Added config options

Author: andrew

Readme.md

@@ -6,6 +6,10 @@ Currently split.js uses google analytics as the datastore for experiments, this
 
 ## Usage
 
+Basic Usage:
+
+    Split.setup(alternatives, options)
+
 Split.js is useful for running different functions and measuring the results, you define the alternatives that you wish to test:
 
     Split.setup({
@@ -20,6 +24,19 @@ Split.js is useful for running different functions and measuring the results, yo
 When a user hits the page they will be randomly assigned one alternative and that function will be executed.
 A custom variable will be set in google analytics with the name of that alternative which you can then pivot your analytics data around.
 
+## Options
+
+There are a number of configurable options that can be parsed as an optional second argument:
+
+    Split.setup({
+      // functions
+    },{
+      cookieName: 'abTest',
+      cookieAge: 30,
+      customVariableName: 'AB Test alternative',
+      customVariableIndex: 1
+    });
+
 ## Caveats
 
 * `Split.setup` must be loaded before Google analytics otherwise the custom variable will not be tracked,

example.html

@@ -13,6 +13,8 @@
             document.getElementById('heading').innerHTML = 'Chunky Bacon';
           }, false);
         }
+      },{
+        cookieName: 'split_test1'
       });
     </script>
   </head>

split.js

@@ -5,6 +5,15 @@
 // released under the MIT license
 
 Split = (function(){
+
+  var config = {},
+      defaults = {
+        cookieName: 'abTest',
+        cookieAge: 30,
+        customVariableName: 'AB Test alternative',
+        customVariableIndex: 1
+     }
+
   function createCookie(name,value,days) {
     if (days) {
       var date = new Date();
@@ -42,21 +51,32 @@ Split = (function(){
 
   function init(){
     alternatives = arguments[0]
+    options = arguments[1]
     keys = alternatives.keys()
 
-    var alternative = readCookie('abTest')
+    config = {}
+
+    if(options != undefined){
+      for(k in defaults){
+        config[k] = (options[k] != undefined) ? options[k] : defaults[k];
+      }
+    }else{
+      config = defaults;
+    }
+
+    var alternative = readCookie(config.cookieName)
     if (alternative) {
     } else {
       alternative = keys[Math.floor(Math.random()*keys.length)]
-      createCookie('abTest', alternative, 30)
+      createCookie(config.cookieName, alternative, config.cookieAge)
     }
     var _gaq = _gaq || [];
-    _gaq.push(['_setCustomVar', 1, 'AB Test alternative', alternative, 1]);
+    _gaq.push(['_setCustomVar', config.customVariableIndex, config.customVariableName, alternative, 1]);
     alternatives[alternative]();
   }
   return {
-    setup: function(args){
-      init(args)
+    setup: function(args, options){
+      init(args, options)
       }
     }
 })();