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how to iterate on a NodeSet ?
Posted by nir_tayeb on May 30 2006 @ 22:09 :: 3907 unique visits
This is one of the most efficient ways to iterate on each of the elements in the NodeSet object:CODE: JAVASCRIPT
var element = document.getElementById("container-id"), // get reference to the element
divs = element.getElementsByTagName("div"); // get all div elements in NodeSet object
for(var i=0, len=divs.length, div;i<len;i++){
div = divs[i];
// deal with the div
//...
}
divs = element.getElementsByTagName("div"); // get all div elements in NodeSet object
for(var i=0, len=divs.length, div;i<len;i++){
div = divs[i];
// deal with the div
//...
}
An hebrew description of this method.
A benchmark check of this method vs the traditional method:
CODE: JAVASCRIPT
var element = document.getElementById("container-id"), // get reference to the element
divs = elements.getElementsByTagName("div"); // get all div elements in NodeSet object
for(var i=0;i<divs.length;i++){
// deal with the div using divs[i]
//...
}
divs = elements.getElementsByTagName("div"); // get all div elements in NodeSet object
for(var i=0;i<divs.length;i++){
// deal with the div using divs[i]
//...
}
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2. On May 31 2006 @ 07:06 nir_tayeb wrote:
There is another difference, in the first code I save the reference into a local variable (this is the big difference). I don't want to call every time to the NodeSet to get the reference. Instead I save the reference in a local variable of the loop and use it.3. On Apr 14 2009 @ 13:30 guest wrote:
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1. On May 30 2006 @ 23:46 Revvy wrote:
So the only difference is that you use a variable for length instead of querying the value every iteration? This means that you can't do anything to the container object that can affect the length, otherwise you won't end up iterating over the entire nodeSet.