If certain fields have not been filled in, you can use this code to stop a form from being maintained in the browser.
If the user typed in a URL for a form, and that form usually went in some workflow order, the user would be jumping ahead in the workflow (or hacking around). I didn't want them doing either.
So, I added both lines of code to the HTML Head Content area:
@If( ParentID="" ; "<META
http-equiv=refresh content="0; url=" +
Base_DB_Info + "/$$ReturnGeneralError?
openform&MessageString='Unauthorized
URL'">" ; "")+@NewLine
This META tag is included in the <head> if the ParentID field is empty, and redirects the browser to my GeneralError page with the MessageString displayed (you need a field name MessageString on the GeneralError page to show the message).
The page doing the redirecting would show for a moment before the GeneralError page would get retrieved. But it didn't look good, and the user might be inclined to hit the ESC button to try and pull a fast one. So, I added another line at the bottom of the HTML Head Contact area:
@If( ParentID="" ;"HTML
{display:none;}" ; "" ) + @NewLine
This CSS will be included in the <head> tag if ParentID is empty. The whole <html> tag will not be displayed at all. The user gets a white screen, and then the GeneralError page.
What fun dealing with hackers.
One final note: << Base_DB_Info >> is a computed for display field. I got tired of not having the root path to the database, and got more tired of contemplating how relative the relative path was. Here's the computation of Base_DB_Info using other CGI's:
protocol := @If( HTTPS = "ON" ;
"HTTPS://" ; "HTTP://");
domain := @If( Server_Name != "" ;
Server_Name ; "");
dbpathold := @LeftBack(@Left
(Path_Info ; "?") ; "/");
dbpath := @Left(Path_Info ; ".nsf") ;
protocol + domain + dbpath +".nsf"
I also used s.currentdatabase.HttpURL to get the full path to the .nsf.
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