Writing Debug Messages to the Javascript Console

[ion]

Hi!
Is there a way to write messages to the javascript console? Like a
debug.write() method?
Thanks!
Ion

 

[Nathan]

if you're talking about the Mozilla/Firefox javascript console, there's
a pretty good wiki document over at mozillazine:

http://kb.mozillazine.org/JavaScript_Console

looks like the easiest way is to do it like this:

consoleService.logStringMessage("Hello world!");

 

[ion]

Nathan,
Thanks. I couldn't get that to work. I get
Permission denied to get property UnnamedClass.classes
I think that service is intended for XUL applications. Is there no
way to write to it with JavaScript? There's a filter for 'messages
only' in the JavaScript Console itself, so it seems to want to be
written to.
Ion

 

[ion]

OK, Neil provides the answer in
http://groups-beta.google.com/group...pt+console+setTimeout&rnum=2#67ef5e734f6f2123
var message = "Hello, world!";
setTimeout(message, 0);

since "Hello, world!" isn't resolvable as a method call, this gets
logged as an error [I get 'Missing ; before statement', but it would
probably be different for a single word message.]

 

[Hallvord R. M. Steen]

Is there a way to write messages to the javascript console? Like a
debug.write() method?

You got an answer for Mozilla already

If you debug your script in Opera you can use

opera.postError();

 

[caston]

Hi!
Is there a way to write messages to the javascript console? Like a
debug.write() method?
Thanks!
Ion

The best way to write to debug console is the follwoing:

throw new Error("An error occured bla-bla...")

Note, that using this construction will cause an error alert in IE
browser, and will write to javascript console in Mozilla-based
browsers.
In both cases the script flow will be interrupted after the error
arisen.

 

[ion]

caston,
Thanks! I don't want to leave the method body, is why I'm not
throwing errors.
Ion

 

[ion]

Dude! Opera rules! It's unfortunately not a supported platform for my
application. Tough to make the business case.
Thanks for your help!

 

[Thomas 'PointedEars' Lahn]

Thanks! I don't want to leave the method body, is why I'm not
throwing errors.

Theoretically, you could re-catch the exception thrown, see
the JavaScript 1.5 Guide and/or Reference for details.

<http://web.archive.org/devedge.netscape.com/central/javascript/>


PointedEars

 

[ion]

Thomas,
Thanks! If I caught the errors, they wouldn't be logged. The funny
thing about the 1.5 Guide's discussion of exception handling is that
they put a function 'logMyErrors' in the catch block, without giving an
implementation. All I want to do, of course, is log errors, so there
you are.
setTimeout is working great for me.

 

[ion]

Thomas,
Thanks! If I caught the errors, they wouldn't be logged. The funny
thing about the 1.5 Guide's discussion of exception handling is that
they put a function 'logMyErrors' in the catch block, without giving an
implementation. All I want to do, of course, is log messages, so there
you are.
setTimeout is working great for me.