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Description Given the following TagHelper:
[ HtmlTargetElement ( "input" , Attributes = "asp-for,[type=checkbox]" ) ]
public class FooTagHelper : TagHelper
{
public override int Order => - 2000 ;
public override void Process ( TagHelperContext context , TagHelperOutput output )
{
var tb = new TagBuilder ( "input" ) ;
tb . AddCssClass ( "myclass" ) ;
output . MergeAttributes ( tb ) ;
}
} And the following source:
< input asp-for ="BoolVal " class ="my-control " type ="checkbox " /> You end up getting an invalid class attribute value:
< input checked ="checked " class ="Microsoft.AspNetCore.Mvc.TagHelpers.TagHelperOutputExtensions+ClassAttributeHtmlContent " data-val ="true " data-val-required ="The BoolVal field is required. " id ="BoolVal " name ="BoolVal " type ="checkbox " value ="true " /> < input name ="BoolVal " type ="hidden " value ="false " /> This is because of how we copy the pre-existing output attributes .
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Given the following
TagHelper:And the following source:
You end up getting an invalid class attribute value:
This is because of how we copy the pre-existing output attributes.