show all:clear content before populating div added

templates/layout.html

@@ -139,6 +139,7 @@ var flag = true;
 
       $("#showall").click(function(event){
         if (flag === true) {
+          $(".name-elements").empty();
           $('.file-names-container span').each(function () {
             var current = $(this).attr('id');
             $.getJSON('{{ url_for('static', filename='js/mergedjson.json') }}', function(test) {