如何从asObservable()获取数据 [英] How to get data from asObservable()

问题描述

这是我的服务代码，让服务名称为setGetContext

this my service code, let the service name be 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.

In the other component i'm trying to get the value of params.

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.

Here I'm not getting data and the code is not even triggered.

推荐答案

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'

Now you can call your service function and everytime you call it your component will console.log 'test'

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