testing for a null variable.
Printed From: Web Wiz Forums
Category: General Discussion
Forum Name: Classic ASP Discussion
Forum Description: Discussion on Active Server Pages (Classic ASP).
URL: https://forums.webwiz.net/forum_posts.asp?TID=183
Printed Date: 28 March 2026 at 10:23pm
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: testing for a null variable.
Posted By: Nathan
Subject: testing for a null variable.
Date 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 |
Replies:
Posted By: MadDog
Date 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 ------------- http://www.iportalx.net" rel="nofollow"> 
|
Posted By: Nathan
Date Posted: 17 February 2003 at 2:19pm
| Thanks MD, I'll give it a go - looks like it will work. |
Posted By: MorningZ
Date 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"  ------------- Contribute to the working anarchy we fondly call the Internet |