Data Collection — Page Tagging (JavaScript)
Page tags are snippets of JavaScript code attached to webpages, used for tracking users. Exhibit 27.4 shows an example of Google tag, which is the most widely used page tag.
Here is how page tags work:
- The JavaScript code executes every time a webpage is loaded, regardless of whether it is sourced from cache, proxy server or the website’s server.
- The script calls back the website’s server and passes the user’s information to the server. These call backs are asynchronous, ajax-based, so they do not to impair performance.
- The JavaScript assigns a persistent cookie to store a client ID on the user’s device. When the user revisits the page, the stored ID identifies the user, provided the cookie has not been deleted.
- If data is collected through a third party such as Google Analytics, the data is passed onto that party’s server. For tracking purposes, the service provider will assign a site ID. For example, in Exhibit 27.4, the ID G-LRJ5T7W3QL is assigned to the site www.ashokcharan.com.
Page tagging is a big improvement over server logs, yet it too has drawbacks. The most significant issue is the deletion of cookies. Whenever cookies are deleted, repeat users are counted as new users, leading to inaccurate tracking.
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