log4javascript - no trace messages appear

Question

I'm using log4javascript version 1.4.3.
In my app it works fine for all log levels except trace. To simplify things and make sure that the problem is not within my app I made an example using the authors sample code as an example and added a setThreshold(log4javascript.TRACE), then added a line to generate a trace entry (I also deleted the lines from his example that are relevant only to an ajaxAppender leaving just the popUpAppender).

When I run the code the error and debug messages appear in a log4javascript popUp window but no trace message.

Evidently I don't correctly understand the use of the trace level or the configuration for trace messages. If someone could point out the error of my ways then I can fix my app logging.

Sample code that fails below.

<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
    <head>
        <title>log4javascript example from  manual</title>
        <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
        <meta name="author" content="Tim Down - tim@log4javascript.org" />
        <meta name="description" content="log4javascript, a logging framework for JavaScript based on log4j" />
        <meta name="robots" content="all" />
        <script type="text/javascript" src="/tracker/libraries/log4javascript.js"></script>
        <script type="text/javascript">
            //<![CDATA[
            var log = log4javascript.getLogger();
            var popUpAppender = new log4javascript.PopUpAppender();
            var popUpLayout = new log4javascript.PatternLayout("%d{HH:mm:ss} %-5p - %m%n");
            popUpAppender.setLayout(popUpLayout);

            // new line below
            popUpAppender.setThreshold(log4javascript.Level.TRACE);

            log.addAppender(popUpAppender);

            log.debug("Debugging message (appears in pop-up)");
            log.error("Error message (appears in pop-up and in server log)");

            // new line below
            log.trace("Trace message");

            //]]>
        </script>
    </head>
    <body>
        <h1>log4javascript example from  manual</h1>

        <script type="text/javascript">
            var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
            document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
        </script>
        <script type="text/javascript">
            var pageTracker = _gat._getTracker("UA-448786-3");
            pageTracker._initData();
            pageTracker._trackPageview();
        </script>

    </body>
</html>

Tim Down · Accepted Answer · 2018-09-03T09:09:55.243

7

The problem is that the logger has a threshold level as well, which is set to DEBUG by default. Add the following line before calling log.trace():

log.setLevel(log4javascript.Level.TRACE);

edited Sep 03 '18 at 09:09

answered Oct 02 '12 at 14:36

Tim Down

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Thanks Tim - I figured it was something simple I had missed. Is their a sample in the doco that demonstrates this? – RoyHB Oct 02 '12 at 22:22
One more question, Tim - does log4javascript_lite support the trace level? – RoyHB Oct 03 '12 at 06:12
@RoyHB: I don't think there's a sample in the documentation about enabling trace. I may add one. Re. log4javascript_lite, yes, that supports the trace level. The same trick should get it working, and there's no messing about with appenders to do. – Tim Down Oct 03 '12 at 09:44
Thanks, I ran into the exact same issue, trying to set my `Logger.browserConsoleAppender.setThreshold(log4javascript.Level.TRACE);` but didn't work, I don't really get why the `Appender` threshold doesn't override the `log.level`, but okay :) – Vadorequest Apr 08 '15 at 10:21
this is log4javascript.Levels.TRACE. Levels with a S. – mik3fly-4steri5k Sep 02 '18 at 13:08
@mik3fly-4steri5k: There is no `log4javascript.levels` or `log4javascript.Levels`. – Tim Down Sep 03 '18 at 09:10

log4javascript - no trace messages appear

1 Answers1