HTMLSelectElement.selectedIndex

The HTMLSelectElement.selectedIndex is a long that reflects the index of the first or last selected <option> element, depending on the value of multiple. The value -1 indicates that no element is selected.

Syntax

var index = selectElem.selectedIndex;
selectElem.selectedIndex = index;

Example

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

var selectElem = document.getElementById('select')
var pElem = document.getElementById('p')

// When a new <option> is selected
selectElem.addEventListener('change', function() {
  var index = selectElem.selectedIndex;
  // Add that data to the <p>
  pElem.innerHTML = 'selectedIndex: ' + index;
})

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'HTMLSelectElement' in that specification.
Living Standard No change since the latest snapshot, HTML5.
HTML5
The definition of 'HTMLSelectElement' in that specification.
Recommendation Initial definition, snapshot of HTML Living Standard.

Browser compatibility

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