angular4 共享服务在多个组件中数据通信的示例

2019-11-19 14:04:59

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应用场景，不同组件中操作统一组数据，不论哪个组件对数据进行了操作，其他组件中立马看到效果。这样他们就要共用一个服务实例，是本次的重点，如果不同实例，那么操作的就不是同一组数据，那么就不会有这样的效果，想实现共用服务实例，就是在所有父组件中priviates:[]中引入这个组件，子组件中不需要再次引入，那么他们都是用的父组件中的服务实例。

1、公用服务

import {Injectable} from "@angular/core";@Injectable()export class CommonService { public dateList: any = [ {  name: "张旭超",  age: 20,  address: "北京市朝阳区" } ]; constructor() { } addDateFun(data) { this.dateList.push(data); }}

2、parent.component.ts

import {Component, OnInit} from "@angular/core";import {CommonService} from "./common.service";// 这里要通过父子公用服务来操作数据，只需要在父组件中引入服务。@Component({ selector: "parent-tag", templateUrl: "parent.component.html", providers: [ CommonService ]})export class ParentComponent implements OnInit { public list: any = []; constructor(private commonService: CommonService) { this.list = commonService.dateList; } ngOnInit() { }}

3、parent.component.html

<table width="500"> <tr *ngFor="let item of list"> <td>  {{item.name}} </td> <td>  {{item.age}} </td> <td>  {{item.address}} </td> </tr></table><child-one-tag></child-one-tag>

4、child-one.component.ts

import {Component} from "@angular/core";import {CommonService} from "./common.service";@Component({ selector: "child-one-tag", templateUrl: "child-one.component.html"})export class ChildOneComponent { public display: boolean = false; public username: string = ""; public age: number = 20; public address: string = ""; constructor(public commonService: CommonService) { } showDialog() { this.display = true; } hideDialog() { this.display = false; } addInfoFun() { let params = {  name: this.username,  age: this.age,  address: this.address }; this.commonService.addDateFun(params); params = {}; }}

5、child-one.component.html

<p-dialog header="弹窗" [(visible)]="display" [width]="300" appendTo="body" modal="modal"> <form #myForm="ngForm" name="myForm"> <p>姓名：<input type="text" name="username" [(ngModel)]="username" pInputText/></p> <p>年龄：<input type="number" name="age" [(ngModel)]="age" pInputText/></p> <p>地址：<input type="text" name="address" [(ngModel)]="address" pInputText/></p> <button pButton label="确定" type="submit" (click)="addInfoFun()"></button> <button pButton label="取消" (click)="hideDialog()"></button> </form></p-dialog><button label="添加" pButton (click)="showDialog()"></button>