diff --git a/js/preserve-advanced-search.js b/js/preserve-advanced-search.js
new file mode 100644
index 0000000..41dc943
--- /dev/null
+++ b/js/preserve-advanced-search.js
@@ -0,0 +1,69 @@
+(function ($, Drupal, once) {
+  'use strict';
+
+  Drupal.behaviors.preserveAdvancedSearchParams = {
+    attach: function (context, settings) {
+
+      console.log('preserve-advanced-search.js loaded');
+
+      // Extract a[] params from the current page URL
+      const rawSearch = window.location.search;
+      const aParams = rawSearch
+        .substring(1)
+        .split('&')
+        .filter(part => part.startsWith('a%5B') || part.startsWith('a['))
+        .join('&');
+
+      console.log('[AdvSearch] aParams found:', aParams);
+
+      // Nothing to preserve — bail out
+      if (!aParams) return;
+
+      // Target the <ul> that has data-drupal-facet-id
+      // then find the .facet-slider inside it which is the noUiSlider element
+      once('preserve-advsearch-slider', '[data-drupal-facet-id]', context)
+        .forEach(function (el) {
+          const facetId = el.dataset.drupalFacetId;
+          const sliderEl = el.querySelector('.facet-slider');
+
+          console.log('[AdvSearch] Found facet:', facetId, 'slider el:', sliderEl);
+
+          if (!sliderEl || !sliderEl.noUiSlider) {
+            console.warn('[AdvSearch] No noUiSlider instance found on', sliderEl);
+            return;
+          }
+
+          // Get the facet settings from drupalSettings
+          const facetSettings = settings.facets && settings.facets[facetId];
+          console.log('[AdvSearch] facetSettings:', facetSettings);
+
+          if (!facetSettings) {
+            console.warn('[AdvSearch] No drupalSettings.facets entry for:', facetId);
+            return;
+          }
+
+          // Remove original change listener and replace with patched version
+          sliderEl.noUiSlider.off('change');
+          sliderEl.noUiSlider.on('change', function (values, handle, unencoded) {
+            let newUrl;
+
+            if (facetSettings.range) {
+              newUrl = facetSettings.url
+                .replace('__range_slider_min__', Math.round(unencoded[0]))
+                .replace('__range_slider_max__', Math.round(unencoded[1]));
+            } else {
+              newUrl = facetSettings.urls['f_' + values[0]];
+            }
+
+            console.log('[AdvSearch] Navigating to:', newUrl + '&' + aParams);
+
+            const separator = newUrl.includes('?') ? '&' : '?';
+            window.location.href = newUrl + separator + aParams;
+          });
+
+          console.log('[AdvSearch] Slider change handler patched successfully');
+        });
+    }
+  };
+
+})(jQuery, Drupal, once);
diff --git a/olivesnews-preserve-advanced-search.patch b/olivesnews-preserve-advanced-search.patch
new file mode 100644
index 0000000..87ab085
--- /dev/null
+++ b/olivesnews-preserve-advanced-search.patch
@@ -0,0 +1,29 @@
+diff --git a/olivesnews.libraries.yml b/olivesnews.libraries.yml
+index 75479c7..701e67f 100755
+--- a/olivesnews.libraries.yml
++++ b/olivesnews.libraries.yml
+@@ -73,6 +73,14 @@ nouislider-year-format:
+   dependencies:
+     - core/drupal
+ 
++preserve-advanced-search:
++  js:
++    js/preserve-advanced-search.js: {}
++  dependencies:
++    - core/drupal
++    - core/once
++    - core/jquery
++
+ book:
+   version: VERSION
+   css:
+diff --git a/olivesnews.theme b/olivesnews.theme
+index e81fa1d..e1ceeaf 100755
+--- a/olivesnews.theme
++++ b/olivesnews.theme
+@@ -747,4 +747,5 @@ function _olivesnews_hex_to_hsl(string $hex_string)
+ function olivesnews_preprocess_page(&$variables)
+ {
+     $variables['#attached']['library'][] = 'olivesnews/nouislider-year-format';
++    $variables['#attached']['library'][] = 'olivesnews/preserve-advanced-search';
+ }
diff --git a/olivesnews.libraries.yml b/olivesnews.libraries.yml
index 75479c7..701e67f 100755
--- a/olivesnews.libraries.yml
+++ b/olivesnews.libraries.yml
@@ -73,6 +73,14 @@ nouislider-year-format:
   dependencies:
     - core/drupal
 
+preserve-advanced-search:
+  js:
+    js/preserve-advanced-search.js: {}
+  dependencies:
+    - core/drupal
+    - core/once
+    - core/jquery
+
 book:
   version: VERSION
   css:
diff --git a/olivesnews.theme b/olivesnews.theme
index e81fa1d..e1ceeaf 100755
--- a/olivesnews.theme
+++ b/olivesnews.theme
@@ -747,4 +747,5 @@ function _olivesnews_hex_to_hsl(string $hex_string)
 function olivesnews_preprocess_page(&$variables)
 {
     $variables['#attached']['library'][] = 'olivesnews/nouislider-year-format';
+    $variables['#attached']['library'][] = 'olivesnews/preserve-advanced-search';
 }