从服务器更新 ChartJS 图表的数据

Question

这几天我的 Angular 网站出现了问题。我的目标是从 S7-1500 接收数据以在电视上实时显示数据。

我成功地获得了一些实时数据，但我遇到了一个小问题。当我换页时，图表上的数据正在刷新，但如果我停留在同一页上，则没有任何反应。

在此服务中，我从 API 获取数据，并将“consoAir”放在 10 数组的末尾：

import {BehaviorSubject, combineLatest, forkJoin, timer} from 'rxjs';
import {HttpClient} from '@angular/common/http';
import {Injectable} from '@angular/core';
import {switchMap} from 'rxjs/operators';

@Injectable()
export class LineService{
  constructor(private http: HttpClient) {
    this.getData();
  }

  _consoAir = [ Array(10).fill(0),
                Array(10).fill(0),
                Array(10).fill(0),
                Array(10).fill(0),
                Array(10).fill(0),
                Array(10).fill(0)];
  lineSubject = new BehaviorSubject<RcvData[]>([]);

  getData(): void {
    const lists: string[] = [
      'assets/donnee-l1.csv',
      'assets/donnee-l2.csv',
      'assets/donnee-l3.csv',
      'assets/donnee-l4.csv',
      'assets/donnee-l5.csv',
      'https://192.168.0.2/DataLogs?Path=/DataLogs/MyDataLog9.csv&Action=DOWNLOAD&E=1'
    ];
    const reqs$ = lists.map(list => this.http.get(list, {responseType: 'text'}));

    timer(0, 5000).pipe(
      switchMap(_ => forkJoin(reqs$))
    ).subscribe(listResults => {
        const parsedListResults = listResults.map(data => {
          const csvToRowArray = data.split('\n');
          const lastRow = csvToRowArray[csvToRowArray.length - 2];
          const row = lastRow.split(',');
          return new RcvData(
            parseInt(row[0], 10),
            row[1], row[2], parseInt(row[3], 10), row[4], row[5], row[6], row[7],
            parseInt(row[8], 10),
            parseInt(row[9], 10),
            parseInt(row[10], 10),
            parseInt(row[11], 10),
            parseFloat(row[12]),
            parseFloat(row[13]),
            parseFloat(row[14]),
            parseFloat(row[15]),
            parseFloat(row[16]),
            parseInt(row[17], 10));
        });
        this.lineSubject.next(parsedListResults);

        for (const module of parsedListResults) {
          this._consoAir[module.id - 1].push(module.consoAir);

          if (this._consoAir[module.id - 1].length > 10){
            this._consoAir[module.id - 1].splice(0, 1);
          }
        }
        console.log(this._consoAir);

      });
  }
}




class RcvData{
  seqNo: number;
  date: string;
  utcTime: string;
  id: number;
  name: string;
  refCharge: string;
  refDecharge: string;
  quantiteEnCours: string;
  quantiteHoraireReel: number;
  quantiteHoraireTheorique: number;
  quantitePosteReel: number;
  quantitePosteTheorique: number;
  trpHeureReel: number;
  trpPosteReel: number;
  trpObjectif: number;
  consoAir: number;
  consoElec: number;
  status: number;


