Checking if element is in the node of another element

[abs]

Has anybody seen a function which checked if one of passed elements is
nested in the node of another element passed to function, no matter how deep
it is nested ?

Thanks in advance,
ABS

[RobG]

abs wrote:

Has anybody seen a function which checked if one of passed elements is
nested in the node of another element passed to function, no matter how deep
it is nested ?

No. The following expects to be passed a reference to two elements.
If y is a descendent of x, it returns true. Otherwise, false.

function isDescendent(x, y){
while ( y = y.parentNode ) {
if ( y == x ) return true;
}
return false;
}


--
Rob

[Lasse Reichstein Nielsen]

RobG <rg***@iinet.net.auau> writes:

function isDescendent(x, y){
while ( y = y.parentNode ) {

Just for safety, I recommend writing this as:
while ( (y = y.parentNode) ) {
just to make it explicit that you really mean an assignment and
not a comparison. Otherwise, it's just a matter of time before
some misguided coder puts this code into a
<script language="JavaScript1.2">...</script>
element and has it break in Mozilla ... because JavaScript version 1.2
actually "fixed" code like this to be a comparison.

/L
--
Lasse Reichstein Nielsen - lr*@hotpop.com
DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleDOM.html>
'Faith without judgement merely degrades the spirit divine.'

[Thomas 'PointedEars' Lahn]

abs wrote:

Has anybody seen a function which checked if one of passed elements is
nested in the node of another element passed to function, no matter how
deep it is nested ?

Yes.
PointedEars