Hacking Blog

    By default widgets are displayed on the pages at the place where you set them initially. How to make widget to be shown only when a user riches bottom of the page and be hidden when user scrolls up? To make a solution easier widgets support callback parameter. Using this parameter you can pass control to your function after widget call has completed. More than that, file http://www.graddit.com/js/graddit-extras.js already contains working callback function. Let's see how it works using top posts widget as an example.

Here's the widget call code (it's being called right from this place):
<div id='callback_example' style='visibility: hidden; display: none; position: fixed; right: 10px; bottom: 10px;'>Read our best!</div><script type="text/javascript" src="http://www.graddit.com/showtop/eng/4?id=callback_example&callback=gradditDisplayWidgetCallback"></script>

The call is here, but you can't see the widget; it's behavior has been changed by gradditDisplayWidgetCallback function. From now on it will be displayed on the right bottom corner of the page when you scroll it all the way down. And disappear when you scroll back up.

    If you'd like to use javascript function from the example above you'll need to include the js file in your template:

<script type="text/javascript" src="http://www.graddit.com/js/graddit-extras.js"></script>

    That's it! Remeber: you need to include graddit-extras.js and set callback function in the widget call code. From time to time I'll be adding some useful functions into graddit-extras.js (check for updates).

    Reminder: widgets layout can be easily changed from the admin panel.