Does IE9 support console log and is it a real function

Question

In which circumstances is window console log defined in Internet Explorer 9   Even when window console log is defined  window console log apply and window console log call are undefined  Why is this    Related question for IE8  What happened to console log in IE8

User · Answer

I know this is a very old question but feel this adds a valuable alternative of how to deal with the console issue. Place the following code before any call to console.* (so your very first script).

// Avoid `console` errors in browsers that lack a console.
(function() {
    var method;
    var noop = function () {};
    var methods = [
        'assert', 'clear', 'count', 'debug', 'dir', 'dirxml', 'error',
        'exception', 'group', 'groupCollapsed', 'groupEnd', 'info', 'log',
        'markTimeline', 'profile', 'profileEnd', 'table', 'time', 'timeEnd',
        'timeStamp', 'trace', 'warn'
    ];
    var length = methods.length;
    var console = (window.console = window.console || {});

    while (length--) {
        method = methods[length];

        // Only stub undefined methods.
        if (!console[method]) {
            console[method] = noop;
        }
    }
}());

Reference:
https://github.com/h5bp/html5-boilerplate/blob/v5.0.0/dist/js/plugins.js

User · Answer

console log is only defined when the console is open  If you want to check for it in your code make sure you check for for it within the window property   if  window console      console log msg    this throws an exception in IE9 and will not work correctly  Do not do this  if  console       console log msg

User · Answer

I would like to mention that IE9 does not raise the error if you use console log with developer tools closed on all versions of Windows  On XP it does  but on Windows 7 it doesn t  So if you dropped support for WinXP in general  you re fine using console log directly

User · Answer

In Internet Explorer 9  and 8   the console object is only exposed when the developer tools are opened for a particular tab   If you hide the developer tools window for that tab  the console object remains exposed for each page you navigate to   If you open a new tab  you must also open the developer tools for that tab in order for the console object to be exposed   The console object is not part of any standard and is an extension to the Document Object Model   Like other DOM objects  it is considered a host object and is not required to inherit from Object  nor its methods from Function  like native ECMAScript functions and objects do   This is the reason apply and call are undefined on those methods   In IE 9  most DOM objects were improved to inherit from native ECMAScript types   As the developer tools are considered an extension to IE  albeit  a built-in extension   they clearly didn t receive the same improvements as the rest of the DOM    For what it s worth  you can still use some Function prototype methods on console methods with a little bind   magic   var log   Function prototype bind call console log  console   log apply console    this    is    a    test       - gt   thisisatest

User · Answer

How about     console     log   function text    alert text

User · Answer

A simple solution to this console log problem is to define the following at the beginning of your JS code   if   window console  window console       if   window console log  window console log   function           This works for me in all browsers  This creates a dummy function for console log when the debugger is not active  When the debugger is active  the method console log is defined and executes normally

User · Answer

After reading the article from Marc Cliament s comment above  I ve now changed my all-purpose cross-browser console log function to look like this   function log          use strict        if  typeof console       undefined   amp  amp  console log     undefined                try                       console log apply console  arguments                     catch  e                        var log   Function prototype bind call console log  console               log apply console  arguments

[javascript] Does IE9 support console.log, and is it a real function?

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