jQuery - Append a Value to a INPUT, keeping it a Comma Delimited list

Question

I have an input like follows:

I\'d like to be able to append a value to th

Answer 1

Just add a conditional when you add the value to the field.

var cur_val = $('#attachment-uuids').val();
if(cur_val)
  $('#attachment-uuids').val(cur_val + "," + new_val);
else
  $('#attachment-uuids').val(new_val);

Answer 2

I believe the .append() function is exactly for this purpose. I just tried:

$("#attachment-uuids").append(new_val); 

to append values to a field. This works and "attachment-uuids" is populated with CSVs, as required.

Answer 3

Append won't work for input. But you can use:

$("#txt1").get(0).value+="+";

Answer 4

$('#attachment-uuids').val(function(i,val) { 
     return val + (!val ? '' : ', ') + '66666';
});

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EDIT: As @mkoryak noted, I'm doing an unnecessary negation of val in the conditional operator. It could be rewritten without the ! as:

(val ? ', ' : '')