Backbone.js - 如何在模板中使用自定义模型属性? [英] Backbone.js - How to use a custom model property in a template?

问题描述

这可能是一个非常简单的问题，但我花了很多时间寻找答案.

This might be a really simple question but I'm having a heck of a time finding an answer.

使用主干，我有这条线:

Using backbone, I have this line:

Person = Backbone.Model.extend();

然后我在从 URL 填充的集合中使用它.举个例子，假设我有一个名字和姓氏，我想做这样的事情:

I then use that in a collection filled from a URL. For the sake of the example, say I have a first and last name, and I want to do something like:

Person = Backbone.Model.extend({
    FullName: this.get("firstName") + " " + this.get("lastName")
});

我可以使用例如 People.first().FullName() 调用内部主干.但是如果我将 People.first() 传递给我的视图并在模板中呈现它，它似乎不知道 FullName 是什么.

I can call that inside backbone using, for example, People.first().FullName(). But if I pass People.first() to my view and render that in a template, it seems to have no knowledge what FullName is.

如何将自定义属性添加到 Backbone 中的模型并在模板中使用它?

How would I add a custom property to a model in Backbone and use that inside a template?

干杯！

推荐答案

你的 FullName 定义没有任何意义，所以我假设你真的是这个意思:

Your FullName definition doesn't make any sense so I'm going to assume that you really meant this:

Person = Backbone.Model.extend({
    FullName: function() {
        return this.get("firstName") + " " + this.get("lastName");
    }
});

通常你会在你的模型上调用 toJSON 来序列化它们以供模板使用:

Usually you'll call toJSON on your models to serialize them for use by a template:

var html = template({ person: person.toJSON() })

默认的 toJSON 只返回一个模型内部属性的(浅)副本.据推测，这些属性将同时具有 firstName 和 lastName 属性，但 FullName 是模型上的一个函数，因此它不会出现在属性中.

The default toJSON simply returns a (shallow) copy of the model's internal attributes. The attributes will, presumably, have both firstName and lastName properties but FullName is a function on the model so it won't be in the attributes.

您可以提供自己的toJSON:

toJSON: function() {
    var j = _(this.attributes).clone();
    j.FullName = this.FullName();
    return j;
}

然后你的模板中有一个FullName.但是，toJSON 也用于序列化模型向服务器发送数据；您的服务器最终会看到 FullName 并且可能会对此感到不安.您可以专门为模板添加另一个序列化程序:

and then you'd have a FullName in your template. However, toJSON is also used to serialize the model to send data to the server; your server would end up seeing a FullName and it might get upset about that. You could add another serializer specifically for templates:

// `serialize` is another common name for this
for_template: function() {
    var j = this.toJSON();
    j.FullName = this.FullName();
    return j;
}

然后使用该函数为您的模板提供数据:

and then use that function to supply data for your templates:

var html = template({ person: person.for_template() });

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