Thursday, February 22, 2024

ASP.NET MVC and Bootstrap error classes

Bootstrap requires specific error classes to be applied to inputs (e.g. is-invalid). MVC on the other hand has its own error classes (e.g. field-validation-error). There are numerous ideas how to combine the two and this is another one.
The idea is to dirty replace MVC error classes using reflection. A starting point would be to change the input's error class:
typeof( HtmlHelper ).InvokeMember(
	nameof( HtmlHelper.ValidationInputCssClassName ),
	System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.SetField,
	typeof( HtmlHelper ),
	new[] { "is-invalid" } ); 
This one overwrites the const HtmlHelper.ValidationInputCssClassName from its default value (field-validation-error) to Bootstrap's is-invalid. Calling this early causes invalid inputs have Bootstrap class.

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