我有两个兄弟组件并排显示,比如说Component-A&组件-B。
Component-A有表单控件,一旦用户填写表单,我需要执行一些业务逻辑并将数据显示到Component-B中。
我创建了Service来共享数据。目前,当用户进行任何更改但是没有自动显示时,组件B可以使用组件B,我在组件B上放置了“刷新”按钮,当我点击按钮时,数据显示出来。
我想要实现的是从Component-A到Component-B的流畅数据流,无需任何用户点击。出于某种原因,我无法在Component-B中订阅该服务。
使用@angular版本~4.0.0
Nav.Service.ts
import { Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
@Injectable()
export class NavService {
// Observable navItem source
private _navItemSource = new BehaviorSubject<string>(null);
// Observable navItem stream
navItem$ = this._navItemSource.asObservable();
changeNav(query: string) {
this._navItemSource.next(query);
console.log("Inside changeNav",query )
}
}
组件-A
Private getSelectedComponents() {
this._navService.changeNav(this.searchValue) //dataFromControls is string data..
this.dataFromSisterComponent = '';
}
HTML:
<div class="form-group">
<div class="form-inline">
<label for="searchbox" class="control-label">Search : </label>
<input id="searchbox"class="form-control" type="text" #searchValue (keyup)="0"/>
<button class="btn btn-success" (click)="getSelectedComponents()">Add</button>
</div>
</div>
组件-B
import { Component, Input, Output, EventEmitter, ViewChild, OnInit, OnDestroy} from '@angular/core';
import { FormControl, FormGroup} from '@angular/forms';
import { DataService} from '../../Services/DataService/data.service';
import { Subscription } from 'rxjs/Subscription';
import { NavService } from '../../Services/NavService/nav.service';
@Component({
moduleId: module.id,
selector:'ComponentB',
templateUrl: 'Component-B.component.html',
})
export class Component-B implements OnInit {
subscription: Subscription;
dataFromComponentA: string;
shows: any;
error: string;
item: string;
constructor(private dataService: DataService,private _navService: NavService)
{
}
ngOnInit() {
this.getQuery();
}
getQuery() {
this.subscription = this._navService.navItem$
.subscribe(
item => this.item = item,
err => this.error = err
);
dataFromComponentA=this.item
console.log("Inside getquery",this.item )
}
ngOnDestroy() {
this.subscription.unsubscribe();
console.log("ngOnDestroy")
}
}
HTML
在下面的html中,我想自动显示数据 用户在ComponentA中进行更改时{{dataFromComponentA}}。目前 当我点击“刷新”按钮和我时,数据会显示出来 我想避免点击这个按钮。
<h3>Template Components 123 </h3>
<button class="btn btn-success" (click)="getQuery()">Refresh</button>
<p><b>Value coming from Component-A</b>
{{ dataFromComponentA }}
OK </p>
答案 0 :(得分:3)
您需要传递给subscribe
getQuery() {
this.subscription = this._navService.navItem$
.subscribe(
item => {
this.item = item,
dataFromComponentA=this.item
console.log("Inside getquery",this.item )
},
err => this.error = err
);
}