Autofill Text Field Value with Current Page URL

All I am looking to do is autofill a hidden text field with the current page URL, so that when the开发者_开发问答 user submits the form, I know the page they sent the form from. This will save me a ton of headaches dealing with inquiries.

In other words, when the page loads, I'd need the text field value to be value="http://www.example.com/"

Ideally, looking to accomplish this with just Javascript/HTML.

Any help would be much appreciated. Thanks!

---

Assuming you can give your hidden field an ID, put the following in your onload or document-ready processing:

document.getElementById("yourHiddenFieldId").value = window.location.href;