So here is the answer: Inside the hook theme function of your module use this code
function get_price_theme() { return [ 'mail_to_eberhard' => array ( 'template' => 'mail-to-eberhard', // TWIG File 'variables' => array('submitted_data'=>[]), ), ]; }
where variables is the array of parameter you want to send to the template file. Now create a template file named as mail-to-eberhard.html.twig inside your modules template folder. Then inside the hook_mail() alter function use this code.
function get_price_mail($key, &$message, $params) { switch ($key) { case 'mail_to_eberhard': $message['headers']['Content-Type'] = 'text/html; charset=UTF-8; format=flowed; delsp=yes'; //$message['from'] = \Drupal::config('system.site')->get('mail'); $message['subject'] = t('Factory Purchase - ').\Drupal::config('system.site')->get('name');; //$message['subject'] = t('Article created: @title', array('@title' => $params['node_title']), $options); // Render the template to HTML // Set up email template $body_data = array ( '#theme' => 'mail_to_eberhard', '#submitted_data' => $params['message'] ); //$message['body']['#theme'] = 'mail_to_eberhard'; $message['body'][] = \Drupal::service('renderer')->render($body_data); break; } }
now inside you template file you can use the array variables like this
You have received one new message from the Get Price Tab.<br/><br/> <b>Full Name</b> : {{ submitted_data['user_full_name'] }}<br/> <b>Email</b> : {{ submitted_data['user_email'] }}<br/> <b>Phone</b> : {{ submitted_data['user_number'] }}<br/> <b>State</b> : {{ submitted_data['user_state'] }}<br/> <b>Product SKU</b> : {{ submitted_data['product_sku'] }}<br/> <b>Product URL</b> : <a href='{{ submitted_data['product_url'] }}'>{{ submitted_data['product_url'] }}</a> <br/><b>Message</b> : {{ submitted_data['user_message'] }`
