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Being Verbose - Zope

Ever wondered if there was a way to stop Zope from barfing error messages all over your screen when one of your scripts crashes and burns? Well, guess what - there is! Meet the and tags, which can be used to trap and resolve errors in script execution.

  1. Exception Handling In DTML
  2. Anatomy Class
  3. Playing Catch
  4. Being Verbose
  5. All For One...
  6. ...And One For All
  7. The Final Solution
  8. Raising The Bar
  9. Pre-Packaged Python
  10. Endzone
By: Harish Kamath, (c) Melonfire
Rating: starstarstarstarstar / 1
August 13, 2002

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Now, what you just saw was a very primitive exception handler, albeit one which isn't very useful on a production site. Ideally, you'd want the message generated by the exception handler to be a little more descriptive, and to contain some information on the source of the error.

DTML satisfies this requirement via two special, pre-defined variables - the "error_name" and "error_type" variables. Take a look:

<dtml-try> <dtml-var CheckThisOut> <dtml-except> <b>Something's wrong here! But what?</b><br> This might help:<br> Error type - <i><dtml-var error_type></i> <br> Error value - <i><dtml-var error_value></i> </dtml-try>
Here's the output:

Something's wrong here! But what? This might help:Error type - KeyErrorError value - CheckThisOut
And if you flip back a couple of pages to the very first code snippet in this article, you'll notice a remarkable similarity between the default Zope error output, and that of the script above...not surprising, considering that Zope's default error screen also uses the same two variables.

>>> More Zope Articles          >>> More By Harish Kamath, (c) Melonfire

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- ZPT Basics (part 3)
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- DTML Basics (part 4)
- DTML Basics (part 3)
- DTML Basics (part 2)
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