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<html><body><select id="mySelect"> <option>Apple</option> <option>Orange</option> <option>Pineapple</option> <option>Banana</option></select><p>Click the button to select the option element with index "2".</p><p><b>Note:</b> The index starts at 0.</p><button onclick="myFunction()">Try it</button><script>function myFunction() { document.getElementById("mySelect").selectedIndex = "2";}</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_select_selectedindex by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 05 Sep 2022 15:53:13 GMT --></html>