HTMLCollection: length property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The HTMLCollection.length property returns the number of items in a HTMLCollection.
Value
An integer value representing the number of items in a HTMLCollection.
Examples
The length property is often useful in DOM programming. It's often used to test the length of a list, to see if it exists at all. It's also commonly used as the iterator in a for loop, as in this example.
js
// All the elements with the class ".test" in the document const items = document.getElementsByClassName("test"); // For each test item in the list, // append the entire element as a string of HTML let gross = ""; for (let i = 0; i < items.length; i++) { gross += items[i].innerHTML; } // gross is now all the HTML for the test elements Specifications
| Specification |
|---|
| DOM # ref-for-dom-htmlcollection-length① |