angular4 共享服務在多個組件中數據通信的示例

2019-11-19 14:04:59

字體：大中小

來源：轉載

供稿：網友

應用場景，不同組件中操作統一組數據，不論哪個組件對數據進行了操作，其他組件中立馬看到效果。這樣他們就要共用一個服務實例，是本次的重點，如果不同實例，那么操作的就不是同一組數據，那么就不會有這樣的效果，想實現共用服務實例，就是在所有父組件中priviates:[]中引入這個組件，子組件中不需要再次引入，那么他們都是用的父組件中的服務實例。

1、公用服務

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

2、parent.component.ts

import {Component, OnInit} from "@angular/core";import {CommonService} from "./common.service";// 這里要通過父子公用服務來操作數據，只需要在父組件中引入服務。@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="彈窗" [(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>年齡：<input type="number" name="age" [(ngModel)]="age" pInputText/></p> <p>地址：<input type="text" name="address" [(ngModel)]="address" pInputText/></p> <button pButton label="確定" type="submit" (click)="addInfoFun()"></button> <button pButton label="取消" (click)="hideDialog()"></button> </form></p-dialog><button label="添加" pButton (click)="showDialog()"></button>