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+--- Thread: Adding contains method to mozilla (/showthread.php?tid=778)
Adding contains method to mozilla - z12 - Apr. 10, 2006 12:01 AM
Here's the code I'm trying out:
Code:
// create a contains method for gecko to check if one node is contained in another
// based on http://www.quirksmode.org/blog/archives/2006/01/contains_for_mo.html
// ie & opera have a contains method
function prxContainsCheck(){
var n=document.documentElement;
if(typeof(n.contains)=='undefined' && typeof(n.compareDocumentPosition!='undefined')){
try{
Node.prototype.contains=function(arg){return !!(this.compareDocumentPosition(arg) & 16)};
}catch (e){
alert("create contains method failed");
}
}
// alert(typeof(n.contains));
// alert(typeof(n.contains(n.firstChild)));
// alert(n.contains(n.firstChild));
}
prxContainsCheck();It seems that this would be more efficient than looping or bubbling up through the document, ala BrainJar.
Mike
- z12 - Apr. 21, 2006 09:45 AM
Heres the latest version I'm using:
Code:
//-----------------------------------
// create a contains method for mozilla to check if one node is contained in another
// based on http://www.quirksmode.org/blog/archives/2006/01/contains_for_mo.html
// ie & opera have a contains method
// added isSameNode check to make it work like ie & opera
function prxContainsCheck(){
var n=document.documentElement;
if(typeof(n.contains)=='undefined' && typeof(n.compareDocumentPosition!='undefined')){
try{
Node.prototype.contains=function(arg){return !!(this.compareDocumentPosition(arg) & 16 || this.isSameNode(arg))};
}catch (e){
alert("create contains method failed");
}
}
}
prxContainsCheck();
//-----------------------------------IE & Opera return true when a node is compared to itself, so I added the isSameNode check.
This function has turned out to be quite handy.
Mike