Select drop-down list in jquery

  Get selected value using class :-

$(".drop_down_class").val();

Get selected value using Id :-

$("#drop_down_id").val();

Get text of selected value :-

$("#drop_down_id").text();

Get value of nth option :-

$("#drop_down_id option:nth-child(1)")

Get index of selected option :-

$("#drop_down_id option:selected").index()

Set value using class :-

$('.drop_down_class').val('value');

Set value using Id :-

$('#drop_down_id').val('value');

Set value using text :-

var text = 'some_text';
$("#drop_down_id option").filter(function() { 
   return this.text == text }).attr('selected', true);

Set value using index :-

$("#drop_down_id").attr("selectedIndex", 3);

Add options in select drop down :-

$("#drop_down_id").append( $('').val("5").html("BUG")

Clear all options of select drop down list :-

$("#drop_down_id").empty();

Make drop down list disabled :-

$("#drop_down_id").attr("disabled", true);