jquery selection if option.value equal something, mark a selected

Question

I have some question about jquery selection. In my case, how to match if the option.value equal something, mark a selected for it. Online code here

Answer 1

try below

    $("div#selection select.select").val(num);

if your select box is multiple select, you can try

    $("div#selection select.select option").each(function(){
      if($(this).val()==num){ 
        $(this).attr("selected", true);    
      }
   });