meteor 订阅回调

Question

根据这里的这篇文章:

https://dweldon.silvrback.com/common-mistakes

Subscriptions don't block

Many aspects of the framework seem like magic. So much so that it may cause you to forget how web browsers work. Take this simple example:

Meteor.subscribe('posts');

var post = Posts.findOne();

The idea that post will be undefined is the root cause of roughly one in twenty meteor questions on stackoverflow.

那么为什么订阅没有回调，如果有，为什么 meteor 文人没有更频繁地引用它？

为什么我们没有:

Meteor.subscribe('posts', function(err, posts){

//when the items/posts actually arrive

}); 

我希望我的问题是有道理的。

Answer 1

也许我没明白这个问题，但 Meteor.Subscribe 函数有名为 onError 和 onReady 方法的回调。

Optional. May include onError and onReady callbacks. If a function is passed instead of an object, it is interpreted as an onReady callback.

From docs.

例如。

Meteor.subscribe("posts", {
  onReady: function () { console.log("onReady And the Items actually Arrive", arguments); },
  onError: function () { console.log("onError", arguments); }
});

另请检查此 GitHub issue