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Error Console

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Revision as of 10:34, 16 January 2005; view current revision
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This page is part of the extension development documentation project.

Ask your questions in MozillaZine Forums. Also try browsing example code.

Note: development documentation is in process of being moved to Mozilla Development Center (MDC).

You can print information to JavaScript Console using the following method:

  1. Declare a variable (global if you're scripting your own window or your object's member if you're overlaying an existing window):
    var gConsoleService = Components.classes['@mozilla.org/consoleservice;1']
                        .getService(Components.interfaces.nsIConsoleService);

    (note, that you can use toJavaScriptConsole() function to open JavaScript console on startup)

  2. Define a function:
    function myExt_logMessage(aMessage) {
      gConsoleService.logStringMessage('My extension: ' + aMessage);
    }
  3. Use it like here:
    myExt_logMessage("Initialized.");

See also: Viewing dump() output, Using Console service.