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Validate for duplicate field value on create/update action

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Olivier
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Olivier asked on 20 Nov 2020, 12:22 AM

Hello,

Sorry if this has already been asked, but I couldnt find a topic on that subject.

I would like to know if it's possible to validate for a duplicate value for a field when submitting an add/edit of a record in a grid (popup edit) and return an error in the form to inform the user that the value is already used.

I am able to do it in the appropriate handle after the submit but i can't seem to prevent the form to close and to display an error message to the user.

Thanks!

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Nadezhda Tacheva
Telerik team
answered on 24 Nov 2020, 06:02 PM

Hello Olivier,

In order to prevent the form from closing you need to modify the IsCancelled property of the event arguments in the update/edit handler. Setting its value to false will keep the grid in Insert/Edit mode and the PopUp will remain opened. This way you will also be able to display the necessary error message.

More information as well as a relevant example you can find in this article - https://docs.telerik.com/blazor-ui/components/grid/editing/overview and this sample project - https://github.com/telerik/blazor-ui/tree/master/grid/remote-validation

Regards,
Nadezhda
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