Re: How can I check to see if a variable has been defined

From: ALAN MEBAN <AMEBAN_at_bfsec.bt.co.uk>
Date: 31 Aug 1993 03:44:33 -0500
Message-ID: <930831093728.20820e1d_at_bfsec>


Thanks to all those who replied with postings, or with email. A summary follows:

Use 'default_value' ... though be careful of the syntax. The following actually works:

    default_value('ZOT', 'global.var');
    if :global.var = 'ZOT' then

       erase('global.var');
       bell;
       message('Oh no you don''t ...');
       exit_form(NO_COMMIT);

   end if;
  • continue with :global.var defined ...

Note the syntax of default_value:

   default_value (<substitution value>, <variable in quotes & no colon>)

Once again, many thanks.

Alan Meban / ameban_at_bfsec.bt.co.uk


   "My views, not theirs ..." Received on Tue Aug 31 1993 - 10:44:33 CEST

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