Logging of Javascript error on the Frontend to the Backend

gistfile1.js

/* ==========================================================
 * 
 * Log on a remote server most of the errors in the browser 
 * 
 * @author Chris Cinelli
 * 
 * Depends on:
 *     stacktrace.js    - https://github.com/eriwen/javascript-stacktrace
 *     jsonStringify.js - http://www.thomasfrank.se/json_stringify_revisited.html
 * 
 * ========================================================== */


(function( $ ){

    var isLogOn = true; 

    //Compact version of Json in Errors logs
    JSONstring.compactOutput = true; 

  
    function myStringify(a)
    {
        try {
            //Try the more sophisticated JSONstring that support cyclical reference
            //It has unfortunately some probles sometimes: ""Illegal operation on WrappedNative prototype object" see http://stackoverflow.com/questions/965968/serialize-internal-javascript-objects-like-range
           return JSONstring.make(a);
        } catch (err) {
           //But if it does not work default to the browser JSON.stringify
           try {
                return JSON.stringify(a);
           } catch (err) {
               console.log("myStringify error serializing:")
               console.log(a);
               return "ERROR: CC.myStringify";
           }
        }
    }
    
    //URL of the action that log remotely
    var loggingUrl = "/utility/rlog";



    //Functions that are going to be accessible using CC.NameOfTheFunction
    var pub = {

      
      /*
       * Remote logging
       * Use CC.rlog (message), CC.rlog (type, message) or CC.rlog (type, message, notify)
       * Please prefer the format with "type". 
       * "type" is a word that help to identify where the log is cominig from. 
       * "notify": if true, send also an email to developers 
       * @author: Chris Cinelli
       */
      rlog: function(atype, amessage, notify){
        if (amessage === undefined)
        { //Only 1 paramer: it is the message
           amessage = atype;
           atype = "Generic";
        } 

        var param = {type: atype, message: amessage};
        if(notify) param.notify = true;

        $.ajax({
          type: 'post',
          dataType: 'text',   //Just we do not want it to fail for errors server side
          global: false,
          url: loggingUrl,
          data: param,
          success: function(d) {
            //Do we want to do anything? I do not think so
          },
          error: function(d){
              //Same here
          },
          complete:function(d){
              //Same here
          }
        });
      },
      
      //Enable or disable the remote logging
      setRemoteLogging: function (_state){
        isLogOn = !!_state;
      },
      
      stringfy: myStringify
      
    }   

    window.CC = pub;

    /*Let's log the jQuery ajax errors on the servers
     * 
     * @author: Chris Cinelli
     */

    $(document).ajaxError(function(event, jqXHR, ajaxSettings, thrownError) {
      if (!isLogOn) return;
      
      if(loggingUrl != ajaxSettings.url ) 
      {
            pub.rlog("ERROR", "AJAXERROR"+
               "|status:"+(jqXHR ? jqXHR.status : "NONE")+
               "|error:"+myStringify(thrownError)+
               "|event:"+ myStringify(event)+
               "|ajaxParam:"+ myStringify(ajaxSettings)+
               "|message:"+(jqXHR ? jqXHR.responseText : "NONE"));
      }
    }); 

    	
    /*Let's log Javascript errors on the server
     * 
     * @author: Chris Cinelli
     */
    function JSError(msg, url, l){
        if (!isLogOn) return;
        
        try
        {
            var trace = printStackTrace(); //Get the stack trace using stacktrace.js
            pub.rlog("ERROR", "JSERROR:[url:"+url+"|line:"+l+"|message:"+msg+"|trace:"+trace.join(' -> ')+"]", true);
        } catch(err) {
            try {
                 pub.rlog("ERROR", "AJAXERROR-EXCEPTION:"+ myStringify(err), true);
            }catch(err){
                pub.rlog("ERROR", "AJAXERROR-EXCEPTION-NEED-DEBUGGING2", true);
                console.dir(err);
            }
        }
    }

    //Defining a global variable BEFORE including this file noErrorHandler
    if (typeof noErrorHandler === 'undefined'){
        window.onerror = JSError;
        window.error = JSError;
    }

})( window.jQuery);