Difference between revisions of "GM log"

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(deprecation warning)
(I want to scream.)
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'''This feature is deprecated.  Script authors are advised to use [https://developer.mozilla.org/en-US/docs/Web/API/console.log console logging] instead.'''
'''This feature is deprecated ({{GitTicket|1819}}).  Script authors are advised to use [https://developer.mozilla.org/en-US/docs/Web/API/console.log console logging] instead.'''
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== GM_log and Firebug ==
== GM_log and Firebug ==


Since [https://addons.mozilla.org/firefox/addon/1843 Firebug] 1.0, <code>extensions.firebug.showChromeMessages</code> must be set to <code>true</code> for GM_log messages to show up in the Firebug console.
GM_log does not work with Firebug's console anymore. Use <code>console.log</code> instead.
 
It is also recommended to enable <code>extensions.firebug.showChromeErrors</code>, as doing so will reveal syntax errors and script breaks.
This can be done from <code>about:config</code>, or from the Firebug GUI. Go to the "Console" tab, then click the arrow next to the tab's name, and ensure that "Show Chrome Errors" and "Show Chrome Messages" are checked.
 
However, since <code>GM_log</code> will only display a single string at a time, users with Firebug installed may prefer to use <code>console.log</code> instead.


[[Category:API_Reference|L]]
[[Category:API_Reference|L]]

Revision as of 01:01, 25 May 2014


This feature is deprecated (#1819). Script authors are advised to use console logging instead.

Description

This method provides a very simple logging facility. If you aren't seeing your messages, make sure you navigate to about:config, and change the values of javascript.options.showInConsole and javascript.options.strict to true.

The output is displayed in the error console, and includes the namespace and name of the script before and the provided string value. So, this script:

// ==UserScript==
// @name          GM_log Example
// @namespace     http://www.example.com/
// ==/UserScript==

GM_log("This is an example of GM_log");

Will produce a line in the error console like:

http://www.example.com/GM_log Example: This is an example of GM_log

Compatibility: Greasemonkey 0.3b+

Syntax

function GM_log( message )

Arguments

message
String (or any object with a .toString() method) The message to display in the console.

Returns

undefined

Examples

GM_log("Hello, World!");
GM_log("Warning, " + someInputField.value + "!");

GM_log and Firebug

GM_log does not work with Firebug's console anymore. Use console.log instead.