CODEWITHSUNDEEP
jqueryasp.netvalidationasp.net-coreasp.net-core-mvc
Simon
Simon

Reputation: 181

ASP.NET Core validation tag helper strange behaviour

Today I noticed strange behaviour of ASP.NET Core taghelper when testing validation messages.

I have no jquery-validate and jquery-validate-unobtrusive in place.

This works fine:

<span asp-validation-for="Name" class="text-danger"></span>

This is not working:

<span asp-validation-for="Name" class="text-danger" />

Any idea why?! Is this a bug?

Thanks for your inputs!

Upvotes: 0

Views: 360

Answers (1)

Will Ray
Will Ray

Reputation: 10889

@Jonathan is correct - this an invalid element to be self-closing. Making a tag self-closing indicates that it is a void element - meaning the tag has no content inside of it. Span tags totally have content!

However, the reason it doesn't work in Core is because what happens on this line. With a self-closing tag, the TagMode property on the output variable is set to SelfClosing, and the TagBuilder isn't going to put any of the message content in to it (because it is a void element which has no content).

With a </span> at the end, the mode changes to StartTagAndEndTag and content is properly added.

Upvotes: 1

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