Place this line where you want to print the stack trace:

    console.log(new Error().stack);


**Note:** tested by me on **Chrome 24** and **Firefox 18**

May be worth taking a look at [this tool][1] as well.


  [1]: https://github.com/ebobby/tracing.js

Webkit now has functionality that provides stack traces:

[Web Inspector: Understanding Stack Traces][1], posted by Yury Semikhatsky on Wednesday, April 20th, 2011 at 7:32 am (webkit.org)


From that post:

&lt;img src=&quot;https://www.webkit.org/blog-files/inspector/stack-traces-img/4.png&quot;/&gt;


  [1]: http://www.webkit.org/blog/1544/web-inspector-understanding-stack-traces/

If you want the string stack trace, I&#39;d go with insin&#39;s answer: [stacktrace.js][1]. If you want to access the pieces of a stacktrace (line numbers, file names, etc) [stackinfo][2], which actually uses stacktrace.js under the hood.

  [1]: http://www.stacktracejs.com/
  [2]: https://github.com/fresheneesz/stackinfo

You must try good open source library [TraceKit](https://github.com/csnover/TraceKit/) which attempts to create stack traces for unhandled JavaScript exceptions in all major browsers. You can read more about Tracekit

   https://github.com/csnover/TraceKit/


**PS**: If you are looking for a service(using Tracekit) with good UI, you can try [Atatus](https://www.atatus.com).
 
[Disclosure] I work at Atatus.


Not really, at least not easily.

In IE, you can debug the browser process with MS Script Debugger (which for some reason is an Office component) or Visual Studio, and then you can see the stack on breakpoints.

In the GNOME Terminal, Bash does smart auto-completion. For example

    apt-get in&lt;TAB&gt;

becomes

    apt-get install

In Emacs shell-mode, this auto-completion doesn&#39;t work, even after I explicitly source `/etc/bash_completion`. The above example sticks as `in` or auto-completes with a filename in the current directory rather than a valid `apt-get` command option. Presumably, this is because Emacs is intercepting the Tab key-press. How do I enable smart auto-completion in `shell-mode`?

Bash autocompletion in Emacs shell-mode

We are writing a complex rich desktop application and need to offer flexibility in reporting formats so we thought we would just expose our object model to a scripting langauge. Time was when that meant VBA (which is still an option), but the managed code derivative VSTA (I think) seems to have withered on the vine.

What is now the best choice for an embedded scripting language on Windows .NET?


What is the best scripting language to embed in a C# desktop application?

In Firefox I can get the stack trace of an exception by using `exception.stack`.

Is there a way to get that in other browsers, too?

&lt;b&gt;Edit:&lt;/b&gt; I actually want to save the stack trace automatically (if possible) and not debug it at the time (i.e. I know how to get the stack trace in a debugger).

Javascript exception stack trace

In Firefox I can get the stack trace of an exception by using <code>exception.stack</code>.
Is there a way to get that in other browsers, too?
Edit: I actually want to save the stack trace automatically (if possible) and not debug it at the time (i.e. I know how to get the stack trace in a debugger).

I am building an application where I want to be able to click a rectangle represented by a DIV, and then use the keyboard to move that DIV by listing for keyboard events.

Rather than using an event listener for those keyboard events at the document level, can I listen for keyboard events at the DIV level, perhaps by giving it keyboard focus?

Here&#39;s a simplified sample to illustrate the problem:

    &lt;html&gt;
    &lt;head&gt;
    &lt;/head&gt;
    &lt;body&gt;
    
    &lt;div id=&quot;outer&quot; style=&quot;background-color:#eeeeee;padding:10px&quot;&gt;
    outer
    
       &lt;div id=&quot;inner&quot; style=&quot;background-color:#bbbbbb;width:50%;margin:10px;padding:10px;&quot;&gt;
       want to be able to focus this element and pick up keypresses
       &lt;/div&gt;
    &lt;/div&gt;
    
    &lt;script language=&quot;Javascript&quot;&gt;
    
    function onClick()
    {
    	document.getElementById(&#39;inner&#39;).innerHTML=&quot;clicked&quot;;
    	document.getElementById(&#39;inner&#39;).focus();
    
