[whatwg] HTMLInputElement::valueAsNumber and NaN Infinity

[TAMURA, Kent]

On setting, if the  
valueAsNumber<http://www.whatwg.org/specs/web-apps/current-work/multipage/common-input-element-attributes.html#dom-input-valueasnumber>  
attribute
> does not apply, as defined for the  
> input<http://www.whatwg.org/specs/web-apps/current-work/multipage/the-input-element.html#the-input-element>
>   element's  
> type<http://www.whatwg.org/specs/web-apps/current-work/multipage/the-input-element.html#attr-input-type>  
> attribute's
> current state, then throw  
> anINVALID_STATE_ERR<http://www.whatwg.org/specs/web-apps/current-work/multipage/urls.html#invalid_state_err>  
> exception.
> Otherwise, if the  
> valueAsDate<http://www.whatwg.org/specs/web-apps/current-work/multipage/common-input-element-attributes.html#dom-input-valueasdate>  
> attribute
> applies, run the algorithm to convert a Date object to a  
> string<http://www.whatwg.org/specs/web-apps/current-work/multipage/the-input-element.html#concept-input-value-date-string>  
> defined
> for that state, passing it a Date object whose time value is the new
> value, and set the  
> value<http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#concept-fe-value>  
> of
> the element to resulting string. Otherwise, run the algorithm to convert a
> number to a  
> string<http://www.whatwg.org/specs/web-apps/current-work/multipage/the-input-element.html#concept-input-value-number-string>,
> as defined for that state, on the new value, and set the  
> value<http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#concept-fe-value>  
> of
> the element to resulting string.


It seems the current spec doesn't define behavior in a case of setting NaN
or Infinitiy to HTMLInputElement::valueAsNumber.
Because 'input.valueAsDate = null' makes the value empty, I think
'input.valueAsNumber = Number.NaN' also makes the value empty.

-- 
TAMURA Kent
Software Engineer, Google



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