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<html><body><p>Do not select a fruit, just click the button. The selectedIndex property will return "-1" if no options are selected.</p><select id="mySelect" size="4"> <option>Apple</option> <option>Orange</option> <option>Pineapple</option> <option>Banana</option></select><button type="button" onclick="myFunction()">Display index</button><script>function myFunction() { var x = document.getElementById("mySelect").selectedIndex; alert(x);}</script></body></html>