Grid ForeignKey Column Filter Operators

[Rick]

I noticed that the filter for a foreignkey column is a dropdown and uses the "is equal" or "is not equal" operators.  Is it possible to have the foreignkey column filter to have the option of contains and/or use a combobox?

example column:  c.ForeignKey(p => p.LocationID, (SelectList)ViewData["LocationID_Data"]) .Title("Location").Width(250);

Thanks

[Alexander Valchev]

Hi Rick,

I am afraid that what you would like to achieve is not supported.

ForeignKey columns support only two filter operators - "Is equal to" and "Is not equal to". Kendo UI provides ability to remove one of them or modify the text displayed to the user. The syntax is:

.Filterable(
  filterable => filterable.Operators(
    operators=>operators.ForEnums(
      enums=>enums.Clear().IsEqualTo("corresponds to")
    )
  )
)

Regards,
Alexander Valchev
Telerik

[Rick]

Why is this? I want the "contains" operator. The foreignkey column has so much potential but seems to just fall short of anything useful.

[Petur Subev]

Hello Rick,

After all the ForeignKey column is  bound to a numeric field of your model. Which means that you are not actually able to filter with ComboBox because ComboBox can have free value from the user when no item from the collection is selected and this is not valid for the dataSource filtering and how it works..

If you want to have more flexibility you can create regular bound column, specify its template, its editor template and its filter menu UI so it does the same job as a regular ForeignKey column. All those settings are demonstrated separately in the documentation / demos.

http://docs.kendoui.com/api/web/grid#configuration-columns.template
http://docs.kendoui.com/api/web/grid#configuration-columns.editor
http://docs.kendoui.com/api/web/grid#configuration-columns.filterable.ui

http://demos.kendoui.com/web/grid/editing-custom.html
http://demos.kendoui.com/web/grid/filter-menu-customization.html


Kind Regards,
Petur Subev
Telerik

[Sergio]

thanks for the support, it works perfectly.

[Craig]

Would you mind providing a sample C# VS2017 project that demonstrates how to combine all of these techniques into one ?

Thank you !

[Stefan]

Hello, Craig,

As this is an old thread and some of the functionalities had changed, please share with us the use case and the desired end result.

This will help us provide specific information and example covering the real scenario.

This is how the ForeignKey column filter is working currently:

https://demos.telerik.com/aspnet-mvc/grid/foreignkeycolumn

This is the C# approach with the customization:

https://demos.telerik.com/aspnet-mvc/grid/filter-menu-customization

Regards,
Stefan
Progress Telerik