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Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community error message javascript void 0 of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up javascript: how to display script errors in a popup alert? up vote 17 down vote favorite 6 http://www.w3schools.com/js/js_errors.asp I want to display script errors in a popup alert instead of showing them in the browser console. window.onerror = function() { var message = /* get error messages and put them here */; alert(message); return true; }; javascript error-handling share|improve this question edited Apr 9 '10 at 3:56 DVK 80.8k19155255 asked Apr 9 '10 at 3:44 powerboy 2,87394075 2 Note that the onerror event is only supported by IE http://stackoverflow.com/questions/2604976/javascript-how-to-display-script-errors-in-a-popup-alert and Mozilla. –CMS Apr 9 '10 at 4:01 1 So is there a cross-browser solution? I mean, a similar function supported by webkit –powerboy Apr 9 '10 at 4:05 1 You mean there are browsers other than IE and Mozilla??? Dang! I need to get out more :) –DVK Apr 9 '10 at 4:10 Actually it'll be supported (hopefully soon) in WebKit - see phwinfo.com/forum/comp-lang-javascript/… –DVK Apr 9 '10 at 4:12 yep! But I got another problem. Seems that onerror only support those 3 parameters. There is no way to catch an error of a specific name. –powerboy Apr 9 '10 at 4:30 | show 1 more comment 4 Answers 4 active oldest votes up vote 27 down vote accepted Yes, that is the correct way. See the reference here: http://www.javascriptkit.com/javatutors/error2.shtml And explanation of how to see more details of the error here: http://www.javascriptkit.com/javatutors/error3.shtml Their example: window.onerror = function(msg, url, linenumber) { alert('Error message: '+msg+'\nURL: '+url+'\nLine Number: '+linenumber); return true; } If you wish to display a LIST of errors in a single pop-up, it's trickier. Since the errors occue 1 by 1, you need to do the following: have window.onerror handler store error details in some array Check that array periodically - either via a timer
Syntax Javascript - Enabling Javascript - Placement Javascript - Variables Javascript - Operators Javascript - If...Else Javascript - Switch Case Javascript - While Loop Javascript - For Loop Javascript - For...in Javascript - http://www.tutorialspoint.com/javascript/javascript_error_handling.htm Loop Control Javascript - Functions Javascript - Events Javascript - Cookies Javascript - Page Redirect Javascript - Dialog Boxes Javascript - Void Keyword Javascript - Page Printing JavaScript Objects Javascript - Objects Javascript - Number Javascript - Boolean Javascript - Strings Javascript - Arrays Javascript - Date Javascript - Math Javascript - RegExp Javascript - HTML DOM JavaScript Advanced Javascript - Error Handling Javascript error message - Validations Javascript - Animation Javascript - Multimedia Javascript - Debugging Javascript - Image Map Javascript - Browsers IMS DB Resources Javascript - Questions And Answers Javascript - Quick Guide Javascript - Functions Javascript - Resources Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer Glossary Who is Who JavaScript - Errors & Exceptions Handling Advertisements Previous Page message in javascript Next Page There are three types of errors in programming: (a) Syntax Errors, (b) Runtime Errors, and (c) Logical Errors. Syntax Errors Syntax errors, also called parsing errors, occur at compile time in traditional programming languages and at interpret time in JavaScript. For example, the following line causes a syntax error because it is missing a closing parenthesis. When a syntax error occurs in JavaScript, only the code contained within the same thread as the syntax error is affected and the rest of the code in other threads gets executed assuming nothing in them depends on the code containing the error. Runtime Errors Runtime errors, also called exceptions, occur during execution (after compilation/interpretation). For example, the following line causes a runtime error because here the syntax is correct, but at runtime, it is trying to call a method that does not exist. Exceptions also affect the thread in which they occur, allowing other JavaScript threads to continue normal execution. Logical Errors Logic errors can be the most difficult type of errors to track down. These errors are