [],
  versionsData = [],
  i,
  j,
  dataLen = data.length,
  drillDataLen,
  brightness;


// Build the data arrays
for (i = 0; i < dataLen; i += 1) {

  // add browser data
  browserData.push({
    name: categories[i],
    y: data[i].y,
    color: data[i].color
  });

  // add version data
  drillDataLen = data[i].drilldown.data.length;
  for (j = 0; j < drillDataLen; j += 1) {
    brightness = 0.2 - (j / drillDataLen) / 5;
    versionsData.push({
      name: data[i].drilldown.categories[j],
      y: data[i].drilldown.data[j],
      color: Highcharts.Color(data[i].color).brighten(brightness).get()
    });
  }
}

// Create the chart
Highcharts.chart('container', {
  chart: {
    type: 'pie'
  },
  title: {
    text: 'Browser market share, January, 2018'
  },
  subtitle: {
    text: 'Source: <a href="http://statcounter.com" target="_blank">statcounter.com</a>'
  },
  yAxis: {
    title: {
      text: 'Total percent market share'
    }
  },
  plotOptions: {
    pie: {
      shadow: false,
      center: ['50%', '50%']
    }
  },
  tooltip: {
    valueSuffix: '%'
  },
  series: [{
    name: 'Browsers',
    data: browserData,
    size: '60%',
    dataLabels: {
      formatter: function () {
        return this.y > 5 ? this.point.name : null;
      },
      color: 'red',
      distance: -30
    }
  }, {
    name: 'Versions',
    data: versionsData,
    size: '80%',
    innerSize: '60%',
    dataLabels: {
      color: 'red',
      formatter: function () {
        // display only if larger than 1
        return this.y > 1 ? '<b>' + this.point.name + ':</b> ' +
          this.y + '%' : null;
      }
    },
    id: 'versions'
  }],
  responsive: {
    rules: [{
      condition: {
        maxWidth: 400
      },
      chartOptions: {
        series: [{
          id: 'versions',
          dataLabels: {
            enabled: false
          }
        }]
      }
    }]
  }
});

#container {
  max-width: 660px;
  margin: auto;
  height: 400px;
  margin: 0 auto;
}

.highcharts-text-outline{
  color: red;
}

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
<script src="https://code.highcharts.com/modules/export-data.js"></script>

<div id="container"></div>

`

Answer 2

您可以使用addClass方法从选定点为标签添加数据，然后以所需的方式对其进行样式设置：

    point: {
        events: {
            select: function() {
                var points = this.series.points;

                Highcharts.each(points, function(p) {
                    if (p.dataLabel.hasClass('data-label-selected')) {
                        p.dataLabel.removeClass('data-label-selected');
                    }
                });
                this.dataLabel.addClass('data-label-selected');
            }
        }
    }

实时演示：https://jsfiddle.net/BlackLabel/g0fcyhL2/

API：https://api.highcharts.com/class-reference/Highcharts.SVGElement#addClass