jquery array how to get a key that has an empty value

Question

i have an array with some keys and values pair.

i'm checking if there is a key that has empty value and if so I would like to know how to get this key :

$(form).on('submit',function() {
 var arr = {};
 var elemRequired = $(this).find('input:not(input[type=button], input[type=submit], input[type=reset]),textarea,select,checkbox').filter(':visible');
 $('.error').empty();
 elemRequired.each(function(i, el) {
 arr[el.id] = el.value;
 });
 $.each(arr, function(id, val) {
 if (val == ""){
 /*here i want to get the id that has the empty value*/ 
 id.addClass('invalid');
 }else{
 }
 });
 return false;
});

i know ther might be other way to do this but i want to know if there's a way to do it like that

thanks for the help

• Bhushan Kawadkar: do you want to add invalid class to element which has id empty?
• Maurice Perry: Is it working or not?
• monkey: yep that's what i want

Answer 1

Put this

 $('#'+id).addClass('invalid');

instead of this

id.addClass('invalid');