Add a closecomic callback to clear out the comfile session variable when a shown comic is closed

ajax/closecomic.php

@@ -0,0 +1,23 @@
+<?php
+
+require '../header.php';
+$validated = require_login(NOREDIRECT);
+
+$data = array();
+$data["error"] = false;
+$data["message"] = "";
+$data["validated"] = $validated;
+
+if ( !$validated ) {
+    $data["error"] = true;
+    $data["message"] = "Clients must validate accounts";
+    header('Content-Type: application/json');
+    echo json_encode($data);
+    exit();
+}
+
+$_SESSION['comfile'] = "";
+
+header('Content-Type: application/json');
+echo json_encode($data);
+exit();

js/comics.js

@@ -190,6 +190,27 @@ function updateCurrentPage() {
    });
 }
 
+//
+// This function hits the closecomic endpoint to clear out
+// the current comic in the session.
+//
+function closeComic() {
+   $.ajax({
+      url      : 'ajax/closecomic.php',
+      dataType : 'json',
+      success  : function(data, stat, jqo) {
+                    if ( !data.validated ) {
+                       redirectToLogin();
+                       return;
+                    }
+                 },
+      error    : function(xhr, stat, err) {
+                    console.log(xhr.status);
+                    console.log(err);
+      }
+   });
+}
+
 //
 // This JS function is called when a user clicks on a comic.
 // "showcomic.php" is called with the comic to view as a parameter.
@@ -211,7 +232,8 @@ function showComic(comic, name) {
                        items: data.images,
                        captions: data.captions,
                        startAt: data.startindex,
-                       beforeSetContent: updateCurrentPage
+                       beforeSetContent: updateCurrentPage,
+                       beforeClose: closeComic
                     });
                  },
       error    : function(xhr, stat, err) {