剑道数据源:如何定义“计算"从远程 odata 源读取的数据的属性 [英] Kendo DataSource: How to define "Computed" Properties for data read from remote odata source

问题描述

情况:

• 剑道数据源

• kendo DataSource

var ordersDataSource = new kendo.data.DataSource({
    type: "odata",
    transport: {
        read: {
            url: "http://localhost/odata.svc/Orders?$expand=OrderDetails"
        }
    },
    schema: {
        type: "json",
        data: function(response){
            return response.value;
        }
        total: function(response){
            return response['odata.count'];
        }
    },
    serverPaging: true,
    serverFiltering: true,
    serverSorting: true
})

从odata源读取的json数据如下:

the json data read from the odata source is like:

{
    odata.metadata: "xxxx",
    odata.count: "5",
    value: [
        {
            OrderId: 1,
            OrderedDate: "2013-02-20",
            OrderInfoA: "Info A",
            OrderInfoB: "Info B"
            OrderDetails: [
                {
                    OrderDetailId: 6,
                    OrderDetailInfoC: "Info C",
                    OrderDetailInfoD: "Info D"
                },
                {
                    //Another OrderDetail's data
                }
            ]
        },
        {
            // Another Order's data
        }
    ]
}

问题 1:

1.如果我想定义一个计算"属性:OrderedDateRelative，它应该是今天(2013-02-25)和订单创建日(2013-02-20)，例如:5 天前"，我如何在客户端实现这一点?

1.If I wanna define a "computed" property: OrderedDateRelative, which should be the number of days between Today(2013-02-25) and the Day the Order was Created(2013-02-20), Like: "5 days ago", HOW can i achieve this in the client side?

问题 1 的答案:http://jsbin.com/ojomul/7/edit

问题 2 --更新--

2.每个订单都有自己的嵌套属性OrderDetails，那么是否可以为嵌套的OrderDetails属性定义一个计算字段?比如:OrderDetailInfoCAndD，对于每个OrderDetail，其值应该是:OrderDetailInfoC + OrderDetailInfoD，即Info C Info D"?

2.Every Order has its Nested Property OrderDetails, so is it possible to define a Calculated Field for the Nested OrderDetails Property? Like: OrderDetailInfoCAndD for each OrderDetail, and the value should be something like: OrderDetailInfoC + OrderDetailInfoD, which is "Info C Info D"?

谢谢，

院长

推荐答案

可以通过指定数据源的model来创建计算字段:

You can create a calculated field by specifying the model of the data source:

  dataSource = new kendo.data.DataSource({
    data: [
      { first: "John", last: "Doe" }, 
      { first: "Jane", last: "Doe" }
    ],
    schema: {
      model: {
        // Calculated field
        fullName: function() {
          return this.get("first") + " " + this.get("last");
        }
      }
    }
  });

这是一个现场演示:http://jsbin.com/ojomul/1/edit

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