On Error Handler Javascript
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References & Guides Learning web development Tutorials References Developer Guides Accessibility Game development ...more docs Mozilla Docs Add-ons Firefox Developer ToolsFeedback Get Firefox help Get web development help Join the MDN community Report a content problem Report a bug Search Search Languages Español (es) Français (fr) Português (do Brasil) (pt-BR) Русский (ru) 中文 (简体) (zh-CN) Add a translation Edit Advanced Advanced History Print this article MDN Web technology For developers Web APIs GlobalEventHandlers GlobalEventHandlers.onerror Your Search Results Brettz9 LeonardoBraga RonRoyston Nickolay oldhill cvrebert Sebastianz robatron http://www.w3schools.com/js/js_errors.asp teoli MHasan diegocr Delapouite kscarfone Sheppy Nux SergeG Doekman Rappo GlobalEventHandlers.onerror In This Article Syntaxwindow.onerrorelement.onerror (and window.addEventListener('error'))NotesSpecificationsBrowser compatibilitySee also An event handler for the error event. Error events are fired at various targets for different kinds of errors: When a JavaScript runtime error (including syntax errors and exceptions thrown within handlers) occurs, an error event using interface ErrorEvent is fired at https://developer.mozilla.org/en-US/docs/Web/API/GlobalEventHandlers/onerror window and window.onerror() is invoked (as well as handlers attached by window.addEventListener (not only capturing). When a resource (such as an or script) fails to load, an error event using interface Event is fired at the element, that initiated the load, and the onerror() handler on the element is invoked. These error events do not bubble up to window, but (at least in Firefox) can be handled with a single capturing window.addEventListener. Installing a global error event handler is useful for automated collection of error reports. Syntax For historical reasons, different arguments are passed to window.onerror and element.onerror handlers (as well as on error-type window.addEventListener handlers). window.onerror window.onerror = function(messageOrEvent, source, lineno, colno, error) { ... } Function parameters: message: error message (string or event object). Available as event (sic!) in HTML onerror="" handler and also as an event object when dispatching an Event to window in which case the other arguments will not be supplied (as opposed to ErrorEvent which does cause the full range of arguments to be supplied to window.onerror whereas the single error event object is supplied to window.addEventListener('error') handlers) . sour
References & Guides Learning web development Tutorials References https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Control_flow_and_error_handling Developer Guides Accessibility Game development ...more docs Mozilla Docs http://stackoverflow.com/questions/951791/javascript-global-error-handling Add-ons Firefox Developer ToolsFeedback Get Firefox help Get web development help Join the MDN community Report a content problem Report a bug Search Search Languages বাংলা (বাংলাদেশ) (bn-BD) Deutsch (de) Español (es) Français (fr) on error Bahasa Indonesia (id) Italiano (it) 日本語 (ja) 한국어 (ko) မြန်မာဘာသာ (my) Nederlands (nl) Polski (pl) Português (do Brasil) (pt-BR) Русский (ru) ไทย (th) Türkçe (tr) 中文 (简体) (zh-CN) 正體中文 (繁體) (zh-TW) Add a translation Edit Advanced Advanced History Print this article MDN Web technology For developers on error handler JavaScript JavaScript Guide Control flow and error handling Your Search Results fscholz DineshMv haarabi gauravkakkar zackharley Fornost461 Vipul-Tehri RGhadamian SauravTyagi jswisher gitwillsky mickbeaver Jamesadamar jsx yuxuac x2357 nasifmdtanjim gportioli xfq SphinxKnight Sheppy themitchy acamposg71 olso heyitsmarcucu Silwing pablofiumara MustafaAlawadi ethertank iskitz smaudet MDNion teoli lmorchard Ms2ger ThomasR timemachine3030 user01 elliottcable Nickolay JesseW Control flow and error handling In This Article Block statementExampleConditional statementsif...else statementFalsy valuesExampleswitch statementExampleException handling statementsException typesthrow statementtry...catch statementThe catch blockThe finally blockNesting try...catch statementsUtilizing Error objectsPromisesLoading an image with XHR « PreviousNext » JavaScript supports a compact set of statements, specifically control flow statements, that you can use to incorporate a great deal of interactivity in your application. This chapter provides an overview of these statements. The JavaScript reference contains exhaustive details about the statements in this chapter. The s
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 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 Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Javascript global 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 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 Drag