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testing for a null variable.
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Nathan View Drop Down
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Joined: 08 January 2002
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    Posted: 15 February 2003 at 12:55am

I use a chat script for my site. If no one is chatting, then one variable has a null value. Of course if I try to reference the variable (which I do to display how many are chatting) I get a script crash. How can I 'test' if a variable is null first?

I assume:

if chatters=null then

else

end if

 

(but this does not seem to work)

Cheers

Nathan
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MadDog View Drop Down
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Joined: 01 January 2002
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Points: 3008 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MadDog Quote  Post ReplyReply Direct Link To This Post Posted: 15 February 2003 at 12:58am

Do something like this... (i believe the IsNull() will work)

If IsNull(chatters) = True Then

Else

End If
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Nathan View Drop Down
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Points: 160 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Nathan Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2003 at 2:19pm
Thanks MD, I'll give it a go - looks like it will work.
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MorningZ View Drop Down
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Points: 1793 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MorningZ Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2003 at 2:44pm
i always do it this way

if (chatter & "") = ""
   'is empty
else
   isn't
end if

then there is no seperate check needed for NULL or
"empty string"

Edited by MorningZ
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