Obtain Original First Entry URL Href Hit While User Keeps Navigating between Different Pages

Question

Background: I have a website, say https://example.com , which has different pages. Eg user firstly came to the site with URL https://example.com/page-a?utm=google , then user continue browsing other pages eg /page-b, /page-c.

Problem: In other pages, eg, /page-b, how can I know the user's original first hit URL (which is https://example.com/page-a?utm=google ). Can I obtain from the browser easily?

Thank you very much.

Answer 1

I have investigated this one for quick a bit. And I think this trick can help the case. Apply the session Storage logic to each page, so add the following code to each page of the website:

<script>
  if (!sessionStorage.getItem("entryURL")) {
    sessionStorage.setItem("entryURL", document.location.href);
  }
</script>

Then in each page, can access from sessionStorage.getItem("entryURL")