以角度 2 将整个对象从一个组件发送到另一个组件 [英] Sending whole object from one component to another in angular 2

问题描述

我有问题.我不知道如何将对象从一个组件发送到另一个组件.

I have a problem. I don't know how to send object from one component to another.

在第一个组件 cinema.component.html 中，我有以下函数调用:

In first component cinema.component.html I have following function call:

<a title="Reserve" (click)="openReservationPage(repertoire)">Reserve</a> 

在 cinema.component.ts 文件中，对于那个 .html 我有类似的东西:

In cinema.component.ts file, for that .html I have something like:

openReservationPage(repertoire: UpcomingRepertoire) {
    this.router.navigate(['/reserve', {repertoire: JSON.stringify(repertoire)}]);
}

我的 app.routes.ts 文件包含适当的路由:

My app.routes.ts file contains appropriate routing:

{ path: 'reserve', component: ReserveFormComponent }

如何在另一个页面 reserve-form.component.ts 和 reserve-form.component.html 中使用这个 repertoire 对象?

How can I use this repertoire object in another page reserve-form.component.ts and reserve-form.component.html ?

推荐答案

作为标题中问题的答案，我会说创建一个服务来在组件之间传递数据.

As an answer for the question in the title, i would said create a service to pass data between components.

由于它是一个路由器实现，您可以将曲目作为路由参数传递.

Since its a router implementation you can pass the repertoire as a route parameter.

请按照以下步骤操作:

1)修改app.routes.ts中的路由以带参数

{ path: 'reserve/:repertoire', component: ReserveFormComponent }

2)在cinema.component.ts中将曲目作为参数传递

this.router.navigate(['/reserve',JSON.stringify(repertoire)]‌​);

3)提取reserve-form.component.ts中的参数

首先你需要导入

 import {ActivatedRoute } from "@angular/router";

技术 1

repertoire:any;

constructor(private activatedRoute: ActivatedRoute) {
    this.repertoire = JSON.parse(activatedRoute.snapshot.params["repertoire"]);
  }

技术 2

import { Subscription } from "rxjs/Rx";

private subscription: Subscription;
repertoire:any;

constructor(private activatedRoute: ActivatedRoute) {
    this.subscription = activatedRoute.params.subscribe(
      (param: any) => this.repertoire = JSON.parse(param['repertoire'])
    );
  }

  ngOnDestroy() { // here we unsubscribe to the observable
    this.subscription.unsubscribe();
  }

进一步说明:

技术 1 当您确定每次导航到组件时都会传递参数.

Technique 1 is adopted when you are sure that the param will be passed every time you navigate to the component.

技术 2 是在发布参数后订阅 observable 但不要忘记在 ngOnDestroy() 组件的生命周期方法中取消订阅以防止内存泄漏.

Technique 2 is a subscription to the observable once there a param published but don't forget to unsubscribe in the ngOnDestroy() component's life cycle method to prevent memory leak.

这更可取，因为有时会出现在创建后将参数传递给组件的情况，其中快照方法不会捕获，并且与技术 1 中的基本情况相比，它在不同情况下更灵活.

It is more preferable because some times there a scenario that a param is passed to a component after it was created where the snapshot method wouldn't capture and it more flexible with different scenario than the basic one in technique 1.

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