Question

我正在玩Backbone，正在经历一些我不太了解的事情：

1）我在“data / applications.js”中创建了一些模拟数据

[
  {
    "id": "1",
    "title": "Title #1",
    "image": "some/path1"
  },
  {
    "id": "2",
    "title": "Title #2",
    "image": "some/path2"
  },
  {
    "id": "3",
    "title": "Title #3",
    "image": "some/path4"
  },
  {
    "id": "4",
    "title": "Title #4",
    "image": "some/path4"
  }
]

2）我试图在集合中检索单个“应用程序”

ApplicationModel = Backbone.Model.extend({});

ApplicationCollection = Backbone.Collection.extend({
  url: "data/applications.json",
  model: ApplicationModel
});

var applications = new ApplicationCollection();
applications.fetch();
var application = applications.get(applicationId); // I get this from route

console.log(applicationId); // returns 2
console.log(applications); // returns the collection with 4 models
console.log(application); // returns undefined

我有一种感觉我错过了什么？

Answer 1

当您使用Backbone获取数据时，它是异步完成的，这意味着您的脚本在获取时继续执行。要检索您的应用程序，您必须等待提取结束：

applications.fetch({success: function() {
        console.log(applications.get(applicationId));
}});

Backbone：从集合中获取模型

1 个答案: