Answers for "set selected value for select jquery"

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
});

jquery select change get selected value

$('select').on('change', function() {
  alert( this.value );
});

jquery set select value

$("div.id_100 select").val("val2");