Kendo DataSource: How to define “Computed” Properties for data read from remote odata source

Question

Situation:

• kendo DataSource

  var ordersDataSource = new kendo.data.DataSource({
      type: \"odata\",
      transport: {
          read: {
                  
  
  
          

Answer 1

Below an example to use it in a grid. It can then also sort the column.

$("#grid").kendoGrid({ 
    dataSource: {
        data: [
            { first: "John", last: "Doe" }, 
            { first: "Jane", last: "Doe" }
        ],
        schema: {
          model: {
            // Calculated field
            fullName: function() {
              return this.first + " " + this.last;
            },
            fields: {
               first: { type: "string" },
               last: { type: "string" }
            }
          }
        }
    },
    columns: [
        {
            // Trigger function of the Calculated field
            field: "fullName()",
            title: "Fullname"
        },
        {
            field: "first",
            title: "firstname"
        }
    ]
});

Answer 2

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");
        }
      }
    }
  });

Here is a live demo: http://jsbin.com/ojomul/1/edit

Answer 3

Here is a way to use calculated field in Kendo Grid.

var crudServiceBaseUrl = "http://demos.telerik.com/kendo-ui/service",
dataSource = new kendo.data.DataSource({
    transport: {
        read: {
            url: crudServiceBaseUrl + "/Products",
            dataType: "jsonp"
        }
    },
    pageSize: 20,
    schema: {
        model: {
            total: function (item) {
                return this.UnitPrice * this.UnitsInStock;
            }
        }
    }
});

$("#grid").kendoGrid({
    dataSource: dataSource,
    pageable: true,
    height: 550,
    sortable: true,
    filterable: true,
    toolbar: ["create"],
    columns: [
        { field: "UnitPrice", title: "Unit Price"},
        { field: "UnitsInStock", title: "Units In Stock", width: "120px" },
        { field: "total()", title: "Total" }]
});