Merge pull request alinemorelli#9 from alinemorelli/environments

Add support to gtm environments alinemorelli#6

README.md

@@ -162,12 +162,49 @@ const app = document.getElementById('app')
 ReactDOM.render(<Router routes={routes} />, app)
 ```
 
+## Environments
+
+Configure how Tag Manager will works between development and production server environments.
+
+### Example:
+
+```js
+import React from 'react'
+import ReactDOM from 'react-dom'
+import Router from 'react-router'
+import routes from './routes'
+
+...
+import TagManager from 'react-gtm-module'
+
+const tagManagerArgs = {
+    gtmId: 'GTM-000000',
+    auth: '6sBOnZx1hqPcO01xPOytLK',
+    preview: 'env-2'
+}
+
+TagManager.initialize(tagManagerArgs)
+
+```
+
+##### How can I find auth and preview?
+Go to Google Tag Manager -> ADMIN -> Environments -> Actions -> Get Snippet.
+Look for gtm_auth and gtm_preview
+
+##### Don't know to use GTM environments? 
+   - https://support.google.com/tagmanager/answer/6311518
+   - https://www.simoahava.com/analytics/better-qa-with-google-tag-manager-environments/
+
+
+
 |Value|Type|Required|Notes|
 |------|-----|-----|-----|
 |gtmId| `String`| Yes | GTM id, must be something like `GTM-000000`.|
 |dataLayer| `Object`| No | Object that contains all of the information that you want to pass to Google Tag Manager.|
 |dataLayerName| `String`| No | Custom name for dataLayer object.|
 |events| `Object`| No | Additional events such as 'gtm.start': new Date().getTime(),event:'gtm.js'.|
+|auth| `String` | No | used to set environments. |
+|preview| `String` | No | used to set environments, something like `env-00`. |
 
 
 ### Note:

dist/Snippets.js

@@ -13,13 +13,18 @@ var Snippets = {
     var id = _ref.id,
         events = _ref.events,
         dataLayer = _ref.dataLayer,
-        dataLayerName = _ref.dataLayerName;
+        dataLayerName = _ref.dataLayerName,
+        preview = _ref.preview,
+        auth = _ref.auth;
+
+    var gtm_auth = '&gtm_auth=' + auth;
+    var gtm_preview = '&gtm_preview=' + preview;
 
     if (!id) (0, _warn2.default)('GTM Id is required');
 
-    var iframe = '\n      <iframe src="//www.googletagmanager.com/ns.html?id=' + id + '"\n        height="0" width="0" style="display:none;visibility:hidden" id="tag-manager"></iframe>';
+    var iframe = '\n      <iframe src="//www.googletagmanager.com/ns.html?id=' + id + gtm_auth + gtm_preview + '&gtm_cookies_win=x"\n        height="0" width="0" style="display:none;visibility:hidden" id="tag-manager"></iframe>';
 
-    var script = '\n      (function(w,d,s,l,i){w[l]=w[l]||[];\n        w[l].push({\'gtm.start\': new Date().getTime(),event:\'gtm.js\', ' + JSON.stringify(events).slice(1, -1) + '});\n        var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!=\'dataLayer\'?\'&l=\'+l:\'\';\n        j.async=true;j.src=\'//www.googletagmanager.com/gtm.js?id=\'+i+dl;\n        f.parentNode.insertBefore(j,f);\n      })(window,document,\'script\',\'' + dataLayerName + '\',\'' + id + '\');';
+    var script = '\n      (function(w,d,s,l,i){w[l]=w[l]||[];\n        w[l].push({\'gtm.start\': new Date().getTime(),event:\'gtm.js\', ' + JSON.stringify(events).slice(1, -1) + '});\n        var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!=\'dataLayer\'?\'&l=\'+l:\'\';\n        j.async=true;j.src=\'//www.googletagmanager.com/gtm.js?id=\'+i+dl+\'' + gtm_auth + gtm_preview + '&gtm_cookies_win=x\';\n        f.parentNode.insertBefore(j,f);\n      })(window,document,\'script\',\'' + dataLayerName + '\',\'' + id + '\');';
 
     var dataLayerVar = this.dataLayer(dataLayer, dataLayerName);
 

dist/TagManager.js

@@ -41,13 +41,19 @@ var TagManager = {
         events = _ref$events === undefined ? {} : _ref$events,
         dataLayer = _ref.dataLayer,
         _ref$dataLayerName = _ref.dataLayerName,
-        dataLayerName = _ref$dataLayerName === undefined ? 'dataLayer' : _ref$dataLayerName;
+        dataLayerName = _ref$dataLayerName === undefined ? 'dataLayer' : _ref$dataLayerName,
+        _ref$auth = _ref.auth,
+        auth = _ref$auth === undefined ? '' : _ref$auth,
+        _ref$preview = _ref.preview,
+        preview = _ref$preview === undefined ? '' : _ref$preview;
 
     var gtm = this.gtm({
       id: gtmId,
       events: events,
-      dataLayer: dataLayer || null,
-      dataLayerName: dataLayerName
+      dataLayer: dataLayer || undefined,
+      dataLayerName: dataLayerName,
+      auth: auth,
+      preview: preview
     });
     if (dataLayer) document.head.appendChild(gtm.dataScript);
     document.head.appendChild(gtm.script());