Client validation with RangeAttribute

[McVanS]

Recently I revisited an old MVC concept and started updating some of the components to .Net 9. I started updating my JavaScript client validation code and ran into a problem with the RangeAttribute.

The new RangeAttribute now supports MinimumIsExclusive and MaximumIsExclusive parameters.

[Range(1,10)] renders HTML attributes
data-val="true" data-val-range="The field Test must be between 1 and 10." data-val-range-max="10" data-val-range-min="1"

[Range(1,10,MinimumIsExclusive = true, MaximumIsExclusive = false)] renders HTML attributes
data-val="true" data-val-range="The field Test must be between 1 exclusive and 10." data-val-range-max="10" data-val-range-min="1"

[Range(1,10,MinimumIsExclusive = false, MaximumIsExclusive = true)] renders HTML attributes
data-val="true" data-val-range="The field Test must be between 1 and 10 exclusive." data-val-range-max="10" data-val-range-min="1"

[Range(1,10,MinimumIsExclusive = false, MaximumIsExclusive = true)] renders HTML attributes
data-val="true" data-val-range="The field Test must be between 1 exclusive and 10 exclusive." data-val-range-max="10" data-val-range-min="1"

Note the default error messages correctly reflects the intension. The actual server sider validation works as expected.

Historically for client validation one would retrieve a data attribute from an input element to do client validation with. A data attribute indicating the exclusive state of the minimum and/or maximum value(s) is absent in the generated HTML element. Except for the error message there is no other way one can determine the exclusive state of the value