Angular4 组件通讯方法大全(推荐)

时间：2022-06-25 15:55:43 编辑：袖梨来源：一聚教程网

组件通讯，意在不同的指令和组件之间共享信息。如何在两个多个组件之间共享信息呢。

最近在项目上，组件跟组件之间可能是父子关系，兄弟关系，爷孙关系都有。。。。。我也找找了很多关于组件之间通讯的方法，不同的方法应用在不同的场景，根据功能需求选择组件之间最适合的通讯方式。下面我就总结一下关于组件通讯的N多种方法。

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


 
  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);
  }
}

结果：

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