Console Is Undefined Javascript Error
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Console Is Undefined Error Message
more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags microsoft jscript runtime error console is undefined Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, sys is undefined javascript error helping each other. Join them; it only takes a minute: Sign up Internet Explorer: “console is not defined” Error up vote 19 down vote favorite 4 I was using console.log() in some JavaScript I wrote and an error
Console Is Undefined In Ie9
of: console is not defined was thrown in Internet Explorer (worked fine in other browsers). I have replaced it with: if (console) console.log("..."); If console is undefined, I would expect the condition to evaluate as false. Ergo, the statement console.log wouldn't be executed and shouldn't throw an error. Instead, an error of: console is not defined at character 4 is thrown. Is this a IE bug? Or is that "if" condition really illegal? It seems absurd because
Console Is Undefined Ie8
if if (console) is illegal, then if (console==undefined) should be illegal too. How are you supposed to check for undefined variables? javascript internet-explorer internet-explorer-8 console undefined share|improve this question edited Nov 27 '13 at 11:48 Rohwedder 5043923 asked Mar 15 '12 at 17:36 matteo 89642141 13 console doesn't exist in IE unless the console is actually open. –Dagg Nabbit Mar 15 '12 at 17:38 BTW you may have some another console object, hence foolproof solution would be to check that console.log exists and is a function. –kirilloid Mar 15 '12 at 17:41 2 possible duplicate of 'console' is undefined error for internet explorer –Dagg Nabbit Mar 15 '12 at 17:41 2 Did I really write "Ergo"??? Or is that what @Matt McDonald edited? –matteo Apr 24 '12 at 21:41 Ergo was added by last editor "user1385191" :) –JOM May 14 '13 at 9:55 add a comment| 8 Answers 8 active oldest votes up vote 24 down vote accepted If console itself doesn't exist at all, it throws an error because you're accessing an undefined variable. Just like if(abc) {} throws an error. Since console resides in window, and window does always exist, this should work: if(window.console) ... Basically, accessing an property that doesn't exist is free and doesn't throw an error (it just evaluates to undefined, failing the if con
connections all over the world. Join today Download & Extend Drupal Core Distributions Modules Themes Media ColorboxIssues IE 8 throws "console is undefined" console is undefined ie 10 error, breaking all other javascript on the page Needs workProject:Media ColorboxVersion:7.x-1.x-devComponent:CodePriority:CriticalCategory:Bug
Console Is Undefined Internet Explorer
reportAssigned:UnassignedReporter:dianacastilloCreated:October 29, 2013 - 19:20Updated:April 10, 2015 - 13:34 Log in or register to update this issue Jump console is undefined fix to:Most recent comment Most recent attachment this module causes a "'console' is undefined" error in mediacolorbox.js when using IE 8 . Has anyone run across this problem?Files: CommentFileSizeAuthor #2 http://stackoverflow.com/questions/9725111/internet-explorer-console-is-not-defined-error media_colorbox-fix_console_undefined.patch489 bytescoredumperror Comments Comment #1 coredumperror CreditAttribution: coredumperror commented October 29, 2013 at 10:34pm I'm currently working on tracking this down as well, because it completely breaks my site for users on IE8. It appears to be related to media_colorbox.js being loaded without jquery.colorbox-min.js also being loaded. Log in or register to post comments Comment #2 coredumperror CreditAttribution: coredumperror https://www.drupal.org/node/2123327 commented October 29, 2013 at 11:05pm Title: IE 8 causes 'console' is undefined » IE 8 throws "console is undefined" error, breaking all other javascript on the page Version: 7.x-1.0-rc4 » 7.x-1.x-dev Priority: Normal » Critical Status: Active » Needs review FileSize media_colorbox-fix_console_undefined.patch489 bytes OK, here's a patch that fixes this problem. It changes the media_colorbox.js file to only call console.log() if the console object actually exists. The attached patch is just a quick and dirty fix. The real fix for this is to take the "scripts[] = media_colorbox.js" line out of media_colorbox.info, and instead call drupal_add_js() to add the media_colorbox.js file only where it's needed. The problem arises because media_colorbox.js currently gets added to every page, but jquery.colorbox.js doesn't, which is what's triggering the call to console.log(). I'd do this step myself, but I don't know which functions would need to have that drupal_add_js() line. I'm also bumping this issue to critical, because IE8's braindead javascript engine kills all JS execution as soon as it encounters an error. Thus, this problem breaks every o
