arraySort2.js

    $('#btnSubmit').on('click', 
        function(){ 
            var finalWords = [];
            var txt = $("#txtInput").val().replace(/ /g,'');
            var words = txt.split(",");
            var newWords = words.sort();
            for(x in newWords){                
                var str = newWords[x];
                if (x>0){
                    str = " " + str
                }
                finalWords.push(str);
            }
            $("#txtInput").val(finalWords);
        }
    );