#859 Configurable results per page options

Author: j3nsch

application/configs/application.ini

@@ -203,6 +203,8 @@ searchengine.solr.facets = author_facet,year,doctype,language,has_fulltext,belon
 ; number of default search results
 searchengine.solr.parameterDefaults.rows = 10
 
+search.resultsPerPageOptions = 10, 20, 50, 100
+
 ; Configuration for search facets
 search.facet.default.translated = 0
 search.facet.default.limit = 10

library/Application/View/Helper/ResultsPerPageOptions.php

@@ -29,20 +29,22 @@
  * @license     http://www.gnu.org/licenses/gpl.html General Public License
  */
 
+use Opus\Common\ConfigTrait;
+
 /**
  * View helper for returning value of configuration option.
- *
- * TODO make class configurable (use different base class from Zend?)
  */
 class Application_View_Helper_ResultsPerPageOptions extends Application_View_Helper_Abstract
 {
+    use ConfigTrait;
+
     /**
      * @param int $steps
      * @return string
      */
     public function resultsPerPageOptions($steps = 0)
     {
-        $options = [10, 20, 50, 100];
+        $options = $this->getOptions();
 
         $output = '<ul>';
 
@@ -56,4 +58,24 @@ public function resultsPerPageOptions($steps = 0)
 
         return $output;
     }
+
+    public function getOptions(): array
+    {
+        $config = $this->getConfig();
+
+        $options = [];
+
+        if (isset($config->search->resultsPerPageOptions)) {
+            $list = $config->search->resultsPerPageOptions;
+            if (strlen(trim($list)) > 0) {
+                $options = array_filter(array_map('trim', explode(',', $list)));
+            }
+        }
+
+        if (count($options) === 0) {
+            $options = [10, 20, 50, 100]; // TODO do we need defaults in the code?
+        }
+
+        return $options;
+    }
 }

tests/library/Application/View/Helper/ResultsPerPageOptionsTest.php

@@ -0,0 +1,77 @@
+<?php
+
+/**
+ * This file is part of OPUS. The software OPUS has been originally developed
+ * at the University of Stuttgart with funding from the German Research Net,
+ * the Federal Department of Higher Education and Research and the Ministry
+ * of Science, Research and the Arts of the State of Baden-Wuerttemberg.
+ *
+ * OPUS 4 is a complete rewrite of the original OPUS software and was developed
+ * by the Stuttgart University Library, the Library Service Center
+ * Baden-Wuerttemberg, the Cooperative Library Network Berlin-Brandenburg,
+ * the Saarland University and State Library, the Saxon State Library -
+ * Dresden State and University Library, the Bielefeld University Library and
+ * the University Library of Hamburg University of Technology with funding from
+ * the German Research Foundation and the European Regional Development Fund.
+ *
+ * LICENCE
+ * OPUS is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the Licence, or any later version.
+ * OPUS is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details. You should have received a copy of the GNU General Public License
+ * along with OPUS; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * @copyright   Copyright (c) 2026, OPUS 4 development team
+ * @license     http://www.gnu.org/licenses/gpl.html General Public License
+ */
+
+class Application_View_Helper_ResultsPerPageOptionsTest extends ControllerTestCase
+{
+    /** @var string[] */
+    protected $additionalResources = ['view'];
+
+    /** @var Application_View_Helper_ResultsPerPageOptions */
+    protected $helper;
+
+    public function setUp(): void
+    {
+        parent::setUp();
+
+        $this->helper = new Application_View_Helper_ResultsPerPageOptions();
+        $this->helper->setView($this->getView());
+    }
+
+    public function testGetOptions()
+    {
+        $this->assertEqualsCanonicalizing(
+            ['10', '20', '50', '100'],
+            $this->helper->getOptions()
+        );
+    }
+
+    public function testGetOptionsMalformedList()
+    {
+        $this->adjustConfiguration([
+            'search' => ['resultsPerPageOptions' => '10, , 20, 50,100, 200, , '],
+        ]);
+        $this->assertEqualsCanonicalizing(
+            ['10', '20', '50', '100', '200'],
+            $this->helper->getOptions()
+        );
+    }
+
+    public function testGetOptionsEmptyList()
+    {
+        $this->adjustConfiguration([
+            'search' => ['resultsPerPageOptions' => ''],
+        ]);
+        $this->assertEqualsCanonicalizing(
+            ['10', '20', '50', '100'],
+            $this->helper->getOptions()
+        );
+    }
+}