how to set selected value of dropdown in jquery using new option code example

Example 1: set select option as selected jquery

$(document).ready(function() {
    $("#gate option[value='Gateway 2']").prop('selected', true);
    // you need to specify id of combo to set right combo, if more than one combo
});

Example 2: set dropdown in jquery

$('select[name^="salesrep"] option[value="Bruce Jones"]').attr("selected","selected");