检查material2 sidenav是否打开

有没有办法检查sidenav元素是否打开？根据API文档，有一个isOpen?参数，但就我而言，它会引发异常：EXCEPTION: Error in ./AppComponent class AppComponent - inline template:2:2 caused by: this.sidenav.isOpen is not a function

import { Component, OnInit, ElementRef } from '@angular/core';

@Component({
  selector: 'app-sidebar',
  template: `
  
      Sidenav
  
  `,
  styleUrls: ['./sidebar.component.css'],
  host: {
      '(document:click)': 'onClick($event)',
  }
})
export class SidebarComponent implements OnInit {

  constructor(private sidenav: ElementRef) { }

  ngOnInit() {
  }

  onClick() {
     if (this.sidenav.isOpen()) {
         this.sidenav.close();
     }
  }

}

Pankaj Parka.. 8

您必须用来ViewChild控制sidenav

@ViewChild('sidenav') sidenav: any;
opened: any = false;
onClick() {
   console.log(this.sidenav.opened);
}

普伦克

您必须用来ViewChild控制sidenav

@ViewChild('sidenav') sidenav: any;
opened: any = false;
onClick() {
   console.log(this.sidenav.opened);
}

普伦克