How can I debug javascript code on a page while the page is running?

Thanks,

Victor

<lasalsatx@newsgroups.nospam> wrote in message
Use the JavaScript debugger method...

E.g.

<script>

var strMessage="Hello";
debugger;
alert(strMessage);

</script>

Run your app in debug mode (F5, not Ctrl-F5), and execution will stop on the
debugger; line.

Hi,

Mark Rae wrote:
Show quoteHide quoteI would rather recommend a method which doesn't need to modify the
source code: Simply put a breakpoint in the code...

HTH,
Laurent

You're right, of course. It's an old (and, no doubt, bad) habit of mine from
back in the day when this was the only reliable way of debugging
JavaScript...

Did you ever try to set a breakpoint in JavaScript in Visual Studio 6...?
Show quoteHide quote

Hi,

Mark Rae wrote:
Show quoteHide quoteNever had to do that ;-)

Back in the days, I was using Venkman only for debugging, and before
that the Netscape javascript debugger (or whatever it was called) and
before that.... the old "alert" methods ;-)

Greetings,
Laurent

Hi

I always get "This is not a valid location for a breackpoint" when ever I
try to insert a break point on the aspx html code. Any ideas?

thanks,

Victor


Show quoteHide quote

Hi,

lasalsatx@newsgroups.nospam wrote:
In my experience, setting breakpoints in inline JavaScript code doesn't
always work. The best is to place your JavaScript code in external JS
files. This has many other advantages too anyway (files are cached,
modularity, reusability...).

HTH,
Laurent

thanks that took care of the problem.

Victor

Show quoteHide quote

JavaScript code can be debugged, but not in the same way as ASP.Net, because
it is client-side code. For debugging JavaScript, you set up Internet
Explorer to allow JavaScript debugging, use the Tools|Options menu, and the
Advanced tab. Uncheck the "Disable Script Debugging (Internet Explorer)"
item. Then, when a bug occurs in client-side JavaScript, IE will allow you
to launch a debugger to debug the script (usually Visual Studio). You can
also set a break point in JavaScript by adding the following line of
JavaScript where you want the debugger to break:

debugger;

Show quoteHide quote

Hi,

Kevin Spencer wrote:
True but incomplete. You can set breakpoints in client-side JavaScript
code using F9 and *without* modifying the code by adding the debugger
statement. That would be the recommended way.

Similarly, you can also attach the VS2005 debugger to a running instance
of IE and debug the client-side code, even if the page is served by a
remote sever.

In that sense, it's very similar to ASP.NET, except that the code runs
in another process.

HTH,
Laurent

<lasalsatx@newsgroups.nospam> wrote in message
What happens if you use the JavaScript debugger method...?

In IE, tools options advanced, ensure that disable script debugging is
unchecked.

in VS, debug to your page and once loaded, you can either go to debug ->
windows - runing documens  or  use CTRL-ALT-N to bring up the script
explorer, you then select the page you want to debug and then you can set
breakpoints in the js and when the breakpoint is hit, step through it.

-Adrian

(for some reason the running docs window is missing on my VS, so I use the
CTRL-ALT-N approach)

<lasalsatx@newsgroups.nospam> wrote in message
Show quoteHide quote

Hi Victor,

Besides other community member's useful input, you may also checkout
following articles:

#How to: Enable Client-Side Script Debugging
http://msdn2.microsoft.com/en-us/library/k2h50zzs.aspx

I hope this helps. Please feel free to post here if anything is unclear.

Sincerely,
Walter Wang (waw***@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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