title: Count the number of selected items in multiselect listbox using javascript
body: <p>I need to get the count of selected items in multi select listbox, tried below but couldnt make it work.</p>
  
  <pre><code> var selItem = document.getElementById("users").options; 
          if(selItem.selected == 0){
          alert('select item');
          }
  </code></pre>
  
  <p>here i tried to give alert if there is no item selected, but not working</p>
  
  <pre><code>if (document.getElementById('usersb').options:selected.length == 0){
   alert('select item');
   }
  </code></pre>
  
  <p>Can anyone give an idea, how can i do that.</p>