amCharts4中有没有办法监听“ XYChart中categoryX的单击事件”？

Question

我正在Angular6中使用amCharts4创建一个堆叠的条形图，我想在categoryX（标签）上添加一个点击侦听器，但找不到任何内容。

我已经按照他们的文档中的值在valueY上添加了点击监听器，但标签方面没有任何内容。

  let chart = am4core.create("chart-id", am4charts.XYChart);
  // Create axes

  let categoryAxis = chart.xAxes.push(new am4charts.CategoryAxis());
  categoryAxis.dataFields.category = "category";
  categoryAxis.renderer.grid.template.location = 0;
  categoryAxis.renderer.minGridDistance = 30;

  let valueAxis = chart.yAxes.push(new am4charts.ValueAxis());

  // Create series

  for (const key in chartData.categories) {
    if (chartData.categories.hasOwnProperty(key)) {

      let series = chart.series.push(new am4charts.ColumnSeries());
      series.dataFields.valueY = key;
      series.dataFields.categoryX = "category";
      series.name = key;
      series.columns.template.tooltipText = "{name}: [bold]{valueY}[/]";
      series.columns.template.fillOpacity = .8;
      series.stacked = true;
      series.columns.template.events.on("hit", (ev)=>{
        let item:any = ev.target.tooltipDataItem
        console.log("clicked on ", item.component.name, item.categoryX);
      }, this);

      if(this.get_category_color(key)){
        series.columns.template.fill = am4core.color(this.get_category_color(key)); 
      }

    }
  }
  // chart.add
  chart.cursor = new am4charts.XYCursor();
  chart.data = chartData.dataProvider