mootools | Tools , scripts - and what nots

You are using $model which is not defined in the scope.

Try using $this->db->select($sql_stmt);

I added the button to your example, without making it do anything yet. Just, as soon as you hover on a link, the button is shown in the middle of that link, and when you click it, it logs to the console.

Now, there are probably a few things you'll want in the future:

1. Increase the hitbox of the link to make it easier to use;
2. Know which link was clicked, either by writing to a global variable clickedLink, or by re-assigning on('click', ...) inside the on('mouseenter') of the link;
3. Change the data object by adding a new node and calling update either on the entire data set (easy, but computationally expensive) or on the source node and its children.

The problem was solved this way:

Issue is that $.fadeOut() sets display:none on the element, which causes some strange rendering issues in your setTimeout() callback. Works better if you use $.fadeTo() instead:

Looking at the stackm trace of the exception you're getting revelas, that the .render() method that actually gets called is from mootools: