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TValue for ValueExpression

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Rihen
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Rihen asked on 11 May 2020, 07:20 AM

Hello,

I'm currently using a TextBox in one of my forms.

The problem is that the "Value" of the text box is made from a combinaison of different variables, with "ToString()", I cannot bind it to a specific string value.

The [Required] attribute is on a class, which does not contain a string value.

The purpose would be to be able to link "ValueExpression" to any variable like you can do with the validation message "  <ValidationMessage For="@AnyTypeRequiredValue"/>". Like this we will be able to have the field colored in red when the class is not filled and when it's not necesseraly a string.

Hope you understood my problem.

Have a nice day

 

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Marin Bratanov
Telerik team
answered on 11 May 2020, 12:57 PM

Hello,

The Blazor validation uses DataAnnotation attributes on the corresponding model fields - if the certain field does not have an attribute, it won't show error messages or block form submission.

If you can't have an appropriate field, you should create a view model that does. For example, its getter can perform the necessary calculations, or you could perform them elsewhere in the view-model and set its value as desired.

The TelerikTextbox requires a string field to bind to, like the standard <InputText /> - once you have the desired setup working with the InputText, it should work with the Telerik textbox.

 

Regards,
Marin Bratanov
Progress Telerik

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Marin Bratanov
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