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AMP shim support for Gravity Forms submissions
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| <?php | |
| /** | |
| * AMP Gravity Forms Submission Shim plugin bootstrap. | |
| * | |
| * @package Google\AMP_Gravity_Forms_Submission_Shim | |
| * @author Weston Ruter, Google | |
| * @license GPL-2.0-or-later | |
| * @copyright 2020 Google Inc. | |
| * | |
| * @wordpress-plugin | |
| * Plugin Name: AMP Gravity Forms Submission Shim | |
| * Plugin URI: https://gist.github.com/westonruter/b2554073461707a88057bb86b6b603d6 | |
| * Description: Plugin which shims AMP compatibility for Gravity Forms by fixing redirection upon submission and ensuring HTML5 form validation is used for required fields. | |
| * Version: 0.1.4 | |
| * Author: Weston Ruter | |
| * Author URI: https://weston.ruter.net/ | |
| * License: GNU General Public License v2 (or later) | |
| * License URI: http://www.gnu.org/licenses/gpl-2.0.html | |
| * Gist Plugin URI: https://gist.github.com/westonruter/b2554073461707a88057bb86b6b603d6 | |
| */ | |
| // Shim support for Gravity Form submissions on AMP pages. | |
| add_action( 'gform_post_submission', function() { | |
| $location = null; | |
| foreach ( headers_list() as $header ) { | |
| if ( preg_match( '/^Location:\s*(.+)/i', $header, $matches ) ) { | |
| $location = $matches[1]; | |
| break; | |
| } | |
| } | |
| if ( $location ) { | |
| header_remove( 'Location' ); | |
| header( "AMP-Redirect-To: $location" ); | |
| header( 'AMP-Access-Control-Allow-Source-Origin: ' . home_url() ); | |
| header( 'Access-Control-Expose-Headers: AMP-Redirect-To, AMP-Access-Control-Allow-Source-Origin' ); | |
| wp_send_json( | |
| [ | |
| 'message' => __( 'Redirecting…', 'amp' ), | |
| 'redirecting' => true, // Make sure that the submit-success doesn't get styled as success since redirection _could_ be to error page. | |
| ], | |
| 200 | |
| ); | |
| } | |
| } ); | |
| // Use client-side validation UI instead of showing validation errors after page reload. Props Rahul Bansal at rtCamp. | |
| add_filter( 'gform_field_content', function( $content, $field ) { | |
| if ( $field->isRequired ) { | |
| return str_replace( 'aria-required=', 'required=', $content ); | |
| } | |
| return $content; | |
| }, 10, 2 ); |
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Installation instructions: https://gist.github.com/westonruter/6110fbc4bef0c4b8c021a112012f7e9c