Custom Input Mask for a valid URL

I don't know of an input mask to verify that what is entered is a fully qualified domain name. The regular expression to validate a URL is pretty complex in itself (here is one example http://stackoverflow.com/a/11811798 ), and the input mask can't be used with a regular expression. Validating the data that was input is different than forcing a specific format.

You can use the gform_pre_submission_filter to check the data that was input, and add http:// to the beginning if the string does not being with http:// already.

http://www.gravityhelp.com/documentation/page/Gform_pre_submission_filter

You could also use a regular website (URL) field (in the form builder) then copy that from the URL field to the post custom field, again using the gform_pre_submission_filter. That way, you would have the benefit of the URL validation that Gravity Forms applies to website inputs.

The post custom field could be marked admin only so it would not appear in your preview. Do you still want to use the method of checking for http and if it's not there, add it? If you are using a submission preview, the value is likely to be incorrect when displayed, either way we do it. Is that OK (that the value display just as it was entered)?

Take a look at this code: http://pastebin.com/LyKCMYbB

That code will go in your theme's functions.php. You will need to change the ID of the form on line 4 and the ID of the custom field input where you accept the URL on lines 10 and 20.

There is no (or at least a very minimal) performance hit to repeat the function 11 times. However, you will need to rename each function so that the function name is not declared multiple times (which will result in a fatal error.) See below though for a different way.

You could leave off the form ID and have one filter line, then in your function, tie the form ID to a field ID, and then run the code based on that. Basically, on line 6, you would check to see if the current form ID is one of the forms you need to run this function for. Then, if the form ID matches, assign the field ID to a variable.

Take a look at this code: http://pastebin.com/iFZKhM6B

You will need to change the $formfields array to hold all your form ID and the field ID for the URL field you want to check in each form. I only listed 4 forms, but you have 11 to do.

[php]
// follow this format
'formID' => 'fieldID'

Replace the old function and filter call with this one and let us know how it goes.