JS aggregation

I have enabled advanced aggregation.

When i enable JS aggregation in the performance page and clear the cache, the it throws error in the console and that prohibits further execution of JS in the page.

I have added JS file to a page through a custom module. The JS file has some code which calls some function loaded through some internal JS libraries. I get error as function is undefined.

Example error :

• "TypeError: Drupal.ajax is undefined"
• "TypeError: $(...).functionname is not a function"

The module advagg creates a folder in the filesystem as "advagg_js" and after enabling aggregation it combines the content of multiple JS files into a single js file.

I am confused the way it combines and loads it in the page.

Can somebody throw some light in this regard?

Thanks,
Nisith