Angular 4 个美国图表

Question

我在 Angular 项目中尝试集成 amCharts。我的 html 页面如下所示：

<div class="col-md-12">
        <div id="chartdiv" style="width: 100%; height: 500px"></div>
</div>

我从文档中复制的组件，但由于某种原因它不起作用：

import { Component, NgZone } from "@angular/core";
import * as am4core from "@amcharts/amcharts4/core";
import * as am4charts from "@amcharts/amcharts4/charts";
import am4themes_animated from "@amcharts/amcharts4/themes/animated";



am4core.useTheme(am4themes_animated);

@Component({
    selector: 'page',
    styleUrls: ['./page.scss'],
    templateUrl: './page.html'
})
export class PageComponent {
    private chart: am4charts.XYChart;

    constructor(private service: PageService,private zone: NgZone) {
    }

    ngAfterViewInit() {
        this.zone.runOutsideAngular(() => {
            let chart = am4core.create("chartdiv", am4charts.XYChart);

            chart.paddingRight = 20;

            let data = [];
            let visits = 10;
            for (let i = 1; i < 366; i++) {
                visits += Math.round((Math.random() < 0.5 ? 1 : -1) * Math.random() * 10);
                data.push({ date: new Date(2018, 0, i), name: "name" + i, value: visits });
            }

            chart.data = data;

            let dateAxis = chart.xAxes.push(new am4charts.DateAxis());
            dateAxis.renderer.grid.template.location = 0;

            let valueAxis = chart.yAxes.push(new am4charts.ValueAxis());
            valueAxis.tooltip.disabled = true;
            valueAxis.renderer.minWidth = 35;

            let series = chart.series.push(new am4charts.LineSeries());
            series.dataFields.dateX = "date";
            series.dataFields.valueY = "value";

            series.tooltipText = "{valueY.value}";
            chart.cursor = new am4charts.XYCursor();

            let scrollbarX = new am4charts.XYChartScrollbar();
            scrollbarX.series.push(series);
            chart.scrollbarX = scrollbarX;

            this.chart = chart;
        });
    }

    ngOnDestroy() {
        this.zone.runOutsideAngular(() => {
            if (this.chart) {
                this.chart.dispose();
            }
        });
    }

}

但我仍然遇到错误 EXCEPTION: Uncaught (in promise): TypeError: {} is not a constructor TypeError: {} is not a constructor。 Unhandled Promise rejection: {} is not a constructor ; Zone: angular ; Task: Promise.then ; Value: TypeError: {} is not a constructor。我尝试调试它，但在使用 am4core 时出现错误。正如我所说，我已经从文档中复制了代码，但它仍然无法正常工作。

Answer 1

我刚刚按照指南使用 amchart4 创建了一个新的 angular 应用程序，没有任何错误。您使用的是哪个版本的 Angular 和 TypeScript？正如指南所说，AmChart 需要 TypeScript 2.8 或更高版本。

Answer 2

问题是 init 方法应该是 ngOnInit 而不是 ngAfterViewInit。其余的都很好。 https://stackblitz.com/edit/angular-gu9tkx

区别是here

Answer 3

您正在使用 ngAfterViewInit(),ngOnDestroy() Lifecycle Hooks，因此您只需要实现该接口即可。

export class PageComponent implements OnDestroy,AfterViewInit {

Answer 4

我在“tsconfig.json”中的“compilerOptions”下应用了这些行

"noImplicitAny": false,
"strictNullChecks": false,

Angular 4 个美国图表

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