Javascript function for retrieving values from HTML select/option input.

getSelectOptions.js

/*
* Accept select box id (as string) and return the selected options as an array.
* @param {String} selectID HTML id for the select box.
*/
function getSelectedOptions(selectID)
{
  var result = [];
  var options = document.getElementById(selectID).options;
  
  for (var i = 0; i < options.length; i++)
  {
    if (options[i].selected)
    {
      result.push(options[i].value);
    }
  }
  return result;
}