Pops wrote:
> I think I have a "theory" about why this is happen and it might not be
> jQuery related but just Javascript, but maybe someone can explain this
> because it is so odd.
>
> This is the code:
>
> logln("wcError "+IsHidden('wcError')?"hidden":"not hidden");
>
> logln() is a function tha basically appends text to a log window.
> However, I don't see
>
> "wcError hidden" or "wcError not hidden"
>
> but rather:
>
> " hidden" or "not hidden"
>
> in other words, the left side string "wcError " is not concentated.
>
> But the following works:
>
> s = IsHidden('wcError')?"hidden":"not hidden"
> logln("wcError "+s);
>
> or this by enclosing it with ()
>
> logln("wcError "+(IsHidden('wcError')?"":"not ")+"hidden");
>
> but not this (without parenthesis)
>
> logln("wcError "+IsHidden('wcError')?"":"not "+"hidden");
>
> IsHidden() just returns true or false
>
> function IsHidden(s) {
> var e = document.getElementById(s);
> return !e?true:e.style.display != "block";
> }
>
> Anyway, logln() was first a jQuery method for my plugin and in trying
> to see what is going I am made it strictly DOM so I see it isn't
> jQuery related.
>
> What am I missing here? Something about how JS sees strings that I am
> missing here.
That is a matter of operator precedence. The plus operator has higher
precedence than the conditional operator, thus
"wcError "+IsHidden('wcError')
gets evaluated first, afterwards the ?:
http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Operators:Operator_Precedence
--Klaus
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