如何从asObservable()获取数据

时间:2018-07-17 11:27:30

标签: angular observable angular2-observables query-parameters

这是我的服务代码,让服务名称为setGetContext

_params: Subject<any> = new Subject<any>();

getParameters(): Observable<SearchContext> {
    return this._params.asObservable();
}

setParameters(search: SearchContext) {
    this._params.next("Test");
}

在其他组件中,我试图获取params的值。

this.setGetContext.getParameters().subscribe((data) => {
    console.log(data);
})

这里我没有获取数据,甚至没有触发代码。

2 个答案:

答案 0 :(得分:4)

服务:

public _params: Subject<any> = new Subject<any>();
setParameters(search: SearchContext) {
  this._params.next({action:'test'});
}

组件:

import { Component, OnInit, OnDestroy } from '@angular/core';
import { Subscription } from 'rxjs';
import { Your service } from 'service_route'

export class YourComponent implements OnInit {
    public subscription: Subscription;

    constructor(private _serv: YourService) {}

    ngOnInit() {
       this.handleSubscriptions();
    }
    public handleSubscriptions() {
      this.subscription = this._serv._params.subscribe(
        action => {
            console.log(action);
        }
      )
    }
}

现在您可以调用服务功能,每次调用该功能时,组件都将console.log'test'

答案 1 :(得分:0)

您可以执行以下操作:

您的服务

import { Observable } from "rxjs/Observable";
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import { distinctUntilChanged, map } from 'rxjs/operators';

private _paramSubject = new BehaviorSubject<any>({} as any);
public _params = this._paramSubject.asObservable().pipe(distinctUntilChanged());

setParameters(search: SearchContext) {
    this._paramSubject.next("Test");
}

在组件中:

setParameters(<YOUR OBJECT>)
service._params.subscribe(data => {console.log(data)});