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If I use object.getElementsByTagName(tagName) in a for statement

marcel ethan 2178 12-Aug-2013

If I use object.getElementsByTagName(tagName) in a for statement,

for (index = 0; index < object.getElementsByTagName(tagName).length; index++) {

object.getElementsByTagName(tagName)[index].property = value;

}

Does the browser instantiate a new nodeList object for every pass through the loop, or does thebrowser simply refer to a single generated list every time, or maybe it instantiates a list, references the object specified and unloads the list object every pass through the loop?

I've been wondering if its better to store the nodeList object to a variable and reference it when neened.

javascript javascript 
Updated on 12-Aug-2013
marcel ethan

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1 Answers

Pravesh Singh

Pravesh Singh

12-Aug-2013

Your browser is generating a new list each time. But this code will work as index is changing every run.

It is a good practice to first save node list in some var:

var index = 0;
while(index<object.getElementsByTagName(tagName))
{
  elements[index].property = value;
  index++;
}
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