restore JS handler for "mark all news as read", fixes #1362

Closes #1362

Merge request studip/studip!839

app/controllers/news.php

@@ -187,7 +187,7 @@ class NewsController extends StudipController
             }
         }
 
-        $this->render_nothing();
+        $this->render_json(true);
     }
 
     /**

lib/modules/NewsWidget.php

@@ -35,7 +35,7 @@ class NewsWidget extends CorePlugin implements PortalPlugin
 
         if (StudipNews::CountUnread() > 0) {
             $navigation = new Navigation('', 'dispatch.php/news/visit_all');
-            $navigation->setImage(Icon::create('refresh', 'clickable', ["title" => _('Alle als gelesen markieren')]));
+            $navigation->setImage(Icon::create('refresh', 'clickable', ["title" => _('Alle als gelesen markieren')]), ['class' => 'visit-all']);
             $icons[] = $navigation;
         }
 

resources/assets/javascripts/bootstrap/startpage.js

@@ -5,7 +5,7 @@ STUDIP.domReady(() => {
 });
 
 // Add handler for "read all" on news widget
-$(document).on('click', '#start-index a[href*="newswidget/read_all"]', function(event) {
+$(document).on('click', '#start-index .visit-all', function(event) {
     var icon = $(this),
         url = icon.attr('href'),
         widget = icon.closest('.studip-widget');