[OpenLayers-Dev] Integrate simple logging framework in 3.0?

[Gregers Gram Rygg]

Hi,

In the constructor signatures thread I brought up the need for a
logging framework. What do others think?

To throw Errors is quite useless from a minified library, since the
file name and line number is not related to a human readable source.
I've started to wrap my classes with a function to get a private
scope. Then I can have a "private static" log object for the class:

SMap.Layer.Pois = (function(){
  var superObj = OpenLayers.Layer
    ,log = Logger.getLogger('SMap.Layer.Pois');

  return OpenLayers.Class(superObj, {...});
}());

To use a private scope is another discussion. The log object could
easily just be a property on the prototype instead.

The log framework returns an object with log, debug, info, warn and
error methods. So I can easily log from anywhere in the class:
log.error("Constructor argument options require property: " +
this.requiredOptions[i]);

Which clearly show an error with the class name in Firebug, IE8,
Opera, Safari and Chrome.

Default turned off for production environments. To debug:
Logger.modules = {
    '*':  'WARN',
    'SMap.Layer.Pois': 'DEBUG'
};

Or dynamically during runtime:
initialize: function() {
  Logger.modules['SMap.Layer.Pois'] = "DEBUG";
  ...
}

I suppose there are better logging frameworks out in there, but we
will gladly donate ours if there is an interest. See full source here:
http://kart.finn.no/rel/head/js/external/logger/Logger.js

What are others using? log4js?
Is it a de facto standard log library for JavaScript, like log4j in Java?


Best regards,
Gregers