We have a Forms drop-down populated by a database query.  When a user selects a value from the drop-down, numerous other forms fields are populated by the lookup match.  One user suggested that we default the value of the drop-down to the most commonly selected value.  I wasn't sure we could do this with a database query populating the drop-down, but figured out a way using jQuery:

  function setSelectDefault(cssSelector, defaultValue) {
    var select = $(cssSelector + ' select');
    select.append($('<option>', { value: defaultValue }).text(defaultValue));
    select.val(defaultValue);
    select.change();
  }
  ...
  ...
  ...
  setSelectDefault('.dropDownClass', 'Foobar'); 

The above code looks for the drop-down identified by the class .dropDownClass, adds an option named Foobar and selects it, and then fires the drop-down change event to do the lookup match.  Seems to work great!  Once the json fires that populates the drop-down with database query results, the appropriate value remains selected.

Any issues with this?