Generate Error Page

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# Generate Error Page

Subroutine Name | Executable Example | Viewable Example
--- | --- | ---
W3ERROR W3ERROR-TEMPLATE W3ERROR-TEMPLATE-XML W3ERROR-TEXT | E3ERROR | E3ERROR

> Description

>   Errors generated by the Natural runtime should be handled to avoid screen output. Therefore, an `ON ERROR` section must be added to all programs called with the Natural Web Interface. The PDA `W3CONST` must be added as well.

>   The subroutine W3ERROR-TEMPLATE is called if an error occurs. This routine can be changed for your own needs.

>   The subroutine W3ERROR-TEMPLATE-XML returns the error page as XHTML page. This routine can be changed for your own needs. To activate this template, uncatalog W3ERROR-TEMPLATE and rename the subroutine from W3ERROR-TEMPLATE-XML to W3ERROR-TEMPLATE and stow.

>   The subroutine W3ERROR-TEXT is for internal use only.

> Parameters

>       1 ##W3ERROR
>         2 NR         (I4)   /* i /m : Number of the error
>         2 LINE       (I4)   /* i /m : Line in the Natural program
>         2 SUBPROGRAM (A008) /* i /m : Subprogram name
>         2 SUBROUTINE (A032) /* i /m :  Subroutine name
>         2 TEXT       (A250) /* i /m : Error text

> How To Invoke

>       ON ERROR
>         PERFORM W3ERROR ##W3ERROR
>         PERFORM W3END ##RPC
>         ESCAPE ROUTINE
>       END-ERROR