[TYPO3-formidable] how to get the $_GET params from url

[Domi Garms]

Good Morning,

Im just searching for a quick method for getting the $_GET param from
a given url. I want to use it in an onclick ajax event and in the
sandBox but $_GET[] or $this->oParent->t3slib::GP() is not working. I
was trying around but all my methods are very circuitous...

Thanks a lot

Domi