Systems and methods for script injection are shown and described. The method can include intercepting, by a network appliance, a request for a web page from a computing device, transmitting, by the network appliance, the request for a web page to a web server, and intercepting, by the network appliance, a response from the web server, the response including at least a portion of the requested web page. The method can also include injecting, by the network appliance, a script having instructions that when executed by the computing device registers to be notified of the occurrence of a web page event thereby creating a modified response and transmitting the modified response to the computing device that requested the web page.