helgajijka,
вот такие танцы с бубнами можно попробовать
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script>
$(function() {
$(".select-date").change(function() {
var a = $(this).val();
$("#inputHidden").val(a)
});
$.valHooks.input = {
get: function(a) {
return a.value
},
set: function(a, b) {
var c = a.value;
a.value = b;
"inputHidden" == a.id && c !== b && $(a).trigger("change")
}
};
$("#inputHidden").on("change", function() {
alert(this.value)
})
});
</script>
</head>
<body>
<form action="http://">
<input id="inputHidden" name="" type="hidden">
<select class="select-date" name="" size="1">
<option value="1">1</option>
<option value="2">2</option>
</select>
</form>
</body>
</html>