Combine ValidationSummary class attribute with custom classes#66364
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KitKeen wants to merge 3 commits into
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Combine ValidationSummary class attribute with custom classes#66364KitKeen wants to merge 3 commits into
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When a class attribute is supplied to <ValidationSummary /> via attribute splatting, append it to the built-in validation-errors class instead of replacing it. This matches the pattern used in InputBase, InputRadio, and QuickGrid via AttributeUtilities.CombineClassNames. Fixes dotnet#43860
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This was referenced Apr 25, 2026
[test-quarantine] Unquarantine CacheTagHelperTest.ProcessAsync_AwaitersUseTheResultOfExecutor
#66474
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Friendly ping - this small Blazor change (#43860) has been open since April 19 without a reviewer assigned. cc @MackinnonBuck @javiercn - could one of you tag an area owner? Happy to address any feedback. |
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@KitKeen, thank you for your contribution. According to the previous discussion from #43928 (comment), the behavior of overwrite is by design and expected. It is being discussed also under this PR: #66531. Let us know under the issue if you see a case when the override is not done correctly. |
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Combine ValidationSummary class attribute with custom classes
Fixes #43860
Problem
Passing a
classattribute to<ValidationSummary />via attribute splatting silently overrode the built-invalidation-errorsclass:<ValidationSummary class="pt-2" data-test="x" />Before:
<ul class="pt-2" data-test="x">(validation-errors lost)After:
<ul class="pt-2 validation-errors" data-test="x">Fix
Use the existing
AttributeUtilities.CombineClassNames(...)helper thatInputBase,InputRadio, andQuickGridalready use. SplatAdditionalAttributesfirst, thenadd the merged
classattribute soProcessDuplicateAttributeskeeps the merged value.Tests
Added
ValidationSummaryTest.cscovering:<ul>when no messages