Retrieve items count from dropdown list using javascript

var cntSel = document.getElementById(‘<%=ddl.ClientID%>’);
if (cntSel.length > 1)

{
if (document.getElementById(‘<%=ddl.ClientID%>’).value == ’0′)

{
alert(‘Select Dropdown..’);
document.getElementById(‘<%=ddl.ClientID%>’).focus();
return false;
}
}

cntSel.length – by this you can find the dropdown contains items or not.