What is this Solved with thanks

[niche]

I can't find a ref for the double question marks.

document.getElementById('cursorY').value = (window.Event) ? e.pageY : event.clientY + (document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop);}

Do you have one?

Edited August 16, 2012 by niche

[justsomeguy]

That's 2 ternary operators, not a "double question mark". There's no "??" operator, that is a pair of "?:" operators.

[niche]

I know the simple ternary reads if-then-else. How does the one in the op read?

[ShadowMage]

Ternary operators can be nested just like if/else statements. When expanded, the ternary in the OP might look something like this:

var val; // Start of the ternary syntax conversionif (window.Event) { //Condition from first ternary	//"True" portion of first ternary	val = e.pageY;} else {	//"False" or "else" portion of first ternary	val = event.clientY;	if (document.documentElement.scrollTop) { //Condition from second ternary		//"True" portion of second ternary		val += document.documentElement.scrollTop;	} else {		//"False" or "else" portion of second ternary		val += document.body.scrollTop;	}}//End of the ternary syntax conversion document.getElementById('cursorY').value = val;

Edited August 16, 2012 by ShadowMage

[niche]

Outstanding topic ShadowMage & justsomeguy. Thanks for all the extra attention to detail ShadowMage. It's appreciated very much. Niche

Edited August 16, 2012 by niche