From eeca96f21b31bab30fa6a642b7d98c7a37be1240 Mon Sep 17 00:00:00 2001
From: Guilhem Moulin <guilhem@fripost.org>
Date: Sun, 28 Jan 2024 02:21:10 +0100
Subject: Put basemap name in location hash.

---
 main.js | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/main.js b/main.js
index b752e3e..28c885f 100644
--- a/main.js
+++ b/main.js
@@ -87,10 +87,7 @@ const extent = [110720, 6927136, 1159296, 7975712];
  *    https://www.lantmateriet.se/sv/om-lantmateriet/press/nyheter/lantmateriets-arbete-mot-oppna-data-i-full-gang/
  */
 const baseMapSource = new WMTS({
-  // XXX the 'layer' parameter should be passed in the options
-  // dictionary (like style and version), but there is no setLayer()
-  // method to switch from/to the toned down map
-  url: 'https://minkarta.lantmateriet.se/map/topowebbcache?layer=topowebb',
+  url: undefined,
   version: '1.0.0',
   style: 'default',
   matrixSet: '3006',
@@ -121,6 +118,7 @@ const view = new View({
   constrainResolution: false,
 });
 
+let baseMapLayer = 'topowebb';
 (function() {
   const params = new URLSearchParams(window.location.hash.substring(1));
   const x = parseFloat(params.get('x'));
@@ -132,6 +130,11 @@ const view = new View({
   if (!isNaN(z)) {
     view.setZoom(z);
   }
+
+  if (params.has('basemap')) {
+    baseMapLayer = params.get('basemap');
+  }
+  baseMapSource.setUrl(`https://minkarta.lantmateriet.se/map/topowebbcache?LAYER=${encodeURIComponent(baseMapLayer)}`);
 })();
 
 
@@ -793,9 +796,14 @@ map.addLayer(vectorLayer);
     label.setAttribute('for', input.id);
     label.innerHTML = 'Nedtonad bakgrund karta';
 
+    input.checked = baseMapLayer === 'topowebb_nedtonad';
     input.onchange = function(event) {
-      const layer = event.target.checked ? 'topowebb_nedtonad' : 'topowebb';
-      baseMapSource.setUrl('https://minkarta.lantmateriet.se/map/topowebbcache?LAYER=' + layer);
+      baseMapLayer = event.target.checked ? 'topowebb_nedtonad' : 'topowebb';
+      baseMapSource.setUrl(`https://minkarta.lantmateriet.se/map/topowebbcache?LAYER=${encodeURIComponent(baseMapLayer)}`);
+
+      const searchParams = new URLSearchParams(location.hash.substring(1));
+      searchParams.set('basemap', baseMapLayer);
+      location.hash = '#' + searchParams.toString();
     };
   })();
 })();
-- 
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