javascript - Enter to Tab script does not pass over a checkbox? -

i trying convert enter tab, , works perfect form fields, not checkbox on page. have ideas why not?

enter tab code :

<script type="text/javascript"> function tabe(obj, e) {   var e = (typeof event != 'undefined') ? window.event : e; // ie : moz    var self = $(obj),     form = self.parents('form:eq(0)'),     focusable, next;    if (e.keycode == 13) {     focusable = form.find('input,a,select,button,textarea').filter(':visible');     next = focusable.eq(focusable.index(obj) + 1);     if (!next.length) {       next = focusable.first();     }     next.focus();     return false;   } } </script> 

the evil checkbox :

<input class="case" type="checkbox" onkeyup="return tabe(this,event);"/> 

edit: (html code) :

<td> <input class="case" type="checkbox" onkeypress="return tabe(this,event);"/> </td> 

jquery :

 html += '<td><input class="case" id="caseno_'+i+'" type="checkbox"/></td>'; 

it works me. updated show continues work if checkboxes created dynamically.

function tabe(obj, e) {    var e = (typeof event != 'undefined') ? window.event : e; // ie : moz      var self = $(obj),        form = self.parents('form:eq(0)'),        focusable, next;      if (e.keycode == 13) {      focusable = form.find('input,a,select,button,textarea').filter(':visible');      next = focusable.eq(focusable.index(obj) + 1);      if (!next.length) {        next = focusable.first();      }      next.focus();      return false;    }  }  var lid = 0;  $(function () {    $('#addnewcheck').on('click', function(e) {      lid +=1;      $('<input id="' + lid + '" class="case" type="checkbox" onkeypress="return tabe(this,event);"/>').insertafter(':checkbox:last');    });  });

<script src="http://code.jquery.com/jquery-1.11.3.js"></script>      <form action="action_page.php">      first name:<br>      <input type="text" name="firstname" value="mickey" onkeypress="return tabe(this,event);"><br>      last name:<br>      <input type="text" name="lastname" value="mouse" onkeypress="return tabe(this,event);"><br><br>      case:<br>      <input class="case" type="checkbox" onkeypress="return tabe(this,event);"/>      <br>      <input type="submit" value="submit" onkeypress="return tabe(this,event);">  </form>  <br>  <button id="addnewcheck">add new  checkbox </button>