Add warning on camera feed disconnect

content/assets/scripts/cammie.js

@@ -26,6 +26,19 @@ debounce = function(func, wait, initial) {
 function cammie_error() {
 	$("#cammie-feed").attr("src","/assets/images/cammie_down.svg")
 }
+var cammieTimeout = null;
+function cammie_loaded() {
+  if (cammieTimeout) {
+    clearTimeout(cammieTimeout);
+  }
+  showWarning = function() {
+    if (!navigator.onLine) {
+      document.getElementById("cammieFeedDisconnected").textContent = "Lost connection to the server, reload the page to resume viewing";
+    }
+    document.getElementById("cammieFeedDisconnected").classList.remove("is-hidden");
+  };
+  cammieTimeout = setTimeout(showWarning, 5000);
+}
 
 $("#cammie-ctrls").mousemove(debounce(function() {
   return $(this).removeClass('display');

content/cammie.erb

@@ -16,9 +16,14 @@ socket.on('replymessage', function(obj) {
 <% end %>
 
 <section id="cammie-section">
+  <div id="cammieFeedDisconnected" class="notification is-danger is-light is-hidden">
+    Camera feed automatically disconnected due to inactivity, reload the page to resume viewing
+    <br>
+    Cammie is meant for checking if the kelder is busy before coming and shouldn't be left open for longer periods of time
+  </div>
   <div id="cammie-body">
     <figure class="image is-16by9">
-      <img id="cammie-feed" alt="cammie" src="https://kelder.zeus.ugent.be/camera/cammie" onerror="cammie_error()">
+      <img id="cammie-feed" alt="cammie" src="https://kelder.zeus.ugent.be/camera/cammie" onerror="cammie_error()" onload="cammie_loaded()">
     </figure>
     <div id="cammie-ctrls">
       <div class="columns is-mobile">