WebGL 2.0 がサポートされているかチェックする (#390)

src/lib/geolonia-map.ts

@@ -8,7 +8,7 @@ import parseAtts from './parse-atts';
 import { SimpleStyle } from './simplestyle';
 import SimpleStyleVector from './simplestyle-vector';
 
-import { getContainer, getOptions, getSessionId, getStyle, handleRestrictedMode, isScrollable, parseControlOption, parseSimpleVector } from './util';
+import { getContainer, getOptions, getSessionId, getStyle, handleRestrictedMode, isScrollable, parseControlOption, parseSimpleVector, handleErrorMode } from './util';
 
 import type { MapOptions, PointLike, StyleOptions, StyleSpecification, StyleSwapOptions } from 'maplibre-gl';
 
@@ -46,10 +46,11 @@ export default class GeoloniaMap extends maplibregl.Map {
   private __styleExtensionLoadRequired: boolean;
 
   constructor(params: string | GeoloniaMapOptions) {
+
     const container = getContainer(params) as Container | false;
 
     if (!container) {
-      if ( typeof params === 'string') {
+      if (typeof params === 'string') {
         throw new Error(`[Geolonia] No HTML elements found matching \`${params}\`. Please ensure the map container element exists.`);
       } else {
         throw new Error('[Geolonia] No HTML elements found. Please ensure the map container element exists.');
@@ -142,16 +143,22 @@ export default class GeoloniaMap extends maplibregl.Map {
       return request;
     };
 
-    // Generate Map
-    super(options);
+    try {
+      // Generate Map
+      super(options);
+    } catch (error) {
+      handleErrorMode(container);
+      throw error;
+    }
+
     const map = this;
     this.geoloniaSourcesUrl = sourcesUrl;
     this.__styleExtensionLoadRequired = true;
 
     // Note: GeoloniaControl should be placed before another controls.
     // Because this control should be "very" bottom-left(default) or the attributed position.
     const { position: geoloniaControlPosition } = parseControlOption(atts.geoloniaControl);
-    map.addControl(new GeoloniaControl(),  geoloniaControlPosition);
+    map.addControl(new GeoloniaControl(), geoloniaControlPosition);
 
     map.addControl(new CustomAttributionControl(), 'bottom-right');
 
@@ -172,7 +179,7 @@ export default class GeoloniaMap extends maplibregl.Map {
 
     const { enabled: scaleControlEnabled, position: scaleControlPosition } = parseControlOption(atts.scaleControl);
     if (scaleControlEnabled) {
-      map.addControl(new ScaleControl({}),  scaleControlPosition);
+      map.addControl(new ScaleControl({}), scaleControlPosition);
     }
 
     map.on('load', (event) => {

src/lib/render.ts

@@ -67,7 +67,12 @@ export const renderGeoloniaMap = () => {
         if (!item.isIntersecting) {
           return;
         }
-        renderSingleMap(item.target);
+        try {
+          renderSingleMap(item.target);
+        } catch (e) {
+          // Not throw error because, following maps will not be rendered.
+          console.error('[Geolonia] Failed to initialize map', e); // eslint-disable-line
+        }
         observer.unobserve(item.target);
       });
     });
@@ -82,7 +87,12 @@ export const renderGeoloniaMap = () => {
 
     // render Map immediately
     for (let i = 0; i < containers.length; i++) {
-      renderSingleMap(containers[i]);
+      try {
+        renderSingleMap(containers[i]);
+      } catch (e) {
+        // Not throw error because, following maps will not be rendered.
+        console.error('[Geolonia] Failed to initialize map', e); // eslint-disable-line
+      }
     }
 
     // set intersection observer

src/lib/util.ts

@@ -272,6 +272,24 @@ export const handleRestrictedMode = (map) => {
   }
 };
 
+export const handleErrorMode = (container) => {
+
+  const errorContainer = document.createElement('div');
+  errorContainer.classList.add('geolonia__error-container');
+
+  const div = document.createElement('div');
+
+  const h1 = document.createElement('h2');
+  h1.textContent = 'Geolonia Maps';
+  div.appendChild(h1);
+
+  div.classList.add('geolonia__error-message');
+  div.innerHTML += '<div class="geolonia__error-message-description">地図の初期化に失敗しました。管理者にお問い合わせ下さい。開発者の方は開発者ツールでエラー詳細をご確認下さい。</div>';
+
+  errorContainer.appendChild(div);
+  container.appendChild(errorContainer);
+};
+
 export const sanitizeDescription = async (description) => {
   const { default: sanitizeHtml } = await import('sanitize-html');
   return sanitizeHtml(description, {
@@ -281,3 +299,4 @@ export const sanitizeDescription = async (description) => {
 };
 
 export const random = (max: number): number => Math.floor(Math.random() * max);
+

src/style.css

@@ -110,6 +110,34 @@
   background-size: cover;
 }
 
+/* Style for error message */
+.geolonia__error-container {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  height: 100%;
+  width: 100%;
+  background-color: #dedede;
+  z-index: 9999;
+  position: absolute;
+}
+
+.geolonia__error-message {
+  max-width: 300px;
+  background-color: #ffffff;
+  margin: 10px;
+  padding: 0.75rem 1.25rem;
+  border-radius: 6px;
+  position: absolute;
+  z-index: 99999;
+  word-wrap: break-word;
+  box-shadow: 0 4px 10px #0000001a
+}
+
+.geolonia__error-message-description {
+  margin: 15px 0;
+}
+
 /* CSS for Attribution */
 /* Fix: https://github.com/geolonia/embed/issues/291 */
 .maplibregl-map {