Question

This jQuery code response with “undefined” why ??

    function YouTube2()
    {
        $(document).ready(function(){
            var txt="";
            var url='https://gdata.youtube.com/feeds/api/videos?q=GoogleDevelopers&max-results=10&v=2&alt=jsonc';
            $.getJSON(url,function(json) {
                alert("ss");
                $.each(json.data.items, function(index, elem) {
                    alert(json.data.items[index].thumbnail.default);
                });
             });
        });
     }
     YouTube2();

Answer 1

change default to sqDefault or hqDefault

http://sandbox.phpcode.eu/g/6aea7

        alert(json.data.items[index].thumbnail.Default);

to

        alert(json.data.items[index].thumbnail.sqDefault);

or to

        alert(json.data.items[index].thumbnail.hqDefault);