I have some jquery script used to check password strength which changes an img src depending on complexity.

[jsFiddle](https://jsfiddle.net/xh4g44sw/1/)

Which works well within jsfiddle (set to jquery 1.91 - I know I need to get it updated at some point, but don't have time to go over the entire site right now) - on my webpage however, the event isn't being fired.

even going for something more simple:

```
<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script type="text/javascript" src="http://code.jquery.com/ui/1.9.1/jquery-ui.js"></script>
<script type="text/javascript">
    $('#txtNewPass').on('input', function () {
        alert('input');
    });
</script>
<input type="password" id="txtNewPass" runat="server" />

```

the alert doesn't popup. 

I'm sure it is something silly I've overlooked, but I'd appreciate if someone could point it out.

Thanks