角2诺言/可观测链的两个事件？ [英] Angular 2 promise/observable chain two events?

问题描述

如果我想知道的观察到或诺可在下列情况下使用中使用角2：

I'm wondering if observable or promise can be used in the following use case in angular 2:

有两个异步上传任务。我想知道我怎么可以检测任务就完成了。

There are two asynchronized upload tasks. I'd like to know how I can detect both tasks are finished.

我的上传任务（在诺，但它很容易被更改为实施观察到如果需要的话）是这样的：

My upload task (implemented in promise but it's easily be changed to observable if needed) is like this:

myService.upload('upload1').then(() => {
})

myService.upload('upload2').then(() => {
})

如何将这两个事件一起链在任何的诺或可观测让我知道，这两个任务完成？谢谢

How to chain these two events together in either promise or observable so that I know both tasks are finished? Thanks

推荐答案

完整当所有的源流关闭被执行。

complete is executed when all the source stream are closed.

Rx.Observable.merge(
  myService.upload('upload1'),
  myService.upload('upload2').subscribe({complete: () => { ... });

如果你想设置结果的最大数量，以等待

if you want to set a max number of results to wait for

Rx.Observable.merge(
  myService.upload('upload1'),
  myService.upload('upload2')
.take(2)
.subscribe({complete: () => { ... });

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