Not able to track change in input value

In the template I have a input element.

<input class='qq-edit-caption-selector qq-edit-caption kk-editing' placeholder='Enter Caption here ...' onkeypress='captionUpdate();'>

I want to track the change in the input value,and enable the Update button.Tried below options:

• onkeypress='captionUpdate();'
• Tried jquery change or click on the class

$('.qq-edit-caption').change(function() {
    alert('qq-edit-caption');        
});

Both options does not get fired up!!not sure I have anything issues with my setup or Fine Uploader does not allow that? Please see my screenshot:

Any way to solve this problem with FU?