Javascript Try Catch Error Object Line Number
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Javascript Get Line Number
4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up try-catch in JavaScript : how to get stack trace nodejs try catch line number or line number of the original error up vote 6 down vote favorite When using TRY-CATCH in JavaScript, how to get the line number of the line that caused the error? On many browsers, the below code will work great and I will get the javascript error object stack trace that points to the actual line that throw the exception. However, some browsers do not have "e.stack". IPhone's safari is one example. Is there someway to get the line number that will work for all browsers? try { // lots of code here var i = v.WillGenerateError; // how to get this line number in catch?? // lots of code here } catch (e) { alert (e.stack) // this will work on chrome, FF. will no not work on safari alert (e.line) // this will work on safari but
Node Error Line Number
not on IPhone } Many thanks! UPDATE: I found that e.line works on safari but still not available on IPhone, latest iOS version javascript ios mobile share|improve this question edited Jun 12 '12 at 15:10 asked Jun 11 '12 at 22:04 Greg Bala 539823 1 Why not just remove the try...catch and look at what line the standard error message points to? –robertc Jun 11 '12 at 22:10 1 @robertc I need the try...catch for other reasons. For example, I would like to capture the state when the error occurred –Greg Bala Jun 11 '12 at 22:13 Are you getting that on the iPhone at the moment? You're looking for more information in order to track down an error, there is a way to get more information than you have at the moment, why do you not want to take advantage of it? –robertc Jun 11 '12 at 22:16 @robertc For example - I would like to capture caurrent values in all function variables exactly when the error occurred. As far as I know, i can only do this in catch. I know that I can omit try ... catch all together, and use window.onerror to give me the line number but this is not enough AND it also is not available in all browsers –Greg Bala Jun 11 '12 at 22:20 Then after you're found the line number, put the catch back... –robertc Jun 11 '12 at 22:21 | show 2 more comments 3 Answers 3 active oldest votes up vote 2 down vote Try to use e.lineNumber. For example
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Javascript Get Calling Function
Català (ca) Deutsch (de) Español (es) Français (fr) Bahasa Indonesia (id) 日本語 (ja) 한국어 (ko) Polski (pl) Português (do Brasil) (pt-BR) Русский (ru) 中文 (简体) (zh-CN) 正體中文 http://stackoverflow.com/questions/10988169/try-catch-in-javascript-how-to-get-stack-trace-or-line-number-of-the-original (繁體) (zh-TW) Add a translation Edit Advanced Advanced History Print this article MDN Web technology For developers JavaScript JavaScript reference Standard built-in objects Error Your Search Results ariyankhan josephmcasey AlexanderFradiani fscholz mondwan SphinxKnight janosch-x davidchase Mingun shawnacscott Sheppy ethertank Nickolay evilpie trevorh teoli davidbourguignon secoif DomenicDenicola dgchurchill timemachine3030 Sevenspade Potappo Sephr Brettz9 Mgjbot https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error Allanbonadio Ptak82 JustinLudwig Error In This Article SyntaxParametersDescriptionError typesPropertiesMethodsError instancesPropertiesStandard propertiesVendor-specific extensionsMicrosoftMozillaMethodsExamplesThrowing a generic errorHandling a specific errorCustom Error TypesSpecificationsBrowser compatibilitySee also The Error constructor creates an error object. Instances of Error objects are thrown when runtime errors occur. The Error object can also be used as a base object for user-defined exceptions. See below for standard built-in error types. Syntax new Error([message[, fileName[, lineNumber]]]) Parameters message Optional. Human-readable description of the error. fileName Optional. The value for the fileName property on the created Error object. Defaults to the name of the file containing the code that called the Error() constructor. lineNumber Optional. The value for the lineNumber property on the created Error object. Defaults to the line number containing the Error() constructor invocation. Description Runtime errors result in new Error objects being created and thrown. This page documents the use of the Error object itself and its use as a constructor function. For a list of properties and
need to throw an exception and get the line number and the call stack in JavaScript, specially when we http://www.jomendez.com/2015/02/25/throw-error-line-number-javascript/ are developing a feature that will be used by other developers. Since JavaScript have far less tools to aid in debugging than other languages, when we are building https://blog.sentry.io/2016/01/04/client-javascript-reporting-window-onerror.html a functionality it is handy to throw an exception when the developer that is using you code need to meet certain requirements. For example: function someFunction(callback){ if(typeof line number callback != ‘function’){ // throw an exception here }else{ callback(); } } With this code we can achieve it: var err; try { throw new Error('myError'); } catch (e) { err = e; } if (!!err) console.log(err.stack); if you put this code in the console (chrome) this is the result: Error: myError at :4:11 at Object.InjectedScript._evaluateOn javascript try catch (:777:140) at Object.InjectedScript._evaluateAndWrap (:710:34) at Object.InjectedScript.evaluate (:626:21) This is the code wrapped in a function to enable re-utilization: Compatibility by Mozilla Descktop compatibility: Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari Basic support (Yes) (Yes) 10 (Yes) 6 Mobile compatibility: Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Basic support Android 4 (perhaps Android 3, but not Android 2) ? ? ? ? 6 Leave a comment Post navigation « Optimizing code using Object.defineProperty instead of $scope for $watch in AngularJs What’s coming in EcmaScript 6 Part 1 » Leave a Reply Cancel reply Your email address will not be published. Required fields are marked * Name * Email * Website + = 8 Comment Yes, add me to your mailing list. Subscribe to our Newsletter Enter your email address to subscribe to my blog and receive notifications of new posts by email. Search Categories AngularJS ASP.NET Best-Practices C# Interview-Questions JavaScript Microsoft Certification Exam mini-challenges Protractor Recent Posts
to log client-side errors and report them to your servers. It’s also one of the major mechanisms by which Sentry’s client JavaScript integration (raven-js) works. You listen to the onerror event by assigning a function to window.onerror: window.onerror = function (msg, url, lineNo, columnNo, error) { // ... handle error ... return false; } When an error is thrown, the following arguments are passed to the function: msg – The message associated with the error, e.g. “Uncaught ReferenceError: foo is not defined” url – The URL of the script or document associated with the error, e.g. “/dist/app.js” lineNo – The line number (if available) columnNo – The column number (if available) error – The Error object associated with this error (if available) The first four arguments tell you in which script, line, and column the error occurred. The final argument, Error object, is perhaps the most valuable. Let’s learn why. The Error object and error.stack At first glance the Error object isn’t very special. It contains 3 standardized properties: message, fileName, and lineNumber. Redundant values that already provided to you via window.onerror. The valuable part is a non-standard property: Error.prototype.stack. This stack property tells you at what source location each frame of the program was when the error occurred. The stack trace can be a critical part of debugging an error. And despite being non-standard, this property is available in every modern browser. Here’s an example of the Error object’s stack property in Chrome 46: "Error: foobar\n at new bar (