DAZ Shop (asof 20170315) - fix broken GA experimental code

// ==UserScript==
// @name        DAZ-GA-FIX
// @namespace   daz3d.com*
// @description Replaces broken chooseVariation() script with one that catches the error
// @include     http://www.daz3d.com/*
// @include     http://daz3d.com/*
// @version     1
// @grant       none
// @author      mork
// @license     no restrictions besides NOMIL+NOGOV
// @run-at document-start
// ==/UserScript==
//



// credits: http://stackoverflow.com/questions/3972038/stop-execution-of-javascript-function-client-side-or-tweak-it
checkForBadJavascripts ( [
    [false, /chooseVariation/, function () {addJS_Node (betterFunction);} ]
] );



function checkForBadJavascripts (controlArray) {
    /*--- Note that this is a self-initializing function.  The controlArray
        parameter is only active for the FIRST call.  After that, it is an
        event listener.

        The control array row is  defines like so:
        [bSearchSrcAttr, identifyingRegex, callbackFunction]
        Where:
            bSearchSrcAttr      True to search the SRC attribute of a script tag
                                false to search the TEXT content of a script tag.
            identifyingRegex    A valid regular expression that should be unique
                                to that particular script tag.
            callbackFunction    An optional function to execute when the script is
                                found.  Use null if not needed.
    */
    if ( ! controlArray.length) return null;

    checkForBadJavascripts      = function (zEvent) {

        for (var J = controlArray.length - 1;  J >= 0;  --J) {
            var bSearchSrcAttr      = controlArray[J][0];
            var identifyingRegex    = controlArray[J][1];

            if (bSearchSrcAttr) {
                if (identifyingRegex.test (zEvent.target.src) ) {
                    stopBadJavascript (J);
                    return false;
                }
            }
            else {
                if (identifyingRegex.test (zEvent.target.textContent) ) {
                    stopBadJavascript (J);
                    return false;
                }
            }
        }

        function stopBadJavascript (controlIndex) {
            zEvent.stopPropagation ();
            zEvent.preventDefault ();

            var callbackFunction    = controlArray[J][2];
            if (typeof callbackFunction == "function")
                callbackFunction ();

            //--- Remove the node just to clear clutter from Firebug inspection.
            zEvent.target.parentNode.removeChild (zEvent.target);

            //--- Script is intercepted, remove it from the list.
            controlArray.splice (J, 1);
            if ( ! controlArray.length) {
                //--- All done, remove the listener.
                window.removeEventListener (
                    'beforescriptexecute', checkForBadJavascripts, true
                );
            }
        }
    }

    /*--- Use the "beforescriptexecute" event to monitor scipts as they are loaded.
        See https://developer.mozilla.org/en/DOM/element.onbeforescriptexecute
        Note that it does not work on acripts that are dynamically created.
    */
    window.addEventListener ('beforescriptexecute', checkForBadJavascripts, true);

    return checkForBadJavascripts;
}


function betterFunction()  {
  var doorNumber = 0;
  try {
    doorNumber = cxApi.chooseVariation();
    if (typeof doorNumber != 'number')  {
      //console.log("doorNumber is not a number. Set to 0");
      doorNumber = 0;
    }
  } catch (e) {}

  $(document).ready(function() {
    var bodyElem = document.getElementsByTagName('body')[0];
    bodyElem.className = bodyElem.className + " door_number_"+doorNumber;
  });
}



function addJS_Node (text, s_URL, funcToRun) {
    var D                                   = document;
    var scriptNode                          = D.createElement ('script');
    scriptNode.type                         = "text/javascript";
    if (text)       scriptNode.textContent  = text;
    if (s_URL)      scriptNode.src          = s_URL;
    if (funcToRun)  scriptNode.textContent  = '(' + funcToRun.toString() + ')()';

    var targ = D.getElementsByTagName ('head')[0] || D.body || D.documentElement;
    //--- Don't error check here. if DOM not available, should throw error.
    targ.appendChild (scriptNode);
}