我正在使用此NPM软件包制作图表:https://www.npmjs.com/package/angular-highcharts
我有一个接口,我想从接口中取值以填充图表。在这个阶段,我想要的是线图。
我尝试了各种使用数组来执行此操作的方法,只要我通过硬编码其正常工作的所有值来初始化数组,但我想将服务值从服务中动态加载到接口中,然后取从接口到图表的值。我在做什么错?
这是我的component.ts
import { Component, OnInit } from '@angular/core';
import { Chart } from 'angular-highcharts';
import { WeatherstatsService } from '../weatherstats.service';
import 'rxjs/add/operator/map';
interface WeatherData {
id: any;
year: any;
measurement_type: string;
location: string;
month_or_season: string;
value?: any;
}
let datavalues: WeatherData [] = [];
@Component({
selector: 'weatherchart',
templateUrl: './weatherchart.component.html',
styleUrls: ['./weatherchart.component.css']
})
export class WeatherchartComponent implements OnInit {
constructor(private weatherstatsservice: WeatherstatsService) { }
title = "Title";
data: any;
datavalues = datavalues;
values: Array<number> = [];
chart = new Chart({
chart: {
type: 'line'
},
title: {
text: this.title,
},
credits: {
enabled: false
},
series: [{
name: 'Line 1',
data: this.datavalues.year,
}]
});
// add point to chart serie
add() {
this.chart.addPoint(Math.floor(Math.random() * 10));
}
ngOnInit() {
this.weatherstatsservice.getWeatherData()
.subscribe(data => {
this.data = data.slice(0, 100);
if(this.data){
this.data.forEach( res => {
this.datavalues.push({
id: res.id,
year: res.year,
measurement_type: res.measurement_type,
location: res.location,
month_or_season: res.month_or_season,
value: res.value,
})
});
console.log(this.datavalues);
}
})
}
}
这是图书馆的常见问题,我在NG2-charts上遇到了同样的问题,可以使用API进行Redraw IT解决。
您可以通过将图表的实例作为
进行<chart [options]="options" (load)="saveInstance($event.context)"></chart>
和ts
chart: Object;
saveInstance(chartInstance): void {
this.chart = chartInstance;
}
,当您从API获取数据时,您可以用作
重新绘制updateSeries(data: Array<any>): void {
this.chart.series[0].setData(data);
}