code: function( element, obj ) {
      var accessor = this._getAccessor( obj );
      var value = accessor.get( element.name || '');
      value = this._format( element.name, value, element );
      if( element.type == "radio" || element.type == "checkbox" )  {
        element.checked = this._isSelected( element.value, value );
      } else if ( element.type == "select-one" || element.type == "select-multiple" ) {
        for( var j = 0; j < element.options.length; j++ ) {
          element.options[j].selected = this._isSelected( element.options[j].value, value );
        }
      } else {
        element.value = value || "";
        // reset defaultValue if we only want to serialize changed fields
        if (this.changedOnly) {
          element.defaultValue = value;
        }
      }
    }
docs: update the form field with the property value