gistfile1.js

var serializeElements = (function(){
  
  function isSuccessful(element) {
    // http://www.w3.org/TR/html401/interact/forms.html#h-17.13.2
    return (
      !element.disabled && // should not be disabled
      element.name && // should have a name
      !'^file|reset$'.test(element.type) && // should not be of `file` or `reset` types
      Element.getValue(element) != null // should have a non-null value
    );
  }
  
  return function(elements, options) {
    if (typeof options != 'object') {
      options = { hash: !!options };
    }  
    else if (Object.isUndefined(options.hash)) {
      options.hash = true;
    }
    
    var submitted = false, 
        submit = options.submit;
    
    var data = elements.inject([], function(data, element) {
      if (isSuccessful(element) && (element.type != 'submit' || (!submitted && 
        // TODO: this is confusing
        submit !== false && (!submit || element.name == submit) && (submitted = true)))) {
        var temp = {};
        o[element.name] = Element.getValue(element);
        data.push(o);
      }
      return data;
    });
    
    return options.hash ? data : Object.toQueryString(data);
  }
})();