init: simplify loading file path from hash

1 files changed, 19 insertions, 1 deletions

diff --git a/beamer/viewer/viewer.js b/beamer/viewer/viewer.js
index 21b369a..28c0187 100644
--- a/beamer/viewer/viewer.js
+++ b/beamer/viewer/viewer.js
@@ -66,7 +66,7 @@ class Viewer {
     this.fileInput.files = dummy.files;
   }
 
-  loadFromUrl(url) {
+  _loadFromUrl(url) {
     this._setFileName(url);
     this._setPresentation(url);
   }
@@ -94,5 +94,23 @@ class Viewer {
       event.preventDefault();
       event.stopPropagation();
     });
+
+    window.addEventListener('load', () => this._on_hash_change());
+    window.addEventListener('hashchange', () => this._on_hash_change());
+  }
+
+  _on_hash_change() {
+    const params = this._hash_params();
+    if ("file" in params)
+      this._loadFromUrl(params["file"]);
+  }
+
+  _hash_params() {
+    const queryDict = {};
+    location.hash.substr(1).split("&").forEach(item => {
+      const pair = item.split("=");
+      queryDict[pair[0]] = pair[1];
+    });
+    return queryDict;
   }
 }