Selecione o ouvinte do evento de tag
// directly pass selected value to function in onchange!
function myFunction(chosen) {
console.log(chosen);
}
<select onChange="myFunction(this.options[this.selectedIndex].value)">
<option value="1">Text 1</option>
<option value="2">Text 2</option>
</select>
Literate Lentil