myName:string; names: Array<string>; constructor(friendsService: FriendsService) {this.myName = 'Alice';this.names =friendsService.names; } } bootstrap(DisplayComponent);
import { Injectable } from "@angular/core";@Injectable()export class MessageService { message() { return 'This is MessageService';} } MessageService 是一项服务，但 @Injectable 没有 { providedIn: root } 选项。因此，它不存在于根注入器中。如果组件想要注入 MessageService ，则需要在 inject()函数...
TypeScript is used heavily as we build up our application, but TypeScript isn’t required. If you want to Inject a Service without using TypeScript, you’ll need to understand the@Injectdecorator. import {Component, View, Inject} from "angular2/angular2";import {TodoService} from"./todoSe...
functionuseHostService(){constelementRef=inject(ElementRef);return{updateClass(classes:string[]){classes.forEach((className)=>{elementRef.nativeElement.classList.add(className);});}}}@Component({...})exportclassSomeComponentimplementsOnInit{updateHost=useHostService();constructor(){}ngOnInit(){this....
提示ERROR Error: Uncaught (in promise): TypeError: Cannot read property 'resolveComponentFactory' of undefinedzz 查找错误发现是NzMessageService 在injector时发生的错误。 部分代码 constructor(protectedinjector: Injector,publiccomponentConfig: BaseComponentConfig,protectedsystemFormControl: ArSystemFormControl =nul...
app.service.ts import{Injectable}from'@angular/core';@Injectable()exportclassAppService{constructor(){}} app.component.ts import{Component,Inject,ViewChild,HostListener,ElementRef}from'@angular/core';import{CONFIG}from'./config';import{AppService}from'./app.service';@Component({selector:'my...
Which @angular/* package(s) are the source of the bug? core Is this a regression? No Description When using TestBed.inject on a standalone component, there seem to be problems that TestBed.inject does not return the correctly injected service. Here is an example of the service: @Component...
I am currently trying to inject http service in server.ts and then pass the returned data to app component to render it. Below is my snippet in server.ts - import {Http} from '@angular/http'; import {TemplateServiceFactory} from './app/s...
import{PageService}from'@syncfusion/ej2-angular-grids'; import{AppComponent}from'./app.component'; @NgModule({ declarations:[ AppComponent ], imports:[ BrowserModule,GridModule ], providers:[PageService], bootstrap:[AppComponent] }) App.Module.ts:exportclassAppModule{} ...
export class AppComponent { name = 'Angular'; @ViewChild('greet') private greetDiv: ElementRef; @HostListener('click', ['$event']) onClick($event: any) { console.dir($event); } constructor(public appService: AppService, @Inject(CONFIG) config: any) { ...