how to change selected value of dropdown in jquery code example

Example 1: change value of drop down using jquery

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

Example 2: set dropdown in jquery

$('select[name^="salesrep"] option:selected').attr("selected",null);

Example 3: jQuery change select value

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