Kendo DataSource: How to set filters before fetch without sending two httprequests

Question

Environment:

• kendo version: 2013.1.319

• dataSource:

  productsDataSource = new kendo.data.DataSource({
      type: "odata",
      transport: {
          read: "http://www.mydomain.com/odata.svc/products",
          dataType: "json",
          contentType: "application/json"
      }
      schema: {
          type: "json",
          data: function(data){
              return data.value;
          },
          total: function(data){
              return data['odata.count'];
          },
          model: product
      },
      pageSize: 50,
      serverPaging: true,
      serverFiltering: true,
      serverSorting: true
  });
  

• Get data:

  productsDataSource.filter([{ field: "Id", operator: "eq", value: 5 }]); //this will send an httprequest

  productsDataSource.fetch(function (e) { tempDataStorage = e.items; //more logic to dealing with the data; });

• problems:

  1. need to use the fetch method of the dataSource for data processing(widgets initialization, data binding...etc);
  2. avoid sending two httprequests when setting filters before fetch;
  3. the filter condition need to be changed at runtime.

Answer 1

productsDataSource._filter = { logic: 'and', filters: [
{ field: "Id", operator: "eq", value: 5 }]};

I've found this to work. Set the internal property to a full filter object. You can then call fetch afterwards. I've not yet found a way to change the page size without triggering a fetch however.