使用angular在amcharts4中未找到数据时如何显示“未找到记录”消息

如何解决使用angular在amcharts4中未找到数据时如何显示“未找到记录”消息

我们将 amcharts4 lib 用于在 angular 8 中使用的图表，但我找不到有关如何显示类似“未找到数据”等消息的文档

ngAfterViewInit() {
    this.zone.runOutsideAngular(() => {
      let chart = am4core.create(this.chartDom.nativeElement,am4charts.XYChart);
      this.chart = chart;
      this.setBarchart();
    });
  }
 

private setBarChart() {
       let categoryAxis = barChart.xAxes.push(new am4charts.CategoryAxis());
       categoryAxis.datafields.category = this.mappingKeys.x;
        categoryAxis.renderer.grid.template.strokeWidth = 0;
        categoryAxis.fontSize = 11;    //Vertical axis
        let valueAxis = barChart.yAxes.push(new am4charts.ValueAxis());
        valueAxis.renderer.minGriddistance = 30;
        valueAxis.title.text = this.titleXkeyTranslate;

      // mapping the data to preview in charts
        barChart.data = this.inputFromParent.data; 
    }

当 this.inputFromParent.data.length = 0 即没有数据时，我想显示一条消息，我们该怎么做，请帮忙