Here’s the updated guide: https://www.jotform.com/help/95-capture-the-page-url-where-the-form-is-embedded
The first thing you need to do is insert a Hidden Box into your form. You can find it under the Widgets section of the Form Builder.
Name that box with something that’s easy to remember. Let’s say, “website“.
Get your iframe embed code.
Append this piece of code: “?website=google” at the end of the URL so it becomes
Replace google with any identifier, i.e. your website’s name.
Embed your form.
As an example, filling out this form with the url parameters ?website=google
sends me this notification email: