Removed ende template

main.py

@@ -2,6 +2,7 @@
 
 import sys
 import os
+import json
 
 from flask import Flask, render_template, request, send_from_directory
 
@@ -16,10 +17,14 @@ def custom_static(filename):
 def index():
     global files
     idx = int(request.args.get("image", 0))
-    if idx >= 0 and idx < len(files):
-        return render_template("index.html", img=files[idx], pageno=idx + 1)
-    else:
-        return render_template("ende.html")
+    if idx >= len(files):
+        idx = len(files) - 1
+    if idx < 0:
+        idx = 0
+    pageno = None
+    if idx >= 0 and idx < len(files) - 1:
+        pageno = idx + 1
+    return render_template("index.html", img=files[idx], pageno=json.dumps(pageno))
 
 def main():
     global files

templates/index.html

@@ -7,8 +7,15 @@
         <link rel="stylesheet" href="/static/style.css"/>
         <script>
             window.dalli_cfg = {
-                img: "{{url_for('custom_static', filename=img)}}"
+                img: "{{url_for('custom_static', filename=img)}}",
+                next: {{pageno}},
             };
+
+            document.addEventListener("DOMContentLoaded", function () {
+                if (window.dalli_cfg.next === null) {
+                    document.getElementById("btn-next").disabled = true;
+                }
+            });
         </script>
         <style>
             body {
@@ -22,7 +29,7 @@
             <canvas id="canvas"></canvas>
             <div id="toolbar">
                 <form method="get" action="/">
-                    <input type="hidden" name="image" value="{{pageno}}"/>
+                    <input type="hidden" id="next-image" name="image" value="{{ pageno }}"/>
                     <input type="submit" id="btn-next" value="N&auml;chstes Bild"/>
                 </form>
                 <button id="btn-hint">Freilegen</button>