Detailed explanation of using echarts map in angular

<div #chart [ngClass]="'chart-box ' + (!option ? 'empty-chart' : '')"></div>

// Basic chart style.chart-box{
  font-weight: bold;
  border: 1px solid #dcdcdc;
  border-radius: 4px;
}
// Style when option is not available.empty-chart{
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 18px;
}

import { Component, ElementRef, Input, OnDestroy, OnInit, ViewChild } from '@angular/core';
import { fromEvent, Subscription, timer } from 'rxjs';
import { debounceTime, tap } from 'rxjs/operators';
import { ECharts, EChartsOption, init } from 'echarts';
@Component({
  selector: 'app-base-chart',
  templateUrl: './base-chart.component.html',
  styleUrls: ['./base-chart.component.scss']
})
export class BaseChartComponent implements OnInit, OnDestroy {
  @Input() option: EChartsOption;
  @Input() height = '300px';
  @Input() width = '100%';
  @ViewChild('chart', { static: true }) chart: ElementRef;
  aChart: ECharts;
  windowResize: Subscription;
  timer: Subscription;
  defaultGrid = {
    top: 10,
    right: 10,
    bottom: 30,
    left: 30,
  };
  constructor() { }
  ngOnInit(): void {
    this.setListen();
    this.boxStyleInit();
    if (!!this.option) {
      this.echartsInit();
    }else{
      this.chart.nativeElement.innerText = 'No data yet';
    }
  }
  // When the component is destroyed, cancel the related subscription ngOnDestroy(): void {
    if (this.windowResize) {
      this.windowResize.unsubscribe();
    }
    if (this.timer) {
      this.timer.unsubscribe();
    }
  }
  // Initialize the size of the container
  boxStyleInit(): void {
    this.chart.nativeElement.style.width = this.width;
    this.chart.nativeElement.style.height = this.height;
  }
  // Set the window's resize event listener and redraw the size of echarts setListen(): void {
    this.windowResize = fromEvent(window, 'resize').pipe(
      debounceTime(200),
      tap(res => {
        this.aChart.resize();
      })
    ).subscribe();
  }
  // Configure and generate echarts chart according to optionechartsInit(): void {
    this.aChart = init(this.chart.nativeElement);
    this.aChart.setOption(Object.assign({ grid: this.defaultGrid }, this.option));
    // Resize echarts through the delayer this.timer = timer(400).subscribe(res => {
      this.aChart.resize();
    });
  }
}

<app-base-chart [option]="option" width="100%" height="300px" ></app-base-chart>