javascript - Expand if statement -

the code snippet below created have hide or show dropdowns depending on selected. in case below:

**translation** if modelyear <= 67 , assyplant=bf or modelyear >=68  display following dropdowns etc. 

what expand on stating following:

if modelyear <=67 , assyplant =bf or  modelyear <=67 , assyplant =bc or modelyear >=68 display following dropdowns etc etc etc. 

already have following working code:

// model_year + assy_plant logic                 if (thisfield == 'model_year' || thisfield == 'assy_plant') {                     var modelyear = parseint($('#model_year').children('option:selected').text());                     if (isnan(modelyear)) {                         return;                     }                     var assyplant = $('#assy_plant').children('option:selected').text();                      $('tr#row6').css('display', 'none');                     $('tr#row7').css('display', 'none');                     $('tr#row6 select').attr('disabled', 'disabled');                     $('tr#row7 select').attr('disabled', 'disabled');                     if (((modelyear <= 67 && assyplant.tolowercase()) == 'bf')                      || modelyear >=   68) {                         $('tr#row6').css('display', 'table-row');                         $('tr#row6 select').removeattr('disabled');                     } else {                         $('tr#row7').css('display', 'table-row');                         $('tr#row7 select').removeattr('disabled');                     }                 } 

it have add additional assyplant values in future. time.

you can use jquery.inarray() check if assyplant 1 of possible values.

var assyplants = ['bf', 'bc']; // expandable list of assyplant values check  if ((model_year <= 67 && jquery.inarray(assyplant.tolowercase(), assyplants)!==-1)       || model_year >= 68)  { ...