    }
    
    //this handler is never called
    function onKeypressDiv()
    {
    	document.getElementById(&#39;inner&#39;).innerHTML=&quot;keypress on div&quot;;
    }
    
    function onKeypressDoc()
    {
    	document.getElementById(&#39;inner&#39;).innerHTML=&quot;keypress on doc&quot;;
    }
    
    //install event handlers
    document.getElementById(&#39;inner&#39;).addEventListener(&quot;click&quot;, onClick, false);
    document.getElementById(&#39;inner&#39;).addEventListener(&quot;keypress&quot;, onKeypressDiv, false);
    document.addEventListener(&quot;keypress&quot;, onKeypressDoc, false);
    
    &lt;/script&gt;
    
    &lt;/body&gt;
    &lt;/html&gt;

On clicking the inner DIV I try to give it focus, but subsequent keyboard events are always picked up at the document level, not my DIV level event listener.

Do I simply need to implement an application-specific notion of keyboard focus?

I should add I only need this to work in Firefox.

How can I give keyboard focus to a DIV and attach keyboard event handlers to it?

If I have a script tag like this:


    &lt;script
        id = &quot;myscript&quot;
        src = &quot;http://www.example.com/script.js&quot;
        type = &quot;text/javascript&quot;&gt;
    &lt;/script&gt;

I would like to get the content of the &quot;script.js&quot; file. I&#39;m thinking about something like `document.getElementById(&quot;myscript&quot;).text` but it doesn&#39;t work in this case.

How can I get the content of the file specified as the &#39;src&#39; of a &lt;script&gt; tag?

I&#39;ve always handled optional parameters in JavaScript like this:

    function myFunc(requiredArg, optionalArg){
      optionalArg = optionalArg || &#39;defaultValue&#39;;

      // Do stuff
    }

Is there a better way to do it?

Are there any cases where using `||` like that is going to fail?


Is there a better way to do optional function parameters in JavaScript?

I would like to format a price in JavaScript. I&#39;d like a function which takes a `float` as an argument and returns a `string` formatted like this:
 
    &quot;$ 2,500.00&quot;

What&#39;s the best way to do this?


How to format numbers as currency strings

Using jQuery, how do you check if there is an option selected in a select menu, and if not, assign one of the options as selected.

(The select is generated with a maze of PHP functions in an app I just inherited, so this is a quick fix while I get my head around those :)


Check if option is selected with jQuery, if not select a default

In C# code can you catch a native exception thrown from deep in some unmanaged library? If so do you need to do anything differently to catch it or does a standard try...catch get it?

Can you catch a native exception in C# code?

How can I use JUnit4 idiomatically to test that some code throws an exception?

While I can certainly do something like this:

    @Test
    public void testFooThrowsIndexOutOfBoundsException() {
      boolean thrown = false;
    
      try {
        foo.doStuff();
      } catch (IndexOutOfBoundsException e) {
        thrown = true;
      }
    
      assertTrue(thrown);
    }

I recall that there is an annotation or an Assert.xyz or *something* that is far less kludgy and far more in-the-spirit of JUnit for these sorts of situations.

How do you assert that a certain exception is thrown in JUnit 4 tests?

The more we use RAII in C++, the more we find ourselves with destructors that do non-trivial deallocation. Now, deallocation (finalization, however you want to call it) can fail, in which case exceptions are really the only way to let anybody upstairs know of our deallocation problem. But then again, throwing-destructors are a bad idea because of the possibility of exceptions being thrown during stack unwinding. `std::uncaught_exception()` lets you know when that happens, but not much more, so aside from letting you log a message before termination there&#39;s not much you can do, unless you&#39;re willing to leave your program in an undefined state, where some stuff is deallocated/finalized and some not.

One approach is to have no-throw destructors. But in many cases that just hides a real error. Our destructor might, for example, be closing some RAII-managed DB connections as a result of some exception being thrown, and those DB connections might fail to close. This doesn&#39;t necessarily mean we&#39;re ok with the program terminating at this point. On the other hand, logging and tracing these errors isn&#39;t really a solution for every case; otherwise we would have had no need for exceptions to begin with. 
With no-throw destructors we also find ourselves having to create &quot;reset()&quot; functions that are supposed to be called before destruction - but that just defeats the whole purpose of RAII.

