将对象从一个组件移动到Angular5中的同级组件
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我正在开发一个列表应用程序,它将一个对象从一个组件传输到一个相同的兄弟组件。我还希望每次移动时将移动属性减少1。我实际上将所选项目推入兄弟阵列时遇到问题。
这是我的数据样本......
import { player } from "./player";
export const PLAYERS: player[] = [
{
index: 1,
photo: "../../assets/images/lonzo.jpeg",
name: "Lonzo Ball",
position: "G",
moves: 5
},
{
index: 2,
photo: "../../assets/images/Brook.jpeg",
name: "Brook Lopez",
position: "C",
moves: 5
},
这就是我在服务文件中的内容......
import { Injectable } from "@angular/core";
import { BehaviorSubject } from "rxjs/BehaviorSubject";
import { Subject } from 'rxjs/Subject';
import { player } from "./player";
import { PLAYERS } from "./players";
import 'rxjs/add/observable/of';
import { Observable } from "rxjs/Observable";
import { of } from "rxjs/observable/of";
import { bench } from './bench';
import { RESERVES } from './RESERVES';
@Injectable()
export class DataService {
public players = <any>PLAYERS;
public bench = <any>RESERVES;
public getPlayers(): Observable<player[]> {
return Observable.of(this.players);
}
public getReserves(): Observable<bench[]> {
return Observable.of(this.bench);
}
addToReserves(data) {
this.bench.next(data);
}
addToStarter(data) {
this.players.next(data)
}
constructor() {}
}
这就是我在starters.ts文件中的内容......
import { Component, OnInit } from "@angular/core";
import { DataService } from '../data.service'
import { player } from "../player";
@Component({
selector: "app-roster-box",
templateUrl: "./roster-box.component.html",
styleUrls: ["./roster-box.component.css"],
})
export class RosterBoxComponent implements OnInit {
moves: number = 5;
btnText: string = "Move to Bench";
players: Array<any>
constructor(public dataService: DataService) {}
getPlayers() : void {
this.dataService.getPlayers()
.subscribe(players => this.players = players);
}
ngOnInit() {
this.getPlayers();
}
moveToBench( data, i): void {
this.dataService.addToReserves(data)
// this.players.splice(i, 1);
}
}
最后是bench.ts文件的代码......
import { Component, OnInit } from '@angular/core';
import { DataService } from '../../app/data.service'
import { bench } from "../bench";
@Component({
selector: 'app-roster-bench',
templateUrl: './roster-bench.component.html',
styleUrls: ['./roster-bench.component.css']
})
export class RosterBenchComponent implements OnInit {
moves: number = 5;
btnText: string = "Make Starter";
reserves: Array<any>;
constructor(private dataService: DataService) { }
getReserves() : void {
this.dataService.getReserves()
.subscribe(reserves => this.reserves = reserves);
}
ngOnInit() {
this.getReserves();
// this.moveData();
}
makeStarter( data, i): void {
this.dataService.addToStarter(data)
// this.players.splice(i, 1);
}
}
我只想单击html中的按钮将所选播放器移动到兄弟组件。我在如何构建服务/可观察等方面遇到了麻烦,因为这是我第一次使用Angular。
我有一点空闲时间...所以我把你的示例代码移到了stackblitz:https://stackblitz.com/edit/angular-j2l8pq
我不确定你想要完成什么,但试图基本回答你的问题。
一些关键的事情:
1)我认为替补席和球员阵列都需要是Player
类型。这允许您在两个数组之间移动相同类型的项而不会丢失任何属性。
2)我将组件中的属性更改为getter。这样它总是从服务获得当前值:
get players(): Player[] {
return this.dataService.players;
}
get bench(): Player[] {
return this.dataService.bench;
}
3)您似乎不需要Subject / BehaviorSubject,因此我删除了导入。
我不确定你指的是什么“兄弟组件”。但是如果你创建另一个与同一服务对话的组件,如果它还有一个如上所示的getter,它将与播放器组件共享相同的数据。
希望提供的代码为您提供回答问题的基本方向。
零件
import { Component, OnInit } from "@angular/core";
import { DataService } from './player.service'
import { Player } from "./player";
@Component({
selector: 'app-roster-box',
template:
`<div>Current Roster</div>
<li *ngFor="let player of players" (click)="moveToBench(player)">
{{ player.name }}
</li>
<br>
<div>Bench</div>
<li *ngFor="let player of bench">
{{ player.name }}
</li>
`
})
export class RosterBoxComponent implements OnInit {
moves: number = 5;
btnText: string = "Move to Bench";
get players(): Player[] {
return this.dataService.players;
}
get bench(): Player[] {
return this.dataService.bench;
}
constructor(public dataService: DataService) {}
getPlayers() : void {
this.dataService.getPlayers()
.subscribe();
}
ngOnInit() {
this.getPlayers();
}
moveToBench( player ): void {
console.log(player);
this.dataService.addToReserves(player)
}
}
服务
import { Injectable } from "@angular/core";
import { Player } from "./player";
import { Observable } from "rxjs/Observable";
import { of } from "rxjs/observable/of";
@Injectable()
export class DataService {
players: Player[] = [];
bench: Player[] = [];
constructor() {}
getPlayers(): Observable<Player[]> {
this.players = [
{
index: 1,
photo: "../../assets/images/lonzo.jpeg",
name: "Lonzo Ball",
position: "G",
moves: 5
},
{
index: 2,
photo: "../../assets/images/Brook.jpeg",
name: "Brook Lopez",
position: "C",
moves: 5
}
]
return of(this.players);
}
getReserves(): Observable<Player[]> {
return of(this.bench);
}
addToReserves(player: Player) {
this.bench.push(player);
const index = this.players.indexOf(player);
if (index > -1)
this.players.splice(index, 1);
}
addToStarter(data) {
this.players.push(data)
}
}
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