How to set the selected value for a drop down list based on another drop down list?

Question

If I select x value in the first drop down list, then Y value would be selected on the second drop down list.

Answer 1

If you wan it in jQuery then;

$("#yourFirstSelectId").change(function() {
   var firstSelected = $(this).val();
   $("#yourSecondSelectId option:selected").val(firstSelected);
});