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length

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length returns the number of items in a list.

Syntax

no_of_items = nodeList.length
 

Parameters

no_of_items is an integer value representing the number of items in a list.

Example

// all the paragraphs in the document items = document.getElementsByTagName("p"); // are there any at all? if ( items.length ) {     // for each item in the list,     // append the entire element as a string of HTML     for (var i = 0; i < items.length; i++) {         gross += items[0].innerHTML;         // gross is now all the HTML for the paragraphs     } }

Notes

length is a very common property in DOM programming. It's very common to test the length of a list (to see if it exists at all) and to use it as the iterator in a for loop, as in the example above.

Specification

length