Angular 2 - 共享服务的实现

Question

我正在尝试实现我在Stack Overflow中找到的解决方案,但面临困难.我有一个服务和一个组件,并且在实现上有些不正确.

错误:TypeError:无法读取undefined属性'next'可能有什么错误或缺失？有什么更多的缺失？同样在我的终端窗口,我收到此错误,但它没有反映在我的浏览器控制台上:错误TS1005:'=>'预期.

import {Injectable} from 'angular2/core';
import {Observable} from 'rxjs/Observable';
import {Observer} from 'rxjs/Observer';
@Injectable()
export class GlobalService {
data: any;
dataChange: Observable<any>;
constructor() {
this.dataChange = new Observable((observer:Observer) { // this is the TS1005 error.
  this.dataChangeObserver = observer;
});
}
setData(data:any) {
this.data = data;
this.dataChangeObserver.next(this.data); //Line of the critical error (next)
} 
}

这是消耗服务的组件....(我只会放置相关的行)

import {GlobalService} from "../../../global.service";
import(...)
@Component({
    providers: [GlobalService],
template: `<p>{{myData}}<>/p><span (click)="addTag(1, 'test')">Add more</span>` 
});
export class MyComponent  {
    addTag (id,desc){
       this._global.setData({ attr: 'some value' });
    }
}
constructor(private _global: GlobalService) {

}

那么,使这个简单的组件显示结果并添加新元素并可观察到是什么错误和/或缺失？我之前从未实现过observable.

Answer 1

你的代码不是那么清晰,因此很难理解.仍然试图以这种方式帮助你.检查并告诉我它是否不起作用.

...
import {Injectable,EventEmitter,Output} from 'angular2/core';
@Injectable()
export class GlobalService {
data: any;    
@Output dataChangeObserver: EventEmitter=new EventEmitter();

  constructor() {
  });

  setData(data:any) {
    this.data = data;
    this.dataChangeObserver.emit(this.data); 
    return this.dataChangeObserver;
  } 
}

export class MyComponent  {
    constructor(private _global: GlobalService) {

     }

    addTag (id,desc){
       this._global.setData({ attr: 'some value' })
                 .subscribe((res)=>{this.myData=res},
                 err=>console.log(err),   //removed dot
                 ()=>console.log('recived data') //removed dot                    
                  );
     }
}