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Angular4 組件通訊方法大全(推薦)

 更新時間：2018年07月12日 15:17:09   作者：huangenai  
這篇文章主要介紹了Angular4 組件通訊方法大全(推薦)，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

組件通訊，意在不同的指令和組件之間共享信息。如何在兩個多個組件之間共享信息呢。

最近在項(xiàng)目上，組件跟組件之間可能是父子關(guān)系，兄弟關(guān)系，爺孫關(guān)系都有。。。。。我也找找了很多關(guān)于組件之間通訊的方法，不同的方法應(yīng)用在不同的場景，根據(jù)功能需求選擇組件之間最適合的通訊方式。下面我就總結(jié)一下關(guān)于組件通訊的N多種方法。

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

<ion-header>
 <ion-navbar>
  <ion-title>Parent</ion-title>
 </ion-navbar>
</ion-header>

<ion-content padding>
 <h2>Parent</h2>
 <page-child [content]="i"></page-child>
</ion-content>

child.ts

import { Component,Input } from '@angular/core';

@Component({
 selector: 'page-child',
 templateUrl: 'child.html',
})
export class ChildPage {
@Input() content:string;
 constructor() {
 }
}

child.html

<ion-content padding>
child:{{content}}
</ion-content>

結(jié)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

<ion-header>
 <ion-navbar>
  <ion-title>Parent</ion-title>
 </ion-navbar>
</ion-header>

<ion-content padding>
 <h2>Parent:{{i}}</h2>
 <page-child (changeNumber)="numberIChange($event)"></page-child>
</ion-content>

child.ts

import { Component, EventEmitter, Output } from '@angular/core';

@Component({
 selector: 'page-child',
 templateUrl: 'child.html',
})

export class ChildPage {
 @Output() changeNumber: EventEmitter<number> = new EventEmitter();
 Number: number = 0;
 constructor() {
  setInterval(() => {
   this.changeNumber.emit(++this.Number);
  }, 1000)
 }
}

child.html

<ion-content padding>
   child
</ion-content>

結(jié)果：

3.子獲得父實(shí)例

parent.ts

import { Component } from '@angular/core';

@Component({
 selector: 'page-parent',
 templateUrl: 'parent.html',
})
export class ParentPage {
 i:number = 0;
}

parent.html

<ion-header>
 <ion-navbar>
  <ion-title>Parent</ion-title>
 </ion-navbar>
</ion-header>

<ion-content padding>
 <h1>parent: {{i}}</h1>
 <page-child></page-child>
</ion-content>

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

<ion-content padding>
 child 
</ion-content>

結(jié)果：

4.父獲得子實(shí)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

<ion-header>
 <ion-navbar>
  <ion-title>Parent</ion-title>
 </ion-navbar>
</ion-header>

<ion-content padding>
 <h1>parent {{i}}</h1>
 <page-child></page-child>
</ion-content>

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

<ion-content padding>
<h2>child {{i}}</h2>
</ion-content>

結(jié)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

<ion-header>
 <ion-navbar>
  <ion-title>Parent</ion-title>
 </ion-navbar>
</ion-header>

<ion-content padding>
  <h1>parent {{i}}</h1>
  <page-child></page-child>
</ion-content>

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

<ion-content padding>
<h2>child {{service.i}}</h2>
</ion-content>

myService.ts

ps:記得在app.module.ts 加上providers: [KmyService]

import{Injectable } from '@angular/core';
@Injectable()
export class KmyService {
  i:number = 0;
}

結(jié)果：

6.EventEmitter

myService.ts

import {Component,Injectable,EventEmitter} from '@angular/core';
@Injectable()
export class myService {
  change: EventEmitter<number>;

  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

<ion-header>
 <ion-navbar>
  <ion-title>Parent</ion-title>
 </ion-navbar>
</ion-header>

<ion-content padding>
  <h1>parent {{i}}</h1>
  <page-child></page-child>
</ion-content>

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

<ion-content padding>
 <h2>child {{i}}</h2>
</ion-content>

結(jié)果：

7.訂閱

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

<ion-header>
 <ion-navbar>
  <ion-title>Parent</ion-title>
 </ion-navbar>
</ion-header>

<ion-content padding>
  <h1>parent</h1>
  <page-child></page-child>
</ion-content>

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

<ion-content padding>
 <h2>child {{i}}</h2> 
</ion-content>

myService.ts

import { Injectable } from '@angular/core';
import { Subject } from 'rxjs/Subject';

@Injectable()
export class myService {

  private Source=new Subject<any>();
  Status$=this.Source.asObservable();
  StatusMission(message: any) {
    this.Source.next(message);
  }
}

結(jié)果：

以上七種組件與組件的通訊方式，可以選擇應(yīng)用于適合的場景里面，根據(jù)情況吧。希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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