收集时模型触发的主干事件(双重触发) [英] Backbone events on model firing on collection (Double firing)

问题描述

我正在开发的一个 Backbone 应用程序有一个集合和一个模型，以及每个项目的关联视图.

https://gist.github.com/2255959

当我点击 PostView 时，意外地，事件在没有任何连接的情况下在集合上触发.

我想我需要将一个事件绑定到模型，然后让它在集合上触发一个事件.不是这样吗?集合是否会自动继承触发其子模型的事件?

我不确定，但我认为它与嵌套视图有关，也许事件被绑定在两个地方，而不仅仅是内部 el.

解决方案

出自精细手册:p><块引用>

为方便起见，在集合中的模型上触发的任何事件也将直接在集合上触发.

所以是的，集合会监听其所有模型上的事件并转发它们.

例如，给定这样一个简单的设置:

M 类扩展 Backbone.ModelC 类扩展 Backbone.Collection型号:Mc = 新 Cc.on('change', (model, opts) -> console.log('Change on collection'))

执行 c.first().set(...) 将触发事件处理程序.

演示:http://jsfiddle.net/ambiguous/wwjnK/

A Backbone app which I'm developing has a collection and a model, and associated views for each item.

https://gist.github.com/2255959

When I click on the PostView, unexpectedly, the event fires on the collection without any wiring.

I figured I'd need to bind an event to the model, then have that fire an event on the collection. Is that not the case? Does a collection automagically inherit events fired its child models?

I'm uncertain, but I think it has something to do with the nested views, and maybe the event is being bound on both places instead of just the inner el.

解决方案

From the fine manual:

Any event that is triggered on a model in a collection will also be triggered on the collection directly, for convenience.

So yes, the collection listens to events on all of its models and forwards them.

For example, given a simple set up like this:

class M extends Backbone.Model

class C extends Backbone.Collection
    model: M

c = new C
c.on('change', (model, opts) -> console.log('Change on collection'))

Doing c.first().set(...) will trigger the event handler.

Demo: http://jsfiddle.net/ambiguous/wwjnK/

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