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

问题

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.

回答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.

回答2:

You can user filter in the DataSource configuration. This should issue only one request with the filtering conditions that you specify in the DataSource configuration.

回答3:

Set the _filter field in the dataSource using productsDataSource._filter = [{ field: "Id", operator: "eq", value: 5 }]; and then manually initiate the request for remote data when you are ready using productsDataSource.read();

回答4:

Even though it is an old question, it comes in google results. So even though I don't know if it is valid for kendo version: 2013.1.319, but there is currently a method

dataSource.query({
  sort: { field: "ProductName", dir: "desc" },
  page: 3,
  pageSize: 20
});

This can set multiple options like sort, filter paging etc in a single call and returns a promise.

http://docs.telerik.com/kendo-ui/api/javascript/data/datasource#methods-query

回答5:

Bind event listener to datasource which initializes widget and then use filter method.

datasource.one('requestEnd', function(){
   // initialize or/and bind widget
});
datasource.filter({ /*your filter*/ })

来源：https://stackoverflow.com/questions/15635245/kendo-datasource-how-to-set-filters-before-fetch-without-sending-two-httpreques

标签

kendo-ui

datasource

odata