HTMLSelectElement: selectedIndex 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 selectedIndex property of the <select> element, if any, or −1 if no <option> is selected. Setting this property selects the option at that index and deselects all other options, while setting it to -1 deselects any currently selected options.
Value
A number.
Examples
HTML
html
<p id="p">selectedIndex: 0</p>
<select id="select">
<option selected>Option A</option>
<option>Option B</option>
<option>Option C</option>
<option>Option D</option>
<option>Option E</option>
</select>
JavaScript
js
const selectElem = document.getElementById("select");
const pElem = document.getElementById("p");
/ When a new <option> is selected
selectElem.addEventListener("change", () => {
const index = selectElem.selectedIndex;
/ Add that data to the <p>
pElem.textContent = `selectedIndex: ${index}`;
});
Specifications
| Specification |
|---|
| HTML # dom-select-selectedindex-dev |