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firefox log message to error console Medicine Lodge, Kansas

Did you try to grant the capability in user_pref as demonstrated in a comment in the code? –MarcH Aug 4 '11 at 10:15 Where exactly is the error thrown? To enable it, go to about:config in the url bar and set to true, or set the "Enable chrome and add-on debugging" option in the developer tool settings. All rights reserved. Components.utils.import("resource://gre/modules/Console.jsm"); console.log("Hello from Firefox code"); //output messages to the console Learn more: console API reference Console.jsm source code in the Mozilla DXR HUDService There is also the HUDService which allows access

To see anything, you need to set the pref browser.dom.window.dump.enabled to true, e.g. Under Microsoft Windows you additionally need to start Firefox via the following command to have a native console : firefox.exe -console Using normal JavaScript object inspection, you can write a function Declaration dropped. [firefox #2] LOG LEVEL: WARNING Unknown property 'user-select'. Activate it through with the menu Tools > Web Developer > Browser Console.

Like this: if (typeof console != "undefined") { console.log( "key press, char code " + e.charCode + ", key code " + e.keyCode + ", " + e.ctrlKey + ", " try {'UniversalXPConnect'); } catch (e) { // User has denied privileges // alert( + ": " + e.message); return; } ffconsoleService = Components.classes[";1"] .getService(Components.interfaces.nsIConsoleService); mylog = function (msg) {'UniversalXPConnect'); If the result of a command is an object, you can click on the object to see its details. Logging object hyperlinks console.log and its related functions can do a lot more than just write text to the console.

Color coding In addition to console.log, there are several other functions you can call to print messages with a colorful visual and semantic distinction. The catch? Object inspection How many times have you hand-written code to dump all of the properties of an object, or all of the elements in an HTML fragment? We see we can not only access the Browser Console but also Web Console.

Declaration dropped. [firefox #2] LOG LEVEL: WARNING Expected media feature name but found '-webkit-min-device-pixel-ratio'. ­čĹŹ 3 jleyba commented Oct 15, 2015 The FirefoxDriver is not configured to capture JS console No worries since you are the one developing it, right? // Define mylog() function to log to Firefox' error console if such a // thing exists function defineMyLog() { // Provide Strict code checking If you set the pref javascript.options.strict to true, the JavaScript engine gives you more types of warnings on the Error Console, most of which hint at code bugs You may also use the %c pattern to use the second argument as a style formatting parameter.

You can pass any kind of object to console.log and it will be displayed as a hyperlink. Firefox does not show anything different for debug - according to MDN it has been deprecated in Firefox in favour of console.log() Chrome and Safari (nightly) will not show an icon Dec 15 '09 at 20:09 2 bazquux is EXACTLY the type of error I wanted to notify myself about –bobobobo Jan 18 '10 at 4:30 add a comment| up vote But while the Web Console executes code in the page window scope, the Browser Console executes them in the scope of the browser's chrome window.

But if you are interested in how extensions in firefox interact with the error console. These include console.debug,, console.warn, and console.error. With Firebug, you'll never write that code again. Log.jsm (formerly log4moz) This is a partial implementation of the Log4* interfaces (for example, see log4j or log4net).

It's hard to get users to change things like that. –jmort253 Aug 6 '11 at 16:18 1 Even with Firefox 3 this function required to grant full privileges to the Links and Elsewhere What is Firebug? String formatting console.log can format strings in the great tradition of printf. What does a well diversified self-managed investment portfolio look like?

share|improve this answer answered Apr 23 '09 at 22:02 Ben Blank 29.1k1391139 Interesting, I'll keep that in mind. –Torsten Marek Apr 23 '09 at 22:06 And in One exported symbol from Console.jsm is "console". Just assign it to a debug function: var debug = function () {} ; if (window.console != undefined) { debug = console.log; }. console.log() will work printf style.

See here:… –ceving May 29 '12 at 13:06 add a comment| up vote 33 down vote yes you can =P function log(param){ setTimeout(function(){ throw new Error("Debug: "+param) },0) } //Simple Now you can also do this: debug ("%s", "a") –ceving Dec 5 '11 at 16:35 1 @ceving: do you know why with your solution in chrome I get: TypeError: Illegal On Windows, the following code will add a new item to the browser's main menu: var parent = window.document.getElementById("appmenuPrimaryPane"); var makeTheTea = gBrowser.ownerDocument.defaultView.document.createElementNS("", "menuitem"); makeTheTea.setAttribute("label", "A nice cup of tea?"); parent.appendChild(makeTheTea); Throwing an error explictly wasn't an option, because I was tracing my code. –Torsten Marek Apr 23 '09 at 22:05 2 If you want a non-blocking error message (e.g., monitoring

Board index All times are UTC - 8 hours [ DST ] Login FAQ / Rules Register Search Boards : Knowledge Base: knowledge base chat about fr ja es mozillaZine is I know that I there's Firebug, which provides a console object and its own error console, but I was looking for a quick fix earlier on and couldn't find anything. You signed in with another tab or window. This doesn't affect FireBug, as all console.log(...) results immediately appear in its console regardless of the pref. –Bass Feb 11 at 15:15 add a comment| up vote 46 down vote If

In debug builds this also dumps a stack trace to the console, even when the debugger is not running. However, it displays such messages from: web content hosted by all browser tabs the browser's own code add-ons. For example: console.log('Kings: ', kings);. Introduction and Features Documentation FAQ and Wiki CommunityDiscussion forums and lists Get InvolvedHack the code, create extensions Firebug Web Development Evolved.

Similarly, you can execute JavaScript expressions using the Browser Console. For example, you can write console.log("%s is %d years old.", "Bob", 42). You can also start the Browser Console by launching Firefox from the command line and passing the -jsconsole argument: /Applications/ -jsconsole The Browser Console looks like this: You can see that To get the console working, I had to Disable the console Re-enable it Shift-reload the page being debugged My friend also said that if she didn't enable the console in Firebug,

It should give pointers to tools, aids and tricks which make debugging your code easier. The Web Console is in flux (see, you may need to change settings named devtools.* in about:config , YMMV. Firebug will then log the time that was spent in between. With a test like: describe("protractor/webdriver", function() { it("should be able to get browser logs", function() { browser.get(""); browser.executeScript("console.log('Nothing to see here - move along.')"); browser.executeScript("console.warn('This is your first warning!')"); browser.executeScript("console.error('This is

Messages from add-ons The Browser Console displays messages logged by all Firefox add-ons. Just call console.profile() before the code you want to measure, and then console.profileEnd() afterwards. Firebug provides a set of handy assertion functions, and writes very informative error messages to the console when your assertions fail. Generate a 6 character string from a 15 character alphabet Can Communism become a stable economic strategy?

Browse other questions tagged javascript firefox debugging or ask your own question. Risk Management in Single engined piston aircraft flight Making sense of U.S. dump() The dump() function allows you to print text on the native console. Privacy Policy Legal Notices Secrets of the Browser Developer Tools secrets about contribute Back to Top Log, Info, Debug, Warn, Error Console ChromeFirebugFirefoxInternet explorerOperaSafari Favorite console.log() is an extremely useful tool

It's a script which you can include into any web page (even dynamically), which will give you some basic Firebug functionality (such as console.log()). Linked 117 TypeError: Illegal Invocation on console.log.apply 21 Log to Safari JavaScript Console 6 ignore firebug console when not installed Related 6553How do JavaScript closures work?357JavaScript: How do I print a You can use to output information messages; console.debug() to output debug messages; console.warn() to output warning messages and console.error() to output error messages.