角度通用:未定义导航器

我遵循官方的angular cli tutorial 将angular universal集成到现有angular cli应用程序。

我能够为angular cli应用程序执行SSR。但当我尝试整合时 ngx-leaflet ,我收到以下错误:

ReferenceError:未定义导航器 位于D:\ng2 ssr pwa\dist\server。js:40251:29

现在,我了解到传单正在尝试访问节点上下文中不可用的navigator对象。所以我决定推迟传单的呈现,直到页面加载到浏览器中,如图所示 SO thread 。 但我还是犯了同样的错误。您可以查看带有传单发行的演示应用程序 here 。

/src/app/browserModuleLoader。服务ts:

import { Component, Inject, Injectable, OnInit, PLATFORM_ID } from '@angular/core';
import { isPlatformBrowser, isPlatformServer } from '@angular/common';

@Injectable()
export class BrowserModuleLoaderService {
    private _L: any;

    public constructor(@Inject(PLATFORM_ID) private _platformId: Object) {
        this._init();
    }

    public getL() {
        return this._safeGet(() => this._L);
    }

    private _init() {
        if (isPlatformBrowser(this._platformId)) {
            this._requireLegacyResources();
        }
    }

    private _requireLegacyResources() {
        this._L = require('leaflet');
    }

    private _safeGet(getCallcack: () => any) {
        if (isPlatformServer(this._platformId)) {
            throw new Error('invalid access to legacy component on server');
        }

        return getCallcack();
    }
}

/src/app/传单/app/传单。组成部分ts:

// import * as L from 'leaflet';

import { ChangeDetectionStrategy, ChangeDetectorRef, Component, Inject, PLATFORM_ID } from '@angular/core';

import { BrowserModuleLoaderService } from '../browserModuleLoader.service';
import { isPlatformBrowser } from '@angular/common';

@Component({
    selector: 'app-leaflet',
    styleUrls: ['./leaflet.component.scss'],
    template: `
      <div  *ngIf="isBrowser">
        <div leaflet [leafletOptions]="options"></div>
        </div>
  `,
    changeDetection: ChangeDetectionStrategy.OnPush,
})
export class LeafletComponent {
    isBrowser: boolean;
    options = {};

    constructor(private cdr: ChangeDetectorRef,
        @Inject(PLATFORM_ID) platformId: Object,
        private browserModuleLoaderService: BrowserModuleLoaderService
    ) {
        this.isBrowser = isPlatformBrowser(platformId);
    }

    ngAfterViewInit() {
        console.log('this.isBrowser ', this.isBrowser);
        if (this.isBrowser) {
            const L = this.browserModuleLoaderService.getL();
            this.options = {
                layers: [
                    L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', { maxZoom: 18, attribution: '...' }),
                ],
                zoom: 5,
                center: L.latLng({ lat: 38.991709, lng: -76.886109 }),
            };
        }
        this.cdr.detach();
    }

}

/src/app/app。组成部分html:

<div>
  <app-leaflet></app-leaflet>
</div>

如何安全地延迟传单渲染,直到平台不是浏览器?

编辑:

我删除了与传单相关的所有代码(browserModuleLoader.service.ts、spool.component.ts等)并在应用程序中仅保留传单模块导入。单元实际上,这个导入导致了问题。

/src/app/app。单元ts:

import { AppComponent } from './app.component';
import { BrowserModule } from '@angular/platform-browser';
// import { BrowserModuleLoaderService } from './browserModuleLoader.service';
// import { LeafletComponent } from './leaflet/leaflet.component';
import { LeafletModule } from '@asymmetrik/ngx-leaflet';
import { NgModule } from '@angular/core';

@NgModule({
  declarations: [
    AppComponent,
    // LeafletComponent
  ],
  imports: [
    BrowserModule.withServerTransition({appId: 'my-app'}),
    LeafletModule.forRoot()
  ],
  providers: [
    // BrowserModuleLoaderService
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

/src/app/app。服务器单元ts:

import {AppComponent} from './app.component';
import {AppModule} from './app.module';
import {ModuleMapLoaderModule} from '@nguniversal/module-map-ngfactory-loader';
import {NgModule} from '@angular/core';
import {ServerModule} from '@angular/platform-server';

@NgModule({
  imports: [
    AppModule,
    ServerModule,
    ModuleMapLoaderModule
  ],
  bootstrap: [AppComponent],
})
export class AppServerModule {}

如何处理此nxg传单模块导入?