1 files changed, 46 insertions, 0 deletions
diff --git a/static/js/pager.ts b/static/js/pager.ts
new file mode 100644
index 0000000..de60bcd
--- /dev/null
+++ b/static/js/pager.ts
@@ -0,0 +1,46 @@
+(function () {
+  const url = self.location.href.split("#")[0];
+  let settings = { pager: {} };
+
+  self.addEventListener("DOMContentLoaded", function () {
+    if (history.scrollRestoration) history.scrollRestoration = "manual";
+    if (localStorage["settings"]) {
+      settings = JSON.parse(localStorage["settings"]);
+    }
+    if (self.location.href.indexOf("#") >= 0) {
+      settings["pager"][url] = self.pageYOffset;
+      localStorage["settings"] = JSON.stringify(settings);
+      document.getElementById(location.hash.slice(1)).scrollIntoView();
+      return;
+    }
+    if (settings["pager"][url] > 0) {
+      self.scrollTo(0, settings["pager"][url]);
+      return;
+    }
+    settings["pager"][url] = self.pageYOffset;
+    localStorage["settings"] = JSON.stringify(settings);
+  });
+
+  self.addEventListener("scroll", function () {
+    const currentPosition = self.pageYOffset;
+    settings["pager"][url] = currentPosition;
+    localStorage["settings"] = JSON.stringify(settings);
+  });
+
+  self.addEventListener("DOMContentLoaded", function () {
+    const up = document.getElementById("top");
+    const back = document.getElementById("back");
+
+    if (document.body.contains(up)) up.href = "javascript: void(0)";
+    if (document.body.contains(back)) back.href = "javascript: void(0)";
+
+    self.addEventListener("click", function (event) {
+      if (document.body.contains(up) && up.contains(event.target)) {
+        window.scrollTo(0, 0);
+      }
+      if (document.body.contains(back) && back.contains(event.target)) {
+        history.go(-1);
+      }
+    });
+  });
+})();