Question

My database consists of some entries which are null (so they don’t affect max, min, etc..). When I pull all of the data from the database, I need to repopulate form fields with the values. Using .val(value) where value = null seems to work without any problems, but I’m not sure if this is a valid way to go about this. It doesn’t say anything in the jQuery documentation (that I can find) about using null as parameters to functions.

Edit: Changed NULL to null. I was still in PHP mode and that was a typo.

Answer 1

Different functions handle it in different ways, but for .val() specifically, yes, this is perfectly valid:

$(".selector").val(null);

If you look at the .val() source, you can see null is converted to an empty string, "" before it’s used:

if ( val == null ) {
  val = "";
}