Question

I want to make a javascript (or jquery) function that works onChange and allow only to write 3 numbers : 5, 15 or 25

If the user write an other value (example 3 or 4…), the input have to be reset to 0

How can I do that?

Answer 1

This should help, if you are using jQuery:

$('.myField').change(function() {
  var field = $(this);
  var values = new Array("5", "15", "25");

  $.inArray(field.val(), values) >= 0 ? /* Everything is ok */ : field.val("0");
});

I’m not sure if change() will give you strange performance issues. It if does, try blur().

Hope that helps.