anguar4 共享服務在多個元件中資料通信

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，那麼操作的就不是同一組數據，那麼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 :[]中引入這個元件，子元件中不需要再次引入，那麼他們都是用的父元件中的服務實例。

1、公用服務

import {Injectable} from "@angular/core";

@Injectable()
export class CommonService {
    public dateList: any = [
        {
            name: "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>

############################### #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，那麼操作的就不是同一組數據，那麼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 :[]中引入這個元件，子元件中不需要再次引入，那麼他們都是用的父元件中的服務實例。 ######1、公用服務###

import {Injectable} from "@angular/core";

@Injectable()
export class CommonService {
    public dateList: any = [
        {
            name: "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>

####################

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