骨干JS：在其他意见，可以一个视图触发更新？

问题描述

在我简单的项目，我有2次 - 行项目视图（品牌）和应用程序。我重视功能，可以选择多个项目：

In my simple project I have 2 views - a line item view (Brand) and App. I have attached function that allows selecting multiple items:

var BrandView = Backbone.View.extend({
...some code...
    toggle_select: function() {
        this.model.selected = !this.model.selected;
        if(this.model.selected) $(this.el).addClass('selected');
        else $(this.el).removeClass('selected');
        return this;
    }
});

var AppView = Backbone.View.extend({
...some code...
    delete_selected: function() {
        _.each(Brands.selected(), function(model){ 
            model.delete_selected();
        });
        return false;
    },
});

事情是，我想知道有多少项被选中。在这种设置中选择不影响模型，因此不会触发任何事件。而从MVC的概念我理解的观点不应该被直接对话的视图。那么，怎样才能APPVIEW知道什么是BrandViews被选中？

Thing is, I want to know how many items are selected. In this setup selecting is NOT affecting the model and thus not firing any events. And from MVC concept I understand that views should not be directly talking to other views. So how can AppView know that something is being selected in BrandViews?

更确切地说，我APPVIEW知道有多少项被选中，所以如果选择大于1，我显示了多重选择的菜单。

And more specifically, I AppView to know how many items were selected, so if more than 1 is selected, I show a menu for multiple selection.

推荐答案

您可能希望有骨干的pub / sub事件本次讨论的读：

You might want to have a read of this discussion of Backbone pub/sub events:

http://lostechies.com/derickbailey/2011/07/19/references-routing-and-the-event-aggregator-coordinating-views-in-backbone-js/

我喜欢在添加它作为一个全球性事件机制：

I like to add it in as a global event mechanism:

Backbone.pubSub = _.extend({}, Backbone.Events);

然后在一个视图中，您可以触发事件：

Then in one view you can trigger an event:

Backbone.pubSub.trigger('my-event', payload);

和在另一个你可以听：

Backbone.pubSub.on('my-event', this.onMyEvent, this);

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