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Filtering data at WebGrid 7 with ClientBinding, Paging and ISLinqDatasource

Glayaar — Mon, 02 Nov 2009 02:19:08 GMT

In a ClientBindind scenario, please use ClientBindingSettings ServiceEvents Selecting to add custom filter. This way the filter argument will be used during the data selecting (Paging will be taken into account)

Using the ClientBinding_Paging.aspx sample, add ServiceEvents Selecting. WebGrid Definition:

<ClientBindingSettings DataLoadMode="PagedData" DataSourceType="WebService" ItemTypeName="Bug"
    ServiceUrl="WebService.asmx">
    <ServiceMethods BatchUpdateMethod="UpdateBugs" SelectMethod="GetPagedBugs" />
    <ServiceEvents Selecting="WebGrid1_DataSelecting" />
</ClientBindingSettings>

Here is the event handler snippet, all filter action will filter the data which has Target value similar to fut or bug:

function WebGrid1_DataSelecting(gridObj, selectArgs) {
    if (selectArgs.FilterExpression != "")
        selectArgs.FilterExpression = "[Target] like 'fut' or [Target] like 'bug'";
}

Filtering data at WebGrid 7 with ClientBinding, Paging and ISLinqDatasource

somer@optima.com.tr — Fri, 23 Oct 2009 06:12:21 GMT

I have a webgrid with clientbinding and paging which is connected a ISLinqDataSource (Datasource is Entity Framework).

I would like to return filtered data, but i cant use "filter column" property because of the design and security issues (for example: user may unhide hidden column and clear filter, or i can't apply more than one filter for a single column like "code like 'a%' or code like 'b%' ").

And i cant use ISLinqDataSource's where property as WebGrid overrides it.

So i dediced to use FilteredColumns.AdvancedFilterExpression property.

It runs but has one important problem:

AdvancedFilterExpression is applied not while querying database, but applied after retrieving data by WebGrid. So if you set paging with 25 rows, you may see less than 25 rows in a pages, even may be all pages with no rows.