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

Your code works well. Just update 'this' with $(this). If there are no any other select dropdowns you can omit 'div#selection select.' like below.

$(document).ready(function(){
    var num = 3;
    $("select option").each(function(){     
        if($(this).val()==num){
            $(this).attr("selected","selected");    
        }
    });
});