filtering +combobox with checkboxes

[Łukasz Kuryło]

Hi all.
I have a column where I have only three possible values. I want to create a filter column with checkboxes, when I can choose one (or more) of them. I have a radgrid populated using webservice+js, so I want to do it in pure js. For filtering other columns I using a dynamic linq. How can I do that?

[Łukasz Kuryło]

Ok, I have created this radcombobox with checkboxes

<telerik:GridBoundColumn    DataField="Producer"
                                                HeaderText="Producer"
                                                HeaderStyle-Width="120"
                                                ReadOnly="True"
                                                CurrentFilterFunction="Contains"
                                                AutoPostBackOnFilter="true"
                                                SortExpression="Producer"
                                                UniqueName="Producer">
                                                <FilterTemplate>
                                                    <telerik:RadComboBox    ID="rcbProducerFilter"
                                                                            runat="server"
                                                                            AppendDataBoundItems="true"
                                                                            EnableLoadOnDemand="true"
                                                                            EmptyMessage="All Types"
                                                                            OnClientItemDataBound="MyGrid.RadComboBoxTemplateItemDataBound"
                                                                            HighlightTemplatedItems="true"
                                                                            AllowCustomText="true"
                                                                            Width="95px"
                                                                            >
                                                                            <WebServiceSettings Method="GetProducers" Path="SampleData.asmx" />
                                                    </telerik:RadComboBox>
                                                    <div id="rcbProducerFilterTemplatePanel" class="templateRadComboBox">
                                                        <input name="chk1" type="checkbox" onclick="MyGrid.OnChange()"/>

                                                    </div>
                                                </FilterTemplate>
                    </telerik:GridBoundColumn>

MyGrid.RadComboBoxTemplateItemDataBound = function(sender, eventArgs)

{

var item = eventArgs.get_item();

var dataItem = eventArgs.get_dataItem();

dataItem.Index = item.get_index();

var template = new Sys.UI.Template($get("rcbProducerFilterTemplatePanel"));

template.instantiateIn(item.get_element(), dataItem);

}

But I have a problem, how to bound the selected values to the build-in filtering?
I would like to use
var filterExpressions = masterTable.get_filterExpressions();
    filter = filterExpressions.toDynamicLinq();
and get these values in that way.

[Tsvetoslav]

Hello Łukasz,

If you are binding the grid through a web-service (client-side databinding) you cannot use the build-in filtering as it is server-side based. What you need to do is to intercept the selected-index changed event of the combo or any other event that you need, issue a call to the web service with information on the filtering criteria and rebind the grid.

Our online example on client-side databinding uses the same implementation approach (although it appears to be using the built-in filtering, actually it does not - the OnCommand event is what does the trick):

http://demos.telerik.com/aspnet-ajax/grid/examples/client/databinding/defaultcs.aspx

I hope this helps. 

All the best,
Tsvetoslav
the Telerik team

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