filenames

use kebab-case for file names
remove camelCase and snake_case

website/agenda/planung/js/page-leave-handler.js

@@ -0,0 +1,35 @@
+var pageHasChangedCounter=0;
+var pageIsLoaded=0;
+
+function pageHasChanged(){
+    console.log("pageHasChanged="+pageHasChangedCounter)
+    if (pageIsLoaded==0) return;
+    pageHasChangedCounter++;
+    console.log("pageHasChanged="+pageHasChangedCounter)
+}
+
+function confirmPageLeave(){
+     if(pageHasChangedCounter==0) return null;
+     return "Unsaved changed! Continue?";
+}
+
+function pageLeaveHandler(){
+    $('div.editor input'   ).change(function(){pageHasChanged()});
+    $('div.editor textarea').change(function(){pageHasChanged()});
+    $('div.editor select'  ).change(function(){pageHasChanged()});
+ 
+    window.onbeforeunload = function() {
+        return confirmPageLeave();
+    };
+
+    //$(window).unload(function(){});
+    pageIsLoaded=1;
+    console.log("pageLeaveHandler=initialized")
+
+}
+
+function leavePage(){
+    pageHasChangedCounter=0;
+    console.log("leavePage")
+    return 1;
+}