This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The length property of the HTMLSelectElement interface specifies the number of <option> elements in the <select> element. It represents the number of nodes in the options collection. On setting, it acts as (HTMLOptionsCollection.length).
A number.
const selectElement = document.getElementById("fruits");
console.log(selectElement.length);
| Specification |
|---|
| HTML> # dom-select-length-dev> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
length |
1 | 12 | 1 | ≤12.1 | 3 | 18 | 4 | ≤12.1 | 1 | 1.0 | 4.4 | 1 |
<select><option>HTMLSelectElement.optionsHTMLSelectElement.selectedOptionsHTMLSelectElement.multipleHTMLSelectElement.selectedIndex
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement/length