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Editorial Team
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Asked: 2026-06-12T04:15:35+00:00

I’m using log4javascript version 1.4.3. In my app it works fine for all log

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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>
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1 Answer

  1. Editorial Team

    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);
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