  constructor(
    seqNo: number,
    date: string,
    utcTime: string,
    id: number,
    name: string,
    refCharge: string,
    refDecharge: string,
    quantiteEnCours: string,
    quantiteHoraireReel: number,
    quantiteHoraireTheorique: number,
    quantitePosteReel: number,
    quantitePosteTheorique: number,
    trpHeureReel: number,
    trpPosteReel: number,
    trpObjectif: number,
    consoAir: number,
    consoElec: number,
    status: number)
  {
    this.seqNo = seqNo;
    this.date = date.replace(/ /g, '').replace(/"/g, '');
    this.utcTime = utcTime.replace(/ /g, '').replace(/"/g, '');
    this.id = id;
    this.name = name.replace(/"/g, '');
    this.refCharge = refCharge.replace(/ /g, '').replace(/"/g, '');
    this.refDecharge = refDecharge.replace(/ /g, '').replace(/"/g, '');
    this.quantiteEnCours = quantiteEnCours.replace(/ /g, '').replace(/"/g, '');
    this.quantiteHoraireReel = quantiteHoraireReel;
    this.quantiteHoraireTheorique = quantiteHoraireTheorique;
    this.quantitePosteReel = quantitePosteReel;
    this.quantitePosteTheorique = quantitePosteTheorique;
    this.trpHeureReel = trpHeureReel;
    this.trpPosteReel = trpPosteReel;
    this.trpObjectif = trpObjectif;
    this.consoAir = consoAir;
    this.consoElec = consoElec;
    this.status = status;
  }
}

在此 ts 中，我想从服务接收数组数据以显示：

import {Component, Input, OnDestroy, OnInit} from '@angular/core';
import { ChartType } from 'chart.js';
import { LineService } from '../services/line.service';
import {ActivatedRoute} from '@angular/router';
import {combineLatest, Subscription} from 'rxjs';
import {filter, map} from 'rxjs/operators';
import {log} from 'util';

@Component({
  selector: 'app-conso-graph',
  templateUrl: './conso-graph.component.html',
  styleUrls: ['./conso-graph.component.scss']
})
export class ConsoGraphComponent implements OnDestroy{

  lineSubscription: Subscription;
  id: number;
  consoAir: number;
  chartType: ChartType;
  chartOptions: any;
  _time: any[] = Array(10).fill(0);
  _consoAir: any[] = this.lineService._consoAir;
  
  constructor(private lineService: LineService,
              private route: ActivatedRoute) {
    this.chartIt();
  }

  _focusedData$ = combineLatest(
    this.lineService.lineSubject.pipe(filter(x => x.length > 0)),
    this.route.params.pipe(filter(x => !!x.id), map(x => x.id - 1))
  ).pipe(
    map(([csvs, id]) => csvs[id])
  );

  gestionData(): void {
    this.lineSubscription = this._focusedData$.subscribe(x => this.id = x.id);
    this._consoAir = this.lineService._consoAir;
    console.log(this._consoAir[5]);
  }

  async chartIt() {
    await this.gestionData();
    this.chartType = 'line';
  }

  chartClicked(e: any): void { }
  chartHovered(e: any): void { }

  ngOnDestroy(): void {
    this.lineSubscription.unsubscribe();
  }

}

在这里，我在 HTML 中显示图表：

<div class="doubleTrp">
    <canvas baseChart
            [chartType]="chartType"
            [datasets]="[
              {
              data: this._consoAir[this.id - 1], label: 'Consommation Air'
              }
            ]"
            [labels]="this._time"
            [colors]="[{
              backgroundColor: ['rgb(255, 182, 0)'],
              hoverBackgroundColor: ['rgb(185, 30, 30)'],
              borderWidth: 1
            }]"
            [options]="{
              responsive: true,
              cutoutPercentage: 100,
              title : {
                display: true,
                text: 'Consommation Air',
                fontSize: 25
              }
            }"
            [legend]="true"
            (chartHover)="chartHovered($event)"
            (chartClick)="chartClicked($event)">
    </canvas>
</div>

我尝试了 SetInterval、Timer 或其他东西，但在服务中，数组是实时变化的，但不是在图形组件中...

每个例子都会对我有所帮助。提前致谢。

Answer 1

我通过这样做找到了解决方案：

[datasets]="[
                {
                    data: [ graphikElec[0],
                            graphikElec[1],
                            graphikElec[2],
                            graphikElec[3],
                            graphikElec[4],
                            graphikElec[5],
                            graphikElec[6],
                            graphikElec[7],
                            graphikElec[8],
                            graphikElec[9]
                          ],
                          label: 'kWh'
                },

从服务器更新 ChartJS 图表的数据

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