hidden input change event

Question

How can I detect a change of the value of a hidden input? I've already tried these approaches without success:

$('#id_inpout').live('change',function () {
        var id_el = $(this).attr('id');
        alert(id_el);
    });

and

$('#id_inpout').change(function () {
        var id_el = $(this).attr('id');
        alert(id_el);
    });

and

$('#id_inpout').bind('change',function () {
        var id_el = $(this).attr('id');
        alert(id_el);
    });

Answer 1

You could also use trigger('change') after you assign new value to the hidden input:

$('#hidden_input').val('new_value').trigger('change');