[英]global service not working in angular2
我在angular2中創建了一個全局服務,用於跨所有組件訪問變量,如下所示。
global.objects.service.ts
import {Http} from 'angular2/http';
import {Observable} from 'rxjs/Observable';
import {Observer} from 'rxjs/Observer';
import 'rxjs/add/operator/share';
export class GlobalObjectsService {
workspace:any;
constructor() {
}
}
然后,我可以在我的workspace.component
訪問並為該對象設置新值,如下所示:
import {Component, OnInit,Input} from 'angular2/core';
import { GlobalService} from './../../../app/shared/services/global/global.service';
import { GlobalObjectsService} from './../../shared/services/global/global.objects.service';
import { WorkspaceService } from './../../../app/shared/services/pm/workspaces.service';
@Component({
selector: 'workspaces',
providers:[WorkspaceService],
templateUrl: 'app/project-manager/workspaces/workspaces.component.html'
})
export class WorkspacesComponent implements OnInit {
@Input() workspaces:any;
constructor(private globalService:GlobalService,private globalObjectsService:GlobalObjectsService,private workspaceService:WorkspaceService) { }
ngOnInit() { }
selectWorkspace(workspace_id:string){
this.workspaceService.getWorkspaceById(workspace_id,this.globalService.baseUrl).subscribe((workspace)=>{
this.globalObjectsService.workspace=workspace;
console.log(this.globalObjectsService.workspace); //this prints workspace correctly
});
}
}
但是當我嘗試在下面的組件中訪問此全局對象時,其顯示undefined
import {Component, OnInit ,Input} from 'angular2/core';
import { GlobalObjectsService} from './../../shared/services/global/global.objects.service';
@Component({
selector: 'pages',
templateUrl: 'app/project-manager/pages/pages.component.html'
})
export class PagesComponent implements OnInit {
@Input() pages:any;
public workspace:any;
constructor(private globalObjectsService:GlobalObjectsService) {
this.workspace=this.globalObjectsService.workspace;
console.log(this.workspace); //this is not working
}
ngOnInit() { }
}
在引導時,我沒有在根組件之外的任何組件的providers
中包含global.objects.service
。
有什么建議么?
您的服務缺少@Injectable()
指令。 像這樣添加它:
import {Injectable} from 'angular/core';
import {Http} from 'angular2/http';
import {Observable} from 'rxjs/Observable';
import {Observer} from 'rxjs/Observer';
import 'rxjs/add/operator/share';
@Injectable()
export class GlobalObjectsService {
workspace:any;
constructor() {
}
}
似乎您缺少的是將WorkspaceService
注入GlobalObjectsService
@Injectable()
export class GlobalObjectsService {
constructor(public workspace:WorkspaceService) {
}
}
您需要提供WorkspaceService
類的GlobalObjectsService
。 全局GlobalObjectsService
不能注入更多本地WorkspaceService
具體取決於您在哪里注入GlobalObjectsService
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.