chore(repo): save local work

hemx-js/runtime/hemx.js

@@ -343,6 +343,7 @@
         await navigateUrl(pageRequestUrl(form, source), rootOf(form) || rootOf(el), mode);
         return;
       }
+      savePage(roots()[0]);
       const response = await fetch(requestUrl(form, data, method), {
         method,
         body,
@@ -382,7 +383,32 @@
     }
   }
 
+  function snapshotPage(root) {
+    return root ? {
+      hemx: true,
+      pageHtml: root.innerHTML,
+      pageTitle: document.title,
+      scrollX: window.scrollX,
+      scrollY: window.scrollY,
+    } : null;
+  }
+
+  function savePage(root) {
+    const snapshot = snapshotPage(root);
+    if (snapshot) history.replaceState(snapshot, "", location.href);
+  }
+
+  function restorePage(state, root) {
+    if (!root || !state || typeof state.pageHtml !== "string") return false;
+    root.innerHTML = state.pageHtml;
+    if (state.pageTitle) document.title = state.pageTitle;
+    bindRoot(root);
+    requestAnimationFrame(() => scrollTo(state.scrollX, state.scrollY));
+    return true;
+  }
+
   async function navigateUrl(href, root, mode = "replace") {
+    if (mode === "push") savePage(root);
     const response = await fetch(href, {
       headers: { "X-HEMX-Partial": "1", "Accept": "text/html" },
       credentials: "same-origin",
@@ -443,6 +469,8 @@
       return;
     }
     for (const op of batch.ops) applyOp(scope, op);
+    bindPolling(scope);
+    bindRevealed(scope);
   }
 
   function canApplyOp(scope, op) {
@@ -1101,6 +1129,19 @@
     stopDescendantPolling(root);
   }
 
+  function restoreRevealed(event) {
+    if (!event.persisted) return;
+    roots().forEach((root) => {
+      const observer = revealObservers.get(root);
+      if (observer) observer.disconnect();
+      revealObservers.delete(root);
+      forEachElement(root, (el) => {
+        if (attrEquals(el, "data-hemx-on", "revealed") || el.hasAttribute("data-hemx-revealed")) revealed.delete(el);
+      });
+      bindRevealed(root);
+    });
+  }
+
   function start() {
     roots().forEach((root) => {
       root.setAttribute("data-hemx-request-timeout-ms", String(REQUEST_TIMEOUT_MS));
@@ -1147,9 +1188,13 @@
     }
   }
 
-  addEventListener("popstate", () => {
+  window.addEventListener("pageshow", restoreRevealed);
+
+  addEventListener("popstate", (event) => {
     const root = roots()[0];
-    if (root) navigateUrl(location.href, root, "none").catch((error) => emit(root, "hemx:error", String(error)));
+    if (root && !restorePage(event.state, root)) {
+      if (root) navigateUrl(location.href, root, "none").catch((error) => emit(root, "hemx:error", String(error)));
+    }
   });
 
   window.hemx = Object.freeze({