Question

I have in console(Ctrl+J) chorme as error:

Uncaught TypeError: Cannot call method ‘reverse’ of null

In following code:

///normal number formatting/////////////////////////////////////////////////////////////////////////////////////////    
$(document).delegate('input.numeric:text', 'keyup', function () {
    $val = $(this).val().match(/[0-9]/g).reverse().join("").match(/[0-9]{1,3}/g).join(",").match(/./g).reverse().join("");
    $(this).val($val)
});

How fix this error?

Answer 1

The error says that this part returns null:

$(this).val().match(/[0-9]/g)

The value contains no numbers. I suggest you validate:

$(document).delegate('input.numeric:text', 'keyup', function () {
    $val = $(this).val().match(/[0-9]/g);

    if ($val) {
      $(this).val($val.reverse().join("")
                      .match(/[0-9]{1,3}/g).join(",")
                      .match(/./g).reverse().join(""));
    }
});