Add default email for newsletter preview, disallow empty email

assets/js/src/newsletter_editor/components/sidebar.js

@@ -248,11 +248,23 @@ define([
       // testing sending method
       console.log('trying to send a preview');
       // get form data
+      var $emailField = this.$('#mailpoet_preview_to_email');
       var data = {
-        subscriber: this.$('#mailpoet_preview_to_email').val(),
+        subscriber: $emailField.val(),
         id: App.getNewsletter().get('id'),
       };
 
+      if (data.subscriber.length <= 0) {
+        MailPoet.Notice.error(
+          App.getConfig().get('translations.newsletterPreviewEmailMissing'),
+          {
+            positionAfter: $emailField,
+            scroll: true,
+          }
+        );
+        return false;
+      }
+
       // send test email
       MailPoet.Modal.loading(true);
 

lib/Config/Menu.php

@@ -380,6 +380,7 @@ class Menu {
 
     $data = array(
       'customFields' => $custom_fields,
+      'settings' => Setting::getAll(),
     );
     wp_enqueue_media();
     wp_enqueue_script('tinymce-wplink', includes_url('js/tinymce/plugins/wplink/plugin.js'));

views/newsletter/form.html

@@ -1242,6 +1242,8 @@
           '<%= __('Select a shortcode') %>',
         unsubscribeLinkMissing:
           '<%= __('Please include an unsubscribe link to continue.') %>',
+        newsletterPreviewEmailMissing:
+          '<%= __('Please enter an email where newsletter preview should be sent to.') %>',
         newsletterPreviewSent:
           '<%= __('Newsletter preview email has been successfully sent!') %>',
         newsletterPreviewFailedToSend:
@@ -1264,7 +1266,7 @@
         imageMissing: '<%= image_url(
           "newsletter_editor/image-missing.svg"
         ) %>',
-      }
+      },
     };
 
     var editor = null;

views/newsletter/templates/components/sidebar/preview.hbs

@@ -4,7 +4,7 @@
     <div class="mailpoet_form_field">
         <label>
             <%= __('Send preview to') %><br />
-            <input id="mailpoet_preview_to_email" class="mailpoet_input mailpoet_input_full" type="text" name="to_email" value="{{ from_email }}" />
+            <input id="mailpoet_preview_to_email" class="mailpoet_input mailpoet_input_full" type="text" name="to_email" value="<%= settings.sender.address %>" />
         </label>
     </div>