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<?php |
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/* |
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Plugin Name: Google Tag Manager |
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Plugin URI: http://wordpress.org/extend/plugins/google-tag-manager/ |
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Description: This is an implementation of the Tag Management system from Google. It adds a field to the existing General Settings page for the ID, and if specified, outputs the tag management javascript in the page footer. |
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Version: 1.0.3 |
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Author: George Stephanis |
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Author URI: http://stephanis.info |
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License: GPLv2 or later |
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*/ |
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|
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class google_tag_manager { |
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|
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public static $printed_noscript_tag = false; |
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|
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public static function go() { |
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add_filter( 'admin_init', array( __CLASS__, 'register_fields' ) ); |
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add_action( 'wp_head', array( __CLASS__, 'print_tag' ) ); |
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add_action( 'wp_body_open', array( __CLASS__, 'print_noscript_tag' ) ); // Core's new implementation! https://make.wordpress.org/themes/2019/03/29/addition-of-new-wp_body_open-hook/ |
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add_action( 'genesis_before', array( __CLASS__, 'print_noscript_tag' ) ); // Genesis |
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add_action( 'tha_body_top', array( __CLASS__, 'print_noscript_tag' ) ); // Theme Hook Alliance |
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add_action( 'body_top', array( __CLASS__, 'print_noscript_tag' ) ); // THA Unprefixed |
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add_action( 'wp_footer', array( __CLASS__, 'print_noscript_tag' ) ); // Fallback! |
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} |
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public static function register_fields() { |
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register_setting( 'general', 'google_tag_manager_id', 'esc_attr' ); |
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add_settings_field( 'google_tag_manager_id', '<label for="google_tag_manager_id">' . __( 'Google Tag Manager ID' , 'google_tag_manager' ) . '</label>' , array( __CLASS__, 'fields_html') , 'general' ); |
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} |
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public static function fields_html() { |
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?> |
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<input type="text" id="google_tag_manager_id" name="google_tag_manager_id" placeholder="ABC-DEFG" class="regular-text code" value="<?php echo get_option( 'google_tag_manager_id', '' ); ?>" /> |
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<p class="description"><?php _e( 'The ID from Google’s provided code (as emphasized):', 'google_tag_manager' ); ?><br /> |
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<code><noscript><iframe src="//www.googletagmanager.com/ns.html?id=<strong style="color:#c00;">ABC-DEFG</strong>"</code></p> |
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<p class="description"><?php _e( 'You can get yours <a href="https://www.google.com/tagmanager/">here</a>!', 'google_tag_manager' ); ?></p> |
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<?php |
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} |
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public static function print_tag() { |
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if ( ! $id = get_option( 'google_tag_manager_id', '' ) ) return; |
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?> |
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<!-- Google Tag Manager --> |
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<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': |
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new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], |
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j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= |
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'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); |
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})(window,document,'script','dataLayer','<?php echo esc_js( $id ); ?>');</script> |
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<!-- End Google Tag Manager --> |
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<?php |
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} |
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public static function print_noscript_tag() { |
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// Make sure we only print the noscript tag once. |
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// This is because we're trying for multiple hooks. |
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if ( self::$printed_noscript_tag ) { |
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return; |
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} |
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self::$printed_noscript_tag = true; |
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|
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if ( ! $id = get_option( 'google_tag_manager_id', '' ) ) return; |
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?> |
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<!-- Google Tag Manager (noscript) --> |
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<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=<?php echo esc_attr( $id ); ?>" |
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height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript> |
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<!-- End Google Tag Manager (noscript) --> |
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<?php |
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} |
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} |
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|
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google_tag_manager::go(); |
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