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DropDown in filter

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Grid

This is a migrated thread and some comments may be shown as answers.

5 Answers, 1 is accepted

answered on 05 Jun 2010, 07:18 AM

Hello Silvio,

A better solution for creating columns with dropdown filters is by using 'FilterTemplate'. We can use a RadCombobox to select the available items on which to filter, and nest it in the filter template of a template column.

There are are two possible approaches to achieve this. In the first approach when the user selects an item in the combo, the SelectedIndexChanged client side handler is raised and invoke the filter command in the event handler. Another approach, is to use server side code to set the filter expression for the grid control manually.

You can refer the following documentation and demo for detail explanation on this.

Filter template
Grid / Filter Templates

Hope this information helps you,
Shinu.

answered on 16 Jul 2010, 03:48 PM

Hello

I am trying to add ItemTemplate, EditItemTemplate and FilterTemplate programmatically to the following grid depending on data type of the column.
For a list, there are classes defined like :

DropDownListItemTemplate

: ITemplate

DropDownListEditItemTemplate

: ITemplate, IBindableTemplate

DropDownListFilterItemTemplate

: ITemplate

and code like:

case "Lookup":

gridColumn.ItemTemplate =

new DropDownListItemTemplate(properties.DataField, luObject.GetType(), CurrentLOB);

gridColumn.EditItemTemplate =

new DropDownListEditItemTemplate(properties.DataField, luObject.GetType(), CurrentLOB);

gridColumn.FilterTemplate =

new DropDownListFilterItemTemplate(properties.DataField, luObject.GetType());

break;

The grid is rendered correctly with the drop down in the filter column. However if I click on Edit Icon, I get the following error:

Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.

If I remove the FilterTemplate and remove that line of code , everything works correctly. I can add and edit using the drop down in the edit template.

case "Lookup":

gridColumn.ItemTemplate =

new DropDownListItemTemplate(properties.DataField, luObject.GetType(), CurrentLOB);

gridColumn.EditItemTemplate =

new DropDownListEditItemTemplate(properties.DataField, luObject.GetType(), CurrentLOB);

break;

Here is the grid column declaration:
<

Columns>

<telerik:GridEditCommandColumn ButtonType="ImageButton"

UniqueName="EditControl" ItemStyle-HorizontalAlign="Center"

meta:resourcekey="GridEditCommandColumnResource1" >

</telerik:GridEditCommandColumn>

<telerik:GridBoundColumn Groupable="false" DataField="Code" DataType="System.String"

Visible="False" ReadOnly="true" UniqueName="Code"

meta:resourcekey="GridBoundColumnResource7" />