Q:

Add rows to table dynamically in HTML

How to add new rows to HTML table automatically by getting the data of these rows from a web page.
<table class="sortable">
    <thead>
        <tr>
            <th>Foldername</th>
            <th>Subfolder</th>
        </tr>
    </thead>
    <tbody>
        <tr class='$class'>
           <td><span id="albumname"></span></td>
           <td><span id="subdirname"></span></td>              
        </tr>
    </tbody>
</table>

Foldername and Subfolder are the headings and no need to change them, but albumname and subdirname must changed by their corresponding values each row.
I get the data using websocket:
 $.get("http://localhost:8040/api/album", function (data) {
            console.log("data: ", data);
            var i;
            var j;
            console.log(i);
            for (i = 0; i < data.length; i++) {
                console.log("start for loop");
                var albname = data[i].Name;
                console.log("albname: ", albname);
                $("#albumname").text(albname);
                var subalbum = data[i].SubAlbums
                for (j = 0; j < subalbum.length; j++) {
                    var subname = data[i].SubAlbums[j];
                    console.log("SubName: ", subname);
                    $("#subdirname").text(subname);
                }
            }
        });

A:

Add a class to <body> like this,
<tbody class="tableBody">

</tbody>

And update your jQuery code as follow, assuming there would be multiple subdirename for each album.
$.get("http://localhost:8040/api/album", function (data) {
      var i;
      var j;
      $('.tableBody').html('');
      for (i = 0; i < data.length; i++) {
        console.log("start for loop");
        var albname = data[i].Name;

        var bodyTr=$('<tr>');

        var albumNameTd=$('<td>');
        albumNameTd.text(albname);

        var subDirNameTd=$('<td>');
        var subDirHtml="";

        var subalbum = data[i].SubAlbums;

        for (j = 0; j < subalbum.length; j++) {
          var subname = data[i].SubAlbums[j];
          subDirHtml+=subname;
          if(j!=subalbum.length-1) {
                subDirHtml+="<br>";
          }
        }
        subDirNameTd.html(subDirHtml);
        bodyTr.append(albumNameTd);
        bodyTr.append(subDirNameTd);
        $('.tableBody').append(bodyTr);
      }
});

