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Javascript Error Handling Best Practices
other. Join them; it only takes a minute: Sign up Get all javascript errors on page/javascript error handling up vote 9 down vote favorite 9 I want to be able to send myself all the javascript errors on a page. I am an extension developer, so the following has an emphasis on making sure the dom is ready before javascript catch all errors making calls to it. I investigated adding some functionality to the throw to also send or mail the exceptions, but I didn't find this to be possible. 1:main solution to this, a window.onerror handler: window.onerror = function(e, url, line){ mailError('onerror: ' + e + ' URL:' + url + ' Line:' + line); console.error('\nLine ' + line + ':'); setTimeout(function(){retry();}, 100); //mainly useful in content scripts for extensions, return true; } May also need to do same thing via jQuery: $(window).error( function(e, url, line){ //handle error } ); The downfall of this is that your code has stopped executing. To avoid errors stopping execution, it's best to use callbacks to make sure code executes in a certain sequence, and to utilize events wherever possible. You can also protect dom calls with a few techniques $(document).ready({ //you usually won't get bad dom calls wrapping your code in this }); You can also consider running code on window.onload window.onload = function(){ //you page will probably twitch upon executing code at this time //but you will
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& Guides Learn the Web Tutorials References Developer Guides Accessibility Game https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/toString development ...more docs Mozilla Docs Add-ons Firefox WebExtensions Developer ToolsFeedback Get Firefox help Get web development help Join the MDN community Report a content http://getfirebug.com/errors problem Report a bug Search Search Languages Català (ca) Deutsch (de) Français (fr) 日本語 (ja) Русский (ru) 中文 (简体) (zh-CN) Add a translation javascript error Edit Advanced Advanced History Print this article MDN Web technology For developers JavaScript JavaScript reference Standard built-in objects Error Error.prototype.toString() Your Search Results eduardoboucas fscholz Mingun Waldo getify Sheppy ethertank evilpie Sevenspade Error.prototype.toString() In This Article SyntaxReturn valueDescriptionExamplesSpecificationsBrowser compatibilitySee also The toString() method returns a string representing the specified javascript error message Error object. Syntax e.toString() Return value A string representing the specified Error object. Description The Error object overrides the Object.prototype.toString() method inherited by all objects. Its semantics are as follows (assuming Object and String have their original values): Error.prototype.toString = function() { 'use strict'; var obj = Object(this); if (obj !== this) { throw new TypeError(); } var name = this.name; name = (name === undefined) ? 'Error' : String(name); var msg = this.message; msg = (msg === undefined) ? '' : String(msg); if (name === '') { return msg; } if (msg === '') { return name; } return name + ': ' + msg; }; Examples var e = new Error('fatal error'); console.log(e.toString()); // 'Error: fatal error' e.name = undefined; console.log(e.toString()); // 'Error: fatal error' e.name = ''; console.log(e.toString()); // 'fatal error' e.message = undefined; console.log(e.toString()); // 'Error' e.name = 'hello'; co
Source Firebug Lite Extensions Firebug and Errors When things go wrong, Firebug lets you know immediately and gives you detailed and useful information about the errors in JavaScript, CSS, and XML. Firebug Start Button On the right side of the Firefox browser's tool bar you will see a little Firebug icon. This is Firebug's entry point (aka Start button). It can be used to open the Firebug UI, access basic commands or see whether there are any JavaScript errors on the page. No error soup Most browsers report errors by dumping them all into one big window that includes the problems with every web page you've ever visited. Firebug is kinder than that; it shows you only the errors for the page that you're looking at. Informative JavaScript errors JavaScript errors include a wealth of information about what went wrong, including a description, the file and line number, and the line of source code that caused the error. Even more importantly, if you click the arrow to expand the description you will see a complete stack trace including the values of all function arguments. Jump to the debugger Every error report has a link on its right side that points to the file and line number where the error occurred. Clicking this link will take you right to the Firebug JavaScript debugger or CSS inspector so that you can get started on solving the problem right away. Some errors also include the actual snippet of source that contains the error, which is also a link to the original file. Quick search Using the quick search box, you can filter the Firebug Console to show only the errors and messages that match the text that you searched for. As new rows are added to the console, they will only appear if they match the text in the quick search box. Filtering errors Firebug is capable of reporting errors in JavaScript, CSS, or XML files. If you only care about some of these languages, uncheck the ones you don't want to see in the Console's options menu. Error Position In case of JavaScript errors the Console panel shows an arrow to the exact position insid