This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The read-only index property of the HTMLOptionElement interface specifies the 0-based index of the element; that is, the position of the <option> within the list of options it belongs to, in tree-order, as an integer. If the <option> is not part of an option-list, the value is 0.
A number.
const optionElement = document.getElementById("myOption");
console.log(optionElement.index);
| Specification |
|---|
| HTML> # dom-option-index-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 | |
index |
1 | 12 | 1 | ≤12.1 | 3 | 18 | 4 | ≤12.1 | 1 | 1.0 | 4.4 | 1 |
<option><select><datalist>HTMLOptionElement.defaultSelectedHTMLOptionElement.selectedHTMLSelectElement.selectedIndexHTMLOptionsCollection
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLOptionElement/index