Angular ngIf-表达式在检查后已更改。以前的值:';ngIf:false';。当前值:';ngIf:true';
当方法没有父子关系时,如何从一个组件调用另一个组件 我有两个兄弟组件,如下所示: 标题.tsAngular ngIf-表达式在检查后已更改。以前的值:';ngIf:false';。当前值:';ngIf:true';,angular,typescript,angular5,Angular,Typescript,Angular5,当方法没有父子关系时,如何从一个组件调用另一个组件 我有两个兄弟组件,如下所示: 标题.ts private postValues() { this._PartService.PostDataValues(this.search) .subscribe(result => { }) } 第1部分 this._PartService.getMasterData() .subscribe(result => { }) 在这种情况下,我
private postValues() {
this._PartService.PostDataValues(this.search)
.subscribe(result => {
})
}
第1部分
this._PartService.getMasterData()
.subscribe(result => {
})
在这种情况下,我需要将
postValues()
方法调用到getMasterData()
中以获取一些描述值,并且它没有父级和子级通信。不可能直接触发同级组件方法,但有一种方法可以使用导入{BehaviorSubject}来触发同级组件事件来自‘rxjs’代码>
import { Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs';
@Injectable()
export class DataService {
private triggerEventMsg = new BehaviorSubject(false);
triggerEvent = this.triggerEventMsg.asObservable();
constructor() { }
triggerEvent(val: boolean) {
this.messageSource.next(message)
}
}
import { Component, OnInit } from '@angular/core';
import { DataService } from "../data.service";
@Component({
selector: 'app-com1',
template: `
{{message}}
<button (click)="newMessage()">New Message</button>
`
})
export class Com1 implements OnInit {
constructor(private data: DataService) { }
ngOnInit() {
}
com1ClickEvent() {
this.data.triggerEvent(true);
}
}
import { Component, OnInit } from '@angular/core';
import { DataService } from "../data.service";
@Component({
selector: 'app-com2',
template: `
<p>Com2</p>
`
})
export class Com2 implements OnInit {
constructor(private data: DataService) { }
ngOnInit() {
this.data.triggerEventMsg.subscribe(message => {
// Do What ever you want.
})
}
}
我使用这种方法将数据传递给同级组件,但若您触发事件,它也可以工作。
首先创建服务,我称之为DataService.ts
import { Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs';
@Injectable()
export class DataService {
private triggerEventMsg = new BehaviorSubject(false);
triggerEvent = this.triggerEventMsg.asObservable();
constructor() { }
triggerEvent(val: boolean) {
this.messageSource.next(message)
}
}
import { Component, OnInit } from '@angular/core';
import { DataService } from "../data.service";
@Component({
selector: 'app-com1',
template: `
{{message}}
<button (click)="newMessage()">New Message</button>
`
})
export class Com1 implements OnInit {
constructor(private data: DataService) { }
ngOnInit() {
}
com1ClickEvent() {
this.data.triggerEvent(true);
}
}
import { Component, OnInit } from '@angular/core';
import { DataService } from "../data.service";
@Component({
selector: 'app-com2',
template: `
<p>Com2</p>
`
})
export class Com2 implements OnInit {
constructor(private data: DataService) { }
ngOnInit() {
this.data.triggerEventMsg.subscribe(message => {
// Do What ever you want.
})
}
}
现在一个组件触发另一个组件,现在,Com1触发Com2事件
带有传递布尔值的Com1触发器DataService triggerEvent
Com1.component.ts
import { Injectable } from '@angular/core';
import { BehaviorSubject } from 'rxjs';
@Injectable()
export class DataService {
private triggerEventMsg = new BehaviorSubject(false);
triggerEvent = this.triggerEventMsg.asObservable();
constructor() { }
triggerEvent(val: boolean) {
this.messageSource.next(message)
}
}
import { Component, OnInit } from '@angular/core';
import { DataService } from "../data.service";
@Component({
selector: 'app-com1',
template: `
{{message}}
<button (click)="newMessage()">New Message</button>
`
})
export class Com1 implements OnInit {
constructor(private data: DataService) { }
ngOnInit() {
}
com1ClickEvent() {
this.data.triggerEvent(true);
}
}
import { Component, OnInit } from '@angular/core';
import { DataService } from "../data.service";
@Component({
selector: 'app-com2',
template: `
<p>Com2</p>
`
})
export class Com2 implements OnInit {
constructor(private data: DataService) { }
ngOnInit() {
this.data.triggerEventMsg.subscribe(message => {
// Do What ever you want.
})
}
}
与非父子组件通信。所以我是通过服务来沟通的 服务台
value=false;
search: EventEmitter < boolean > = new EventEmitter();
toggle() {
this.value = !this.value;
this.search.emit(this.value);
}
Home.ts
ngOnInit() {
this.service.change.subscribe(value => {
//some code here
}
}
我的解决办法是使用
ngAfterViewChecked(){
this.cdRef.detectChanges();
}
在您得到错误的组件中在部分服务中新建一个header实例,然后调用它的postValues方法。很抱歉,我没有得到您的消息..如何做参考此