Don't work my jQuery code after append. how can just change js code and worked it?

I don't use from ides "#aaa or #sss", How do without use them?

**DEMO: <http://jsfiddle.net/sq4kx/>**

html:

```
<a href="" class="qqq">Click Me</a>
<div id="aaa">
    <div id="sss">
    </div>
</div>

```

jQuery:

```
$('.qqq').on('click', function (e) {
    e.preventDefault();
    $('#sss').empty().append('After typed must result alert: "This is ok" !??<div class="auto_box"><input name="we" class="de1"></div>');
})
$('.auto_box').on('keyup change', '.de1', function () {
    alert('This is ok');
})

```