Gravity Forms TripFilter

    tripFilter = function () {
          var tripClass = '.hotel-trip select',
            hotelClass  = '.hotel-name select',
            cityClass = '.city-date select',
            unusedClass = '.unused-options select';

          var tripSelect = jQuery(cityClass), //used to be tripClass
             trip = tripSelect.val(), //figure out which trip they're going on
             hotelSelect = tripSelect.parents('form').find(hotelClass); //set the var for the dropdown box for Hotel Room Option

            if (trip !== undefined && trip !== "") {
                if (trip === "none"){ //if no trip, show no options
                    jQuery(hotelClass+" > option").each(function() {
                        jQuery(this).clone().appendTo(unusedClass);
                        jQuery(this).remove();
                    }); 
                } else { //if it has a trip
                    tripnum =  trip.match(/JWRP (\w*) /)[1]; //set tripnum to be the # of that trip

                    // GET ALL OPTIONS THERE
                    jQuery(unusedClass+" > option").each(function() { //for each option in the Unused box
                        jQuery(this).clone().appendTo(hotelClass); //move it to this trip (all)
                        jQuery(this).remove();
                    });

                    // REMOVE BAD OPTIONS
                    jQuery(hotelClass+" > option").each(function() { //for each option in the Hotel box
                        hotelMatch = jQuery(this).val().match(/(\w*) /); //pull out the tripnum from the option
                        
                        if(jQuery(this).val() != "Other|0"){ // if it's not Other
                            if (hotelMatch === null || hotelMatch[1] != tripnum){ //if this option doesn't match this trip
                                jQuery(this).clone().appendTo(unusedClass); //get rid of this option 
                                jQuery(this).remove();
                            };
                        }else{
                            //jQuery(this).appendTo(hotelClass); //if the option is Other, keep it
                        };
                    });


                    //jQuery(hotelClass + 'option[value="Other|"]').insertAfter(hotelClass + 'option:last-child'); //move the Other option to the end
                    if (jQuery(hotelClass).val() == '' )
                      {
                        jQuery(hotelClass).val(jQuery(hotelClass + "option:first").val()); //select the first option for Hotels
                      };
                    
                    jQuery(unusedClass).val(jQuery(unusedClass + "option:first").val());//select the first option for Unused (these 2 prevent submission errors)

                }
            }
        }    
jQuery(document).bind('gform_post_render', function(){


    jQuery('.city-date select').change(function(){  //used to be .hotel-trip select
        
        tripFilter()
    });

});