HTMLOptionsCollection: length property

The length property of the HTMLOptionsCollection interface returns the number of <option> elements in the collection. The property can get or set the size of the collection.

When setting length to a value smaller than the current, the options collection gets truncated; otherwise, new blank <option> elements are appended to the end of the <select>.

Value

An integer value representing the number of items in this HTMLOptionsCollection.

Example

js
const optCollection = document.getElementById("fruits").options;
const origLength = optCollection.length;
optCollection.length += 50; // adds 50 blank options to the collection
optCollection.length = origLength; // truncates the list back to the original size

Specifications

Specification
HTML
# dom-htmloptionscollection-length-dev

Browser compatibility

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desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
length

Legend

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Full support
Full support

See also