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Window.onerror Not Working

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a fair amount of JavaScript and  that is viewed in lots of different browsers (mobile, tablet, desktop). Naturally we want to log our JavaScript exceptions and their stacktraces, just like we log server-side exceptions. It is impossible to test every combination of device and browser so we rely on

Javascript Window.onerror Stack Trace

logging to find the edge cases we miss in our testing. The way we handle our javascript alert yes no JavaScript exceptions is to: catch the exception. collect data about the useragent, context etc. Save it to our logs by sending an ajax request with

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the data and the exception information. I can finally log JS Exceptions! We decided to use window.onerror which is a DOM event handler that acts like a global try..catch. This is great for catching unexpected exceptions i.e. the ones that http://www.w3schools.com/js/js_popup.asp never occur while testing. It is very simple to get started with, you just have to override the handler like this: window.onerror = function (errorMsg, url, lineNumber) { alert('Error: ' + errorMsg + ' Script: ' + url + ' Line: ' + lineNumber); } But It Was Too Good To Be True If you test this on a local server (say IIS or nginx) then it should work fine. But it is not the same as a normal try..catch, so producing https://danlimerick.wordpress.com/2014/01/18/how-to-catch-javascript-errors-with-window-onerror-even-on-chrome-and-firefox/ a stacktrace with a library like stacktrace.js will probably not work too well. The window.onerror handler does not have the same context and the context varies enormously from browser to browser. Also, if you have minified your files then line number is not very useful. For example: Error: ‘a’ is undefined Script: build.js Line: 3 Variable ‘a' is very hard to find when line 3 has 30000 characters of minified JavaScript. Unfortunately, I do not have a solution for this for all browsers. This will get better over the next few months as a new standard for window.onerror has been agreed upon. It is already implemented for Chrome. The new standard adds two parameters; column number and an error object.  Our window.onerror handler now looks like this: window.onerror = function (errorMsg, url, lineNumber, column, errorObj) { alert('Error: ' + errorMsg + ' Script: ' + url + ' Line: ' + lineNumber + ' Column: ' + column + ' StackTrace: ' + errorObj); } I made a little test project to see what level of support there is. It contains one test page with a button and two script files. The button triggers a function in one script file that creates an exception and the other script file contains the window.onerror handler. As of 2014-01-18 the results were: Firefox 26.0 returns the first three parameters (hopefully this will be implemented soon) Internet Explorer 10 will return a column number but no error object. How

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this http://stackoverflow.com/questions/951791/javascript-global-error-handling site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x http://www.javascriptkit.com/javatutors/error2.shtml Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Javascript global javascript popup error handling up vote 232 down vote favorite 101 I would like to catch every undefined function error thrown. Is there a global error handling facility in Javascript? The use case is catching function calls from flash that are not defined. javascript javascript-events share|improve this question asked Jun 4 '09 at 16:53 Bob What do you want to do with an error javascript error window once you catch it? Do you just need to log it so you can create the missing function, or are you looking to stop exceptions from breaking your code? –Dan Herbert Jun 4 '09 at 17:00 2 I would like to get the name of the missing function called and based on presence of some string call my own function. Any call to a function with the string 'close' would call my close() for example. I would also like to trap the error at that point. –Bob Jun 4 '09 at 17:06 1 exceptionsjs.com provides this functionality and can be taylored to only catch errors related to undefined functionality with its "guard" functionality. –Steven Wexler Aug 4 '14 at 2:48 add a comment| 9 Answers 9 active oldest votes up vote 128 down vote accepted Does this help you: I'm not sure how it handles Flash errors though... Update: it doesn't work in Opera, but I'm hacking Dragonfly right now to see what it gets. Suggestion about hacking Dragonfly came from this question: http://stackoverflow.com/questions/645840/mimic-window-onerror-in-opera-using-javascript share|improve this answer e

using the onerror event), we can suppress them. Simply have your function attached to the onerror event return true at the very end. The following modifies the example on the last page so the default error message is suppressed: Defining the onerror event with a function that returns a value of true at the very top of your page suppresses all scripting errors on the page . Be careful when using the onerror event this way, since it only suppresses errors, but doesn't fix them. Even humans have trouble with the later! Whenever testing codes in your browser, make sure to first turn off the error suppressor , or you may even be fooled by your foul scripts! Tutorial introduction Using the onerror event to suppress JavaScript errors Getting additional details on an error Creating custom JavaScript error dialog boxes Getting additional details on an error JavaScript Kit Free JavaScripts JavaScript tutorials JavaScript Reference DOM Reference DHTML & CSS Web Design Free Java Applets CSS Quick Reference JavaScript Forums Partners CSS Drive JavaScript Menus CSS codes & examples iPage Review Facebook Fan Page View/ Post a Comment! Comments- Your Turn! Please enable JavaScript to view the comments powered by Disqus. Copyright (c) 1997-2016 JavaScript Kit. NO PART may be reproduced without author's permission.