How to set JavaScript breakpoints in Visual Studio 2008 or Visual Studio 2010

Question

I'm trying to debug JavaScript code using Visual Studio 2010, but I can't set breakpoints.

How can I do this?

I just noticed something, every time I try to call a function, no matter what function, in JavaScript, somehow jQuery and Microsoft's Ajax framework JavaScript captures it and checks if the document is ready (document.onready or other) and never returns the control back to the function I'm calling! Why on earth is it doing this? I've never asked for it to!

All I have are references to these libraries, script/link references as you do on the top of your master page.

This is ridiculous, how do I fix it?

try using the notifyScriptLoaded call at the bottom of your script files msdn.microsoft.com/en-us/library/bb310952.aspx — Dave Archer
– Dave Archer, Commented Feb 12, 2010 at 13:31

kime waza · Accepted Answer · 2010-02-12 12:10:30Z

19

If your script is in a separate script file (.js), then you can just use F9 to set a breakpoint on a line.

You can't set a breakpoint if the script is incorporated in another file like an aspx file. For cases like that, use the debugger; javascript statement to force a break at a certain spot.

Also make sure that you are working with the latest version of your javascript file, do a Ctrl-F5 in IE if necessary to force a fresh reload of the file.

answered Feb 12, 2010 at 12:10

kime waza

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Community · Accepted Answer · 2020-06-20 09:12:55Z

8

Use the debugger; statement before the line where you want to stop execution and debug.

Example

var test = "testString";
debugger; // stops execution and can start debugging
test += "newly added";

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Feb 12, 2010 at 12:07

rahul

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Peter Mortensen · Accepted Answer · 2012-10-25 19:30:31Z

0

If you're attaching to a process, you can specify that you want to attach to script in the dialog that comes up. But then it'll be only script and not managed code.

Just use Firebug in Firefox.

edited Oct 25, 2012 at 19:30

Peter Mortensen

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answered Feb 12, 2010 at 12:11

Dave Archer

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