Another approach is just to [let the program terminate][1], as it&#39;s the most predictable thing you can do.

Some people suggest chaining exceptions, so that more than one error can be handled at a time. But I honestly never actually seen that done in C++ and I&#39;ve no idea how to implement such a thing.

So it&#39;s either RAII or exceptions. Isn&#39;t it? I&#39;m leaning toward no-throw destructors; mainly because it keeps things simple(r). But I really hope there&#39;s a better solution, because, as I said, the more we use RAII, the more we find ourselves using dtors that do non-trivial things.

**Appendix**

I&#39;m adding links to interesting on-topic articles and discussions I&#39;ve found:

  - [Throwing Destructors][2]
  - StackOverflow discussion on the [problems with SEH][3]
  - StackOverflow discussion on [throwing-destructors][4] (thanks, Martin York)
  - [Joel on Exceptions][5]
  - [SEH Considered Harmful][6] 
  - [CLR Exception Handling][7] which also touches on exception chaining
  - [Herb Sutter on std::uncaught_exception][8] and why it&#39;s not as useful as you think
  - [Historical discussion][9] on the matter with interesting participants (long!)
  - Stroustrup explaining [RAII][10]
  - Andrei Alexandrescu&#39;s [Scope Guard][11]


  [1]: http://www.kolpackov.net/projects/c++/eh/dtor-1.xhtml
  [2]: http://www.kolpackov.net/projects/c++/eh/dtor-1.xhtml
  [3]: https://stackoverflow.com/questions/164372/is-there-a-good-way-around-the-problems-of-structured-exception-handling-try-ex
  [4]: https://stackoverflow.com/questions/130117/throwing-exceptions-out-of-a-destructor#130123
  [5]: http://www.joelonsoftware.com/items/2003/10/13.html
  [6]: http://blogs.msdn.com/larryosterman/archive/2004/09/10/228068.aspx
  [7]: http://bartdesmet.net/blogs/bart/archive/2006/04/04/clr-exception-handling-from-a-to-z-everything-you-didn-t-want-to-know-about-try-catch-finally-fault-filter.aspx
  [8]: http://www.gotw.ca/gotw/047.htm
  [9]: http://www.cpptalk.net/1-vt12438.html?postdays=0&amp;postorder=asc&amp;start=0
  [10]: http://www.research.att.com/~bs/bs_faq2.html#finally
  [11]: http://www.ddj.com/cpp/184403758

RAII vs. exceptions

Here&#39;s a curious one. I have a class A. It has an item of class B, which I want to initialize in the constructor of A using an initializer list, like so:

    class A {
        public:
        A(const B&amp; b): mB(b) { };
        
        private:
        B mB;
    };

Is there a way to catch exceptions that might be thrown by mB&#39;s copy-constructor while still using the initializer list method? Or would I have to initialize mB within the constructor&#39;s braces in order to have a try/catch?

Catching exceptions from a constructor&#39;s initializer list

Does C++ support &#39;[**finally**][1]&#39; blocks?

What is the [**RAII idiom**][2]?

What is the difference between C++&#39;s RAII idiom and [**C#&#39;s &#39;using&#39; statement**][3]?

  [1]: http://java.sun.com/docs/books/tutorial/essential/exceptions/finally.html

  [2]: http://en.wikipedia.org/wiki/Resource_Acquisition_Is_Initialization

  [3]: http://www.c-sharpcorner.com/uploadfile/dipalchoksi/usingstatement11092005065819am/usingstatement.aspx




Content Type	Original Author	Original Content on Stackoverflow
Question	ujh	View Question on Stackoverflow
Solution 1 - Javascript	Francesco Casula	View Answer on Stackoverflow
Solution 2 - Javascript	Brian M. Hunt	View Answer on Stackoverflow
Solution 3 - Javascript	B T	View Answer on Stackoverflow
Solution 4 - Javascript	Fizer Khan	View Answer on Stackoverflow
Solution 5 - Javascript	levik	View Answer on Stackoverflow

Javascript exception stack trace

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

Solution 2 - Javascript

Solution 3 - Javascript

Solution 4 - Javascript

Solution 5 - Javascript

What is the best scripting language to embed in a C# desktop application?

Bash autocompletion in Emacs shell-mode

Attributions