[whatwg] question about the input tag attributes
Jukka K. Korpela
jkorpela at cs.tut.fi
Wed Apr 13 00:56:18 PDT 2011
Nicola Di Fabrizio wrote:
> is it possible to set a attribute for checking the element
> if it is not empty
Yes, there's the attribute required, see
> <input type="text" needed="yes">
Like <input type="text" required>.
No value is needed, it's a "boolean" attribute (somewhat misleading, but
this name is justified by the logic that the _presence_ or absence of the
attribute in markup implies a boolean value - true or false - for the IDL
attribute, a property of the object).
> if needed = yes and the element has no value
> then appears a msgbox like
> "Please input something..."
Something like that, though this has been implemented in a few browsers
only, e.g. Opera.
> or the msgbox text is also an attribute
> where you can put in your own message.
Well not in markup, but HTML5 specifies the setCustomValidity() method for
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