Question

Probably a simple solution, but i don’t get it working. I have a table with unique id attributes. Via buttons i can change the order of the table rows. When i click a button i want to receive the current order. This works fine with the code below except for the first value, which is undefined. How can i get rid of that undefined value?

    $("#saveOrder").click(function(e){
        var event = e || window.event;
        event.preventDefault();
        var t = "";
        $("#eventTable tr").each(function(){
            t += $(this).attr("id");
        });
        alert(t);
    });

I tried t += $(this).attr("id").replace("undefined",""); but then the script won't alert() anything

Answer 1

Try t += this.id || ""; This will substitute an empty string for undefined values.

Note that you can’t use replace on undefined, since undefined isn’t a string. You can convert a value x to a string representation via String(x) or x+''. However, this isn’t necessary in this case.

EDIT

As Esailija points out, no need to create a jQuery object here.