Capture http referrer url in hidden field

Hi J,

So there are a few simple steps that I can help you with.

FORM SET-UP
You will need a field to put in the referrer URL so that it gets saved to the entries table in Gravity Forms.

1. Create a Hidden Field in your Form. (Hidden FIelds are in the Standard Fields set)
2. Give it a label (Ref URL) - The label isn't important but helpful
3. Under the Advanced Tab, click the check box for Allow Field to be Populated Dynamically
4. Give it a Parameter Name (refurl)

FUNCTIONS.PHP Changes
You will need to create a function to grab the referrer URL and pass it to the hidden field.

#1 - In your theme's function.php file you will need to create a filter using the gform_field_value_$parameter_name hook: http://www.gravityhelp.com/documentation/page/Gform_field_value_$parameter_name

It will look like the following:

add_filter("gform_field_value_refurl", "referral_url");

As you can see, I used the parameter name that I put in above (refurl).

#2 - Next we will need to code the referral_url function to grab the URL and then put it into the hidden field.

function referral_url($form){
	//Grab URL from HTTP Server Var and put it into a variable
	$refurl = $_SERVER['HTTP_REFERER'];

	//Return that value to the form
	return esc_url_raw($refurl);
}

FINAL NOTES
Now, if everything has been done correctly, when the form is loaded, the function will be called to grab the referral page and put the value into a hidden field. Then when you look at your entries, you should see which page lead them to your form.