Select.selectedIndex : Select : Form JAVASCRIPT TUTORIALS

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Select.selectedIndex

The selectedIndex property returns the index number of the selected option in that instance of a select box.

If this property is used to access a multiple select box, it will return the index number of the first selected item.



<html>
    <form name="myForm">
      <select name="mySelect" onChange='alert(mySelect.selectedIndex)'>
        <option value=A>AA</option>
        <option value=B>BB</option>
        <option value=C>CC</option>
        <option value=D>DD</option>
      </select>
    </form>
</html>