Is there an onSelect event or equivalent for HTML ?

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Here is the simplest way:

<select name="ab" onchange="if (this.selectedIndex) doSomething();">
    <option value="-1">--</option>
    <option value="1">option 1</option> 
    <option value="2">option 2</option>
    <option value="3">option 3</option>
</select>

Works both with mouse selection and keyboard Up/Down keys whes select is focused.

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