angular - highcharts-angular 从数据库动态更新

Question

我在 Angular 6 应用程序中使用 highcharts-angular。当我设置数据时，在 ngOnInit 中硬核它，图表可见并且工作正常。

但我想动态更新图表系列，意思是向系列添加点，添加新系列......这将在调用 Web API 并获取新数据、调用 loadBidChartData() 后完成。

如果我为聊天设置新系列，或更新系列，图表看不到变化，初始状态没有变化。 我该如何解决这个问题？

这是示例代码的小和平在 html 中是这样的:

<highcharts-chart [Highcharts]="Highcharts" [options]="chartOptions" style="width: 100%; height: 400px; display: block; overflow: auto;" [update]="true" ></highcharts-chart> 

Angular :

 import * as Highcharts from 'highcharts';
 export class ExampleComponent implements OnInit {
  Highcharts = Highcharts; // required    
  chartOptions = {
    chart: {
        type: "scatter",
        width: 900           
        },
    },
    tooltip: {
        valueDecimals: 0,
        formatter: function () {
            return this.y + ' €';
        }
    },
    title: {
        text: ''
    },
    xAxis: {
        type: 'datetime',            
    },
    yAxis: {
        type: 'number',            
    },
    legend: {
        layout: 'vertical',
        align: 'right',
        verticalAlign: 'top',
        floating: false,
        borderWidth: 1
    },
    series: []      
};

ngOnInit(): void {
    this.chartOptions.series= [{
            name: 'first last',
            data: [[Date.UTC(2018, 11, 16, 10, 56, 25), 23], [Date.UTC(2018, 11, 16, 10, 57, 15), 132], [Date.UTC(2018, 11, 16, 10, 58, 2), 312], [Date.UTC(2018, 11, 16, 10, 58, 15), 432]]
        }];
}

loadBidChartData(bidApiModel: BidItem[]): void {
    this.chartOptions.series= [{
        name: 'first last',
        data: [[Date.UTC(2018, 11, 16, 10, 56, 25), 23], [Date.UTC(2018, 11, 16, 10, 57, 15), 132], [Date.UTC(2018, 11, 16, 10, 58, 2), 312], [Date.UTC(2018, 11, 16, 10, 58, 15), 432]]
    },
    {
        name: 'second last',
        data: [[Date.UTC(2018, 11, 16, 10, 56, 28), 50], [Date.UTC(2018, 11, 16, 10, 56, 45), 152], [Date.UTC(2018, 11, 16, 10, 56, 53), 250], [Date.UTC(2018, 11, 16, 10, 57, 11), 320]]
    }];
 }
}  

解决方案:在后台更新并向 Highcharts 添加和删除点的工作演示:https://stackblitz.com/edit/angular-bv26xz
感谢 User3250 和 Wojciech Chmiel 的帮助。

Answer 1

您需要使用 [(update)] 标志来更新系列如下:

loadBidChartData(bidApiModel: BidItem[]): void {
    this.chartOptions.series= [{
        name: 'first last',
        data: [[Date.UTC(2018, 11, 16, 10, 56, 25), 23], [Date.UTC(2018, 11, 16, 10, 57, 15), 132], [Date.UTC(2018, 11, 16, 10, 58, 2), 312], [Date.UTC(2018, 11, 16, 10, 58, 15), 432]]
    },
    {
        name: 'second last',
        data: [[Date.UTC(2018, 11, 16, 10, 56, 28), 50], [Date.UTC(2018, 11, 16, 10, 56, 45), 152], [Date.UTC(2018, 11, 16, 10, 56, 53), 250], [Date.UTC(2018, 11, 16, 10, 57, 11), 320]]
    }];
   this.updateFlag = true;
}

<highcharts-chart [Highcharts]="Highcharts" [options]="chartOptions" style="width: 100%; height: 400px; display: block; overflow: auto;" [(update)]="updateFlag" ></highcharts-chart>

此处的工作演示:https://stackblitz.com/edit/angular-d5spve