initial commmit

README.md

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+# Bigfork Google Analytics
+
+Slimline module for configuring Google Analytics via SilverStripe CMS. Designed for use by [Bigfork]('http://www.bigfork.co.uk') - feel free to use/modify it.
+
+##Installation:
+```composer require bigfork/bfgoogleanalytics ^3.0```
+
+Add tracking code details via "Settings" menu.

_config/config.yml

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+---
+Name: 'google-analytics'
+---
+SilverStripe\SiteConfig\SiteConfig:
+  extensions:
+    - BigforkGoogleAnalytics\GoogleConfig
+SilverStripe\CMS\Controllers\ContentController:
+  extensions:
+    - BigforkGoogleAnalytics\GoogleLogger

code/GoogleConfig.php

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+<?php
+
+namespace BigforkGoogleAnalytics;
+
+use SilverStripe\Forms\FieldList;
+use SilverStripe\Forms\LiteralField;
+use SilverStripe\Forms\Tab;
+use SilverStripe\Forms\TextField;
+use SilverStripe\Forms\TextareaField;
+use SilverStripe\ORM\DataExtension;
+
+class GoogleConfig extends DataExtension
+{
+    private static $db = [
+        'GoogleAnalyticsTrackingID' => 'Varchar',
+        'GoogleAnalyticsParameters' => 'Text',
+        'GoogleAnalyticsConstructorParameters' => 'Text'
+    ];
+
+    /**
+     * @inheritdoc
+     */
+    public function updateCMSFields(FieldList $fields)
+    {
+        $analyticsFields = FieldList::create(
+            LiteralField::create('', '<div class="message warning">Tracking will be output using gtag.js</div>'),
+            TextField::create("GoogleAnalyticsTrackingID", "Google Analytics Tracking ID")
+                ->setDescription("e.g. UA-XXXXXX-X"),
+            TextareaField::create("GoogleAnalyticsConstructorParameters", "Additional Configuration")
+                ->setDescription("<strong>Advanced users only.</strong>
+					An object to be passed as an argument to gtag config. If you do not know what this field does, please leave it blank. "),
+            TextareaField::create("GoogleAnalyticsParameters", "Additional Google Analytics Properties")
+                ->setDescription("<strong>Advanced users only.</strong>
+					 Insert additional code after the initial gtag config. If you do not know what this does, please leave this field blank.")
+        );
+
+        $fields->addFieldToTab('Root', Tab::create('GoogleAnalytics')->setChildren($analyticsFields));
+    }
+}

code/GoogleLogger.php

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+<?php
+
+namespace BigforkGoogleAnalytics;
+
+use SilverStripe\Core\Extension;
+use SilverStripe\SiteConfig\SiteConfig;
+use SilverStripe\View\ArrayData;
+use SilverStripe\View\Requirements;
+
+class GoogleLogger extends Extension
+{
+    public function onAfterInit()
+    {
+        if ($this->owner->getRequest()->getVar('CMSPreview')) {
+            return;
+        }
+
+        $config = SiteConfig::current_site_config();
+
+        // include the JS snippet into the frontend page markup
+        if ($trackingID = $config->GoogleAnalyticsTrackingID) {
+            $analyticsData = new ArrayData([
+                'GoogleAnalyticsTrackingID' => $trackingID,
+                'GoogleAnalyticsParameters' => $config->GoogleAnalyticsParameters,
+                'GoogleAnalyticsConstructorParameters' => $config->GoogleAnalyticsConstructorParameters
+            ]);
+            Requirements::insertHeadTags($analyticsData->renderWith('GoogleAnalyticsJSSnippet'), 'GoogleAnalytics');
+        }
+    }
+}

composer.json

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+{
+	"name": "bigfork/google-analytics",
+	"type": "silverstripe-vendormodule",
+	"description": "Slimline module for configuring Google Analytics via SilverStripe CMS. Intended for advanced users, the ability to add parameters through CMS makes it very possible to break the whole site.",
+	"authors": [{
+		"name": "Loz Calver",
+		"email": "lozcalver@bigfork.co.uk"
+	}, {
+        "name": "Colin Richardson",
+        "email": "colinrichardson@bigfork.co.uk"
+    }],
+	"require":
+	{
+		"silverstripe/framework": "^4",
+		"silverstripe/cms": "^4"
+	}
+}

templates/GoogleAnalyticsJSSnippet.ss

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+<script async src="https://www.googletagmanager.com/gtag/js?id={$GoogleAnalyticsTrackingID}"></script>
+<script>
+    window.dataLayer = window.dataLayer || [];
+    function gtag(){dataLayer.push(arguments);}
+    gtag('js', new Date());
+    gtag('config', '{$GoogleAnalyticsTrackingID}'<% if $GoogleAnalyticsConstructorParameters %>, {$GoogleAnalyticsConstructorParameters.RAW}<% end_if %>);<% if $GoogleAnalyticsParameters %>
+    {$GoogleAnalyticsParameters.RAW}<% end_if %>
+</script>