how to change select value using jquery code example

Example 1: change value of drop down using jquery

$('#ddlID').val('New_OptionValue').change()

Example 2: jQuery change select value

$("#mySelectElementID").val("my_new_value"); //change selected option/value with jQuery

Example 3: click select option to update div jquery

$('#choose').change(function(event) {
        $.post('info.php', { selected: $('#choose').val() },
            function(data) {
                $('#update').html(data);
            }
        );            
    });