使用Angular4怎么实现组件通讯-创新互联
使用Angular4怎么实现组件通讯?相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。
1.父→子 input
parent.ts
import { Component } from '@angular/core'; @Component({ selector: 'page-parent', templateUrl: 'parent.html', }) export class ParentPage { i: number = 0; constructor() { setInterval(() => { this.i++; }, 1000) } }
parent.html
Parent Parent
child.ts
import { Component,Input } from '@angular/core'; @Component({ selector: 'page-child', templateUrl: 'child.html', }) export class ChildPage { @Input() content:string; constructor() { } }
child.html
child:{{content}}
结果:
2.子→父 output
parent.ts
import { Component } from '@angular/core'; @Component({ selector: 'page-parent', templateUrl: 'parent.html', }) export class ParentPage { i: number = 0; numberIChange(i:number){ this.i = i; } }
parent.html
Parent Parent:{{i}}
child.ts
import { Component, EventEmitter, Output } from '@angular/core'; @Component({ selector: 'page-child', templateUrl: 'child.html', }) export class ChildPage { @Output() changeNumber: EventEmitter= new EventEmitter(); Number: number = 0; constructor() { setInterval(() => { this.changeNumber.emit(++this.Number); }, 1000) } }
child.html
child
结果:
3.子获得父实例
parent.ts
import { Component } from '@angular/core'; @Component({ selector: 'page-parent', templateUrl: 'parent.html', }) export class ParentPage { i:number = 0; }
parent.html
Parent parent: {{i}}
child.ts
import { Component, Input, EventEmitter, Output,Host,Inject,forwardRef } from '@angular/core'; import{ParentPage} from '../parent/parent'; @Component({ selector: 'page-child', templateUrl: 'child.html', }) export class ChildPage { constructor( @Host() @Inject(forwardRef(() => ParentPage)) app: ParentPage) { setInterval(() => { app.i++; }, 1000); } }
child.html
child
结果:
4.父获得子实例
parent.ts
import {ViewChild, Component } from '@angular/core'; import{ChildPage}from '../child/child'; @Component({ selector: 'page-parent', templateUrl: 'parent.html', }) export class ParentPage { @ViewChild(ChildPage) child:ChildPage; ngAfterViewInit() { setInterval(()=> { this.child.i++; }, 1000) } }
parent.html
Parent parent {{i}}
child.ts
import { Component, Input, EventEmitter, Output,Host,Inject,forwardRef } from '@angular/core'; @Component({ selector: 'page-child', templateUrl: 'child.html', }) export class ChildPage { i:number = 0; }
child.html
child {{i}}
结果:
5.service
parent.ts
import { Component } from '@angular/core'; import{myService}from '../child/myService' @Component({ selector: 'page-parent', templateUrl: 'parent.html', }) export class ParentPage { i:number=0; constructor(service:myService) { setInterval(()=> { service.i++; }, 1000) } }
parent.html
Parent parent {{i}}
child.ts
import { Component} from '@angular/core'; import{myService}from "../child/myService" @Component({ selector: 'page-child', templateUrl: 'child.html', }) export class ChildPage { constructor(public service:myService){ } }
child.html
child {{service.i}}
myService.ts
ps:记得在app.module.ts 加上providers: [KmyService]
import{Injectable } from '@angular/core'; @Injectable() export class KmyService { i:number = 0; }
结果:
6.EventEmitter
myService.ts
import {Component,Injectable,EventEmitter} from '@angular/core'; @Injectable() export class myService { change: EventEmitter; constructor(){ this.change = new EventEmitter(); } }
parent.ts
import { Component } from '@angular/core'; import{myService}from '../child/myService' @Component({ selector: 'page-parent', templateUrl: 'parent.html', }) export class ParentPage { i:number = 0; constructor(service:myService) { setInterval(()=> { service.change.emit(++this.i); }, 1000) } }
parent.html
Parent parent {{i}}
child.ts
import { Component, EventEmitter} from '@angular/core'; import{myService}from "../child/myService" @Component({ selector: 'page-child', templateUrl: 'child.html', }) export class ChildPage { i:number = 0; constructor(public service:myService){ service.change.subscribe((value:number)=>{ this.i = value; }) } }
child.html
child {{i}}
结果:
7.订阅
parent.ts
import { Component } from '@angular/core'; import{myService}from '../child/myService' @Component({ selector: 'page-parent', templateUrl: 'parent.html', }) export class ParentPage { i:number=0; constructor(public service:myService) { setInterval(()=> { this.service.StatusMission(this.i++); }, 1000) } }
parent.html
Parent parent
child.ts
import { Component, Injectable } from '@angular/core' import { myService } from "../child/myService" import { Subscription } from 'rxjs/Subscription'; @Component({ selector: 'page-child', templateUrl: 'child.html', }) export class ChildPage { i:number=0; subscription: Subscription; constructor(private Service: myService) { this.subscription = Service.Status$.subscribe(message => { this.i=message; }); } ngOnDestroy() { this.subscription.unsubscribe(); } }
child.html
child {{i}}
myService.ts
import { Injectable } from '@angular/core'; import { Subject } from 'rxjs/Subject'; @Injectable() export class myService { private Source=new Subject(); Status$=this.Source.asObservable(); StatusMission(message: any) { this.Source.next(message); } }
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