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length


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.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

core


mozilla.org | mailto:oeschger | bug 93108
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