jQuery If value is NaN

Question

I am having some trouble with an if statement. I want to set num to 0 of NaN:

$('input').keyup(function() {  var tal = $(this).val(); var num = $(this).data('boks'); if(isNaN(tal)) { var tal = 0; } }); 

Answer 1

You have to assign the value back to $(this):

$('input').keyup(function() {  var tal = $(this).val(); var num = $(this).data('boks'); if(isNaN(tal)) { var tal = 0; } $(this).data('boks', tal); }); 

nicely written:

$('input').keyup(function() {     var eThis = $(this);     var eVal = (isNaN(eThis.val())) ? 0 : eThis.val();     eThis.data('boks', eVal); });