jquery change option value code example
Example 1: jQuery change select value
$("#mySelectElementID").val("my_new_value"); //change selected option/value with jQuery
Example 2: jquery set select value
$("div.id_100 select").val("val2");
$("#mySelectElementID").val("my_new_value"); //change selected option/value with jQuery
$("div.id_100 select").val("val2");