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HTMLCollection: length property

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

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
length 1 12 1 8 ≤12.1 1 4.4 18 4 ≤12.1 1 1.0

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https://developer.mozilla.org/en-US/docs/Web/API/HTMLCollection/length