Amcharts 4饼图中如何获取点击切片的值

Question

我正在尝试获取 Amcharts 4 3d 饼图中单击切片的值。我正在使用下面的代码：

<!-- Styles -->
<style>
#chartdiv {
  width: 100%;
  height: 500px;
}

</style>

<!-- Resources -->
<script src="https://www.amcharts.com/lib/4/core.js"></script>
<script src="https://www.amcharts.com/lib/4/charts.js"></script>
<script src="https://www.amcharts.com/lib/4/themes/animated.js"></script>

<!-- Chart code -->
<script>
am4core.ready(function() {

// Themes begin
am4core.useTheme(am4themes_animated);
// Themes end

var chart = am4core.create("chartdiv", am4charts.PieChart3D);
chart.hiddenState.properties.opacity = 0; // this creates initial fade-in

chart.legend = new am4charts.Legend();

chart.data = [
  {
    country: "Lithuania",
    litres: 501.9
  },
  {
    country: "Czech Republic",
    litres: 301.9
  },
  {
    country: "Ireland",
    litres: 201.1
  },
  {
    country: "Germany",
    litres: 165.8
  },
  {
    country: "Australia",
    litres: 139.9
  },
  {
    country: "Austria",
    litres: 128.3
  },
  {
    country: "UK",
    litres: 99
  },
  {
    country: "Belgium",
    litres: 60
  },
  {
    country: "The Netherlands",
    litres: 50
  }
];

var pieSeries = chart.series.push(new am4charts.PieSeries3D());
pieSeries.dataFields.value = "litres";
pieSeries.dataFields.category = "country";

// AMCHART OFFICIAL DOCUMENTATION: https://www.amcharts.com/docs/v4/tutorials/one-pulled-slice-per-pie-chart/#Solution
pieSeries.slices.template.events.on("hit", function(ev) {
  var series = ev.target.dataItem.component;
  console.log(series);
});

}); // end am4core.ready()
</script>

<!-- HTML -->
<div id="chartdiv"></div>
amCharts

现在，根据 Amcharts 官方文档，我添加了 hit 事件。我既不知道如何获取单击的切片的值，也没有找到任何关于它的 documentation/post。

现在，Whosebug 上有几篇关于 Amcharts 版本 3 库的帖子，我特别在寻找 Amchart 版本 4 库。

请指导我如何在 Amcharts 版本 4 库中获取单击切片的值。

更新：我期待得到chart.data的country的属性。

Answer 1

它实际上显示在您提供的 link 中。它只是有点埋葬。获取点击切片的赋值value属性，可以访问当前元素的dataItem.valueev.target:

//AMCHART OFFICIAL DOCUMENTATION: https://www.amcharts.com/docs/v4/tutorials/one-pulled-slice-per-pie-chart/#Solution
pieSeries.slices.template.events.on("hit", function(ev){
  console.log(ev.target.dataItem.value)
});

Amcharts 4饼图中如何获取点击切片的值

How to get the value of clicked slice in Amcharts 4 pie chart

javascript

pie-chart

amcharts4