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

The first time where you refer to this it is not a jQuery object it is a DOM object and a DOM object doesn't have the val() method. You should either use this.value och $(this).val() try this:

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