From dbc1f483e269cf33fcb3c6db25042ec5d0a83a69 Mon Sep 17 00:00:00 2001
From: komejo <komejo@gmail.com>
Date: Wed, 11 Dec 2024 12:16:56 -0800
Subject: [PATCH] #305 - a more useful map-loader to optimize mobile

---
 .../templates/wri-region-map.html.twig        |   2 +-
 .../custom/ts_wrin/js/components/wri_maps.js  | 123 ++++++++++++------
 .../ts_wrin/sass/components/_region-map.scss  |   8 ++
 3 files changed, 92 insertions(+), 41 deletions(-)

diff --git a/modules/wri_maps/templates/wri-region-map.html.twig b/modules/wri_maps/templates/wri-region-map.html.twig
index a15581b31..7d32f3f09 100644
--- a/modules/wri_maps/templates/wri-region-map.html.twig
+++ b/modules/wri_maps/templates/wri-region-map.html.twig
@@ -10,7 +10,7 @@
  */
 #}
 <div{{ attributes }}>
-  {% include svg_url ignore missing %}
+  <div id="interactive-map" data-svg-url="{{ svg_url }}" class="interactive-map"></div>
   <div class="wri-region-map-popup"></div>
   <button class="wri-region-map-popup-button"></button>
 </div>
diff --git a/themes/custom/ts_wrin/js/components/wri_maps.js b/themes/custom/ts_wrin/js/components/wri_maps.js
index 5e9e81c2b..ca1380b71 100644
--- a/themes/custom/ts_wrin/js/components/wri_maps.js
+++ b/themes/custom/ts_wrin/js/components/wri_maps.js
@@ -1,51 +1,94 @@
 /**
  * @file
  *
- * WRI Maps
+ * WRI Maps with SVG loading and resize debounce.
  */
-export default function(context) {
+export default function (context) {
   const $ = jQuery;
 
-  $(".wri-region-map", context).each(function() {
-    let $map = $(this);
-    let nids = [];
+  // SVG loading logic with debounce.
+  const mapContainer = document.getElementById('interactive-map');
+  const svgUrl = mapContainer?.getAttribute('data-svg-url');
 
-    $map.find("svg > g").each(function() {
-      let matches = $(this)
-        .attr("id")
-        .match(/^node-(\d+)/, "");
-      if (matches && matches.length > 1) {
-        nids.push(matches[1]);
-      }
-    });
+  let debounceTimer;
 
-    if (nids.length) {
-      $.ajax("/wri_maps/region-map/json", {
-        data: {
-          nids: nids
-        },
-        success: function(result) {
-          $.each(result, function(nid, data) {
-            $map
-              .find("svg > g[id='node-" + nid + "']")
-              .addClass(data.type)
-              .attr("aria-label", data.title)
-              .attr("tabindex", "0")
-              .on("click keypress", function(event) {
-                if (event.type == "click" || event.keyCode == 13) {
-                  if ($(window).width() < 768) {
-                    // Open region map popup on small screens.
-                    $map.find(".wri-region-map-popup-button").trigger("click");
-                    $map.find(".wri-region-map-popup").html(data.popup);
-                  } else {
-                    // Go directly to the node on larger screens.
-                    window.location = data.url;
-                  }
-                }
-              });
-          });
+  function loadSVG() {
+    if (!mapContainer || !svgUrl) {
+      return;
+    }
+
+    if (window.innerWidth >= 765 && !mapContainer.dataset.loaded) {
+      fetch(svgUrl)
+        .then((response) => {
+          if (response.ok) {
+            return response.text();
+          }
+          throw new Error('SVG could not be loaded.');
+        })
+        .then((svgContent) => {
+          mapContainer.innerHTML = svgContent;
+          mapContainer.dataset.loaded = true;
+          processRegionMapNodes(context);
+        })
+        .catch((error) => {
+          console.error(error);
+        });
+    }
+  }
+
+  function debounceResize() {
+    clearTimeout(debounceTimer);
+    debounceTimer = setTimeout(loadSVG, 200);
+  }
+
+  // Function to process .wri-region-map nodes.
+  function processRegionMapNodes(context) {
+    $(".wri-region-map", context).each(function () {
+      let $map = $(this);
+      let nids = [];
+
+      $map.find("svg > g").each(function () {
+        let matches = $(this).attr("id").match(/^node-(\d+)/, "");
+        if (matches && matches.length > 1) {
+          nids.push(matches[1]);
         }
       });
-    }
-  });
+
+      if (nids.length) {
+        $.ajax("/wri_maps/region-map/json", {
+          data: { nids: nids },
+          success: function (result) {
+            $.each(result, function (nid, data) {
+              $map
+                .find("svg > g[id='node-" + nid + "']")
+                .addClass(data.type)
+                .attr("aria-label", data.title)
+                .attr("tabindex", "0")
+                .on("click keypress", function (event) {
+                  if (event.type == "click" || event.keyCode == 13) {
+                    if ($(window).width() < 768) {
+                      // Open region map popup on small screens.
+                      $map.find(".wri-region-map-popup-button").trigger("click");
+                      $map.find(".wri-region-map-popup").html(data.popup);
+                    } else {
+                      // Go directly to the node on larger screens.
+                      window.location = data.url;
+                    }
+                  }
+                });
+            });
+          },
+        });
+      }
+    });
+  }
+
+  // Initial SVG loading and setup.
+  loadSVG();
+
+  // Add debounce for window resize.
+  window.addEventListener("resize", debounceResize);
+
+  // Ensure node processing on AJAX or content updates.
+  processRegionMapNodes(context);
 }
diff --git a/themes/custom/ts_wrin/sass/components/_region-map.scss b/themes/custom/ts_wrin/sass/components/_region-map.scss
index 809675562..7ba0657a7 100644
--- a/themes/custom/ts_wrin/sass/components/_region-map.scss
+++ b/themes/custom/ts_wrin/sass/components/_region-map.scss
@@ -52,6 +52,14 @@
   }
 }
 
+.interactive-map {
+  width: 100%;
+  height: auto;
+  background-color: $white;
+  text-align: center;
+  aspect-ratio: 923.2/448;
+}
+
 .wri-region-map {
   @include center-columns($grid-columns-mobile, $grid-columns-mobile);