jQuery obtenga el valor de la opción seleccionada
$("select.your-select").change(function(){
$(this).children("option:selected").val();
});
noqta.tn
$("select.your-select").change(function(){
$(this).children("option:selected").val();
});$( "#myselect option:selected" ).text();$("#id option:selected").text();$('.id_100 option[value=val2]').attr('selected','selected');
$( "#myselect option:selected" ).val();<select id="state">
<option value="state1" data-id="1">state1</option>
<option value="state2" data-id="2">state2</option>
<option value="state3" data-id="3">state3</option>
</select>
$('#state option[data-id="2"]').val();
//output state2