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<select id="divider" onchange="showOptions(this)";>
    <option value="option 1" selected>option 1</option>
    <option value="option 2">option 2</option>
    <option value="option 3">option 3</option>
</select>

function showOptions(s) {
    console.log(s[s.selectedIndex].value); // get value
    console.log(s[s.selectedIndex].id); // get id
}