Read Only - Custom Fields on PMF

Is there a way we can make a Custom Field to be "Read Only"?
Similar to what EB has.

We use this for links to add Query String Parameters coming from another site. 

Thanks. 

Edit the field, there is a setting called Extra Attributes. Enter readonly there and the field will be readonly

Regards,

Tuan

Thanks Tuan,

This worked on Text field.

Is there a way I can make this work also on List or Radio button?
I noticed that this is not applicable to List and Radio.
We also what to apply the query string parameter from their member profile from another system.
Hope we can do it,

Appreciate your help.

Regards.

Unfortunately, readonly are not supported for these field types. It is not supported by browsers, not something with Payment Form

Regards,

Tuan