Combining Blazor with Bootstrap for seamless form validation

After gaining some experience with Razor, I decided to explore Blazor. However, I encountered a familiar challenge - integrating validation with Bootstrap. The issue lies in the mismatch between Blazor's validation result classes and those of Bootstrap.

In the past, I was able to override class names in Razor by adding specific code to the _ValidationScriptsPartial.cshtml file:

const settings = {
    valid: 'is-valid',
    invalid: 'is-invalid'
    /* additional classes can be included here */
}
$.validator.setDefaults(settings)
$.validator.unobtrusive.options = settings

While searching for solutions, I discovered that many resources suggested simply copying Bootstrap styles and substituting class names (such as this example). Is there a more efficient approach to achieve this integration without duplicating all Bootstrap validation styles? I would prefer to avoid this method as it would entail repetition whenever Bootstrap is updated.

It's puzzling that the default Blazor app template is pre-configured to cooperate with Bootstrap, making this discrepancy all the more surprising.

Answer №1

Learn how to implement custom validation CSS class attributes in .NET 8 Blazor and Bootstrap v5 by following these steps:

To start, create a new class that inherits from FieldCssClassProvider and make sure to override the GetFieldCssClass method:

public class BootstrapValidationFieldClassProvider : FieldCssClassProvider
{
    public override string GetFieldCssClass(EditContext editContext, in FieldIdentifier fieldIdentifier)
    {
        bool isValid = editContext.IsValid(fieldIdentifier);
        bool isModified = editContext.IsModified(fieldIdentifier);

        // Blazor vs. Bootstrap:
        // isvalid = is-valid
        // isinvalid = is-invalid

        return $"{(isModified ? "modified " : "")}{(isValid ? "is-valid" : "is-invalid")}";
    }
}

In the OnInitialized method, call SetFieldCssClassProvider on your EditContext and pass in an instance of the class you just created:

private EditContext? editContext;

[SupplyParameterFromForm(FormName = "Form")]
private YourModel Model { get; set; } = new();

protected override void OnInitialized()
{
    editContext = new(Model);
    editContext.SetFieldCssClassProvider(new BootstrapValidationFieldClassProvider());
}

Finally, ensure that your EditForm is using the specified EditContext:

<EditForm EditContext="@editContext" FormName="Form">
<DataAnnotationsValidator />

@* Add your form contents here... *@

<ValidationSummary />
</EditForm>

Answer №2

Just stumbled upon this segment in the manual. I tried it out with is-valid and is-invalid classes, and it did the trick.

Additionally, I came across this fantastic article on how to incorporate a custom ValidationMessage in just 25-30 lines of code.

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