Kendo DataSource:如何定义“已计算"从远程odata源读取的数据的属性

问题描述

情况:

• kendo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.如果我要定义计算的"属性: OrderedDateRelative ，它应该是从今天(2013-02-25)到创建订单的日期(2013- 02-20)，例如:"5天前" ，我如何在客户端实现此目标?

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?

回答问题1: http://jsbin.com/ojomul/7/edit

问题2 -更新-

2.每个订单都有其嵌套属性OrderDetails，因此可以为嵌套OrderDetails属性定义一个计算字段吗?像:每个OrderDetail的 OrderDetailInfoCAndD ，值应该类似于: 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

教务长

推荐答案

您可以通过指定数据源的模型来创建计算字段:

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");
        }
      }
    }
  });

这是一个实时演示: http://jsbin.com/ojomul/1/edit

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