[openstreetmap/openstreetmap-website] Map XML download with Turbo (PR #6255)

[mmd]

@mmd-osm commented on this pull request.



> +      try {
+        detailMessage = event?.detail?.error?.message;
+        if (!detailMessage) {
+          const responseText = await event.detail.fetchResponse.responseText;
+          const parser = new DOMParser();
+          const doc = parser.parseFromString(responseText, "text/html");
+          detailMessage = doc.body ? doc.body.textContent.trim() : "(unknown)";
+        }
+      } catch (err) {
+        detailMessage = "(unknown)";
+      }
+      // eslint-disable-next-line no-alert
+      alert(OSM.i18n.t("javascripts.share.export_failed", { reason: detailMessage }));
+    }
+
+    static getTurboBlobHandler(downloadCallback) {

@hlfan mentioned earlier on _I'd like to have downloadBlob separately to reuse it for the directions geojson download._

So that's why I kept it outside the class for now.

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