("x is not defined") and how best to code against them can be frustrating. This is my attempt to straighten things out a little. If you're not already https://javascriptweblog.wordpress.com/2010/08/16/understanding-undefined-and-preventing-referenceerrors/ familiar with the difference between variables and properties in JavaScript (including the internal VariableObject) now might be a good time to check out my previous posting. What is http://programmers.stackexchange.com/questions/207801/what-does-ie-mean-by-saying-console-is-undefined undefined? In JavaScript there is Undefined (type), undefined (value) and undefined (variable). Undefined (type) is a built-in JavaScript type. undefined (value) is a primitive and is the sole value is undefined of the Undefined type. Any property that has not been assigned a value, assumes the undefined value. (ECMA 4.3.9 and 4.3.10). A function without a return statement, or a function with an empty return statement returns undefined. The value of an unsupplied function argument is undefined. var a; typeof a; //"undefined" window.b; typeof window.b; //"undefined" var c console is undefined = (function() {})(); typeof c; //"undefined" var d = (function(e) {return e})(); typeof d; //"undefined" undefined (variable) is a global property whose initial value is undefined (value), Since its a global property we can also access it as a variable. For consistency I'm always going to call it a variable in this article. typeof undefined; //"undefined" var f = 2; f = undefined; //re-assigning to undefined (variable) typeof f; //"undefined" As of ECMA 3, its value can be reassigned : undefined = "washing machine"; //assign a string to undefined (variable) typeof undefined //"string" f = undefined; typeof f; //"string" f; //"washing machine" Needless to say, re-assigning values to the undefined variable is very bad practice, and in fact its not allowed by ECMA 5 (though amongst the current set of full browser releases, only Safari enforces this). And then there's null? Yes, generally well understood but worth re-stating: undefined is distinct from null which is also a primitive value representing the intentional absence of a value. The only similarit
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 Programmers Questions Tags Users Badges Unanswered Ask Question _ Programmers Stack Exchange is a question and answer site for professional programmers interested in conceptual questions about software development. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top What does IE mean by saying “'console' is undefined”? [closed] up vote -1 down vote favorite I like IE's persnicketiness (the debugging tools that take you right to your code is even more user-friendly than what I've found in F12 Chrome Dev Tools), but why does it say, "'console' is undefined" re: this line of jQjuery: console.log("entered submit button click"); How could console be undefined? Neither Chrome nor Firefox complain about it... And ironically, IE shows me this error message where? In the "Console" tab! Shirley it couldn't be case-sensitive, and it expects "Console.log"? BTW and anyway, I'm impressed with IE's F12 tools; I wonder if it's "The Avis Effect" at work - they were #5 (among Browsers) and have thus begun fighting like a rabid wolverine to claw and scratch their way upwards? web-development development-process browser share|improve this question asked Aug 9 '13 at 21:24 B. Clay Shannon 212420 closed as off-topic by GrandmasterB, psr, MichaelT, Corbin March, gnat Aug 10 '13 at 12:02 This question does not appear to be about software development within the scope defined in the help center.If this question can be reworded to fit the rules in the help center, please edit the question. 4 IE does not automatically create a console object. The debugging tools need to be open (or have been open) before the object is created. This little gotcha has caught many developers over the years. To get around it, make a wrapper function that checks for the validity of the console object before writing to it, or create a dummy console object that contains the methods you use. But, t