From 3d8ae2e7438a8895582bc372816094c644ecddbd Mon Sep 17 00:00:00 2001
From: Peter Wu <peter@lekensteyn.nl>
Date: Wed, 8 Apr 2015 10:05:16 +0200
Subject: Fix anchor focussing and page navigation

---
 js/curriculum.js |  4 ++--
 js/main.js       | 35 +++++++++++++++++++++++++++--------
 2 files changed, 29 insertions(+), 10 deletions(-)

(limited to 'js')

diff --git a/js/curriculum.js b/js/curriculum.js
index 164ff3b..9b35cc4 100644
--- a/js/curriculum.js
+++ b/js/curriculum.js
@@ -44,7 +44,7 @@ define(['courses'], function(courses) {
             // display link for courses which have a description block
             if (course.id) {
                 var link = document.createElement('a');
-                link.href = '#!/curriculum/' + course.id;
+                link.href = '#/curriculum/' + course.id;
                 link.textContent = course.name;
                 course_item.appendChild(link);
             } else {
@@ -56,7 +56,7 @@ define(['courses'], function(courses) {
         courses.courses.forEach(function(course) {
             var header = document.createElement('h2');
             //header.id = 'course-' + course.id;
-            header.id = '!/curriculum/' + course.id;
+            header.id = '/curriculum/' + course.id;
             header.textContent = course.name + ' (' + course.when + ')';
             citems.appendChild(header);
 
diff --git a/js/main.js b/js/main.js
index 66d5be4..d37c228 100644
--- a/js/main.js
+++ b/js/main.js
@@ -29,33 +29,52 @@ define(function() {
     }
 
     /* tries to navigate to a page */
-    function selectPage(page) {
+    var current_page;
+    function selectPage(page, anchor) {
         if (all_pages.indexOf(page) == -1) {
             // TODO: 404
             console.log("404 " + page);
             return false;
         }
+
+        if (current_page === page) {
+            return;
+        }
+        current_page = page;
+
         console.log("Loading " + page);
         var http = new XMLHttpRequest();
         http.onload = function() {
             loadContent(page, http.responseText);
+
+            // focus element when loaded
+            var anchor_id = /^#(.+)/.exec(anchor);
+            if (anchor_id) {
+                var selection = document.getElementById(anchor_id[1]);
+                if (selection) {
+                    selection.scrollIntoView();
+                }
+            }
         };
         http.open('get', 'pages/' + page + '.html' + cacheBuster);
         http.send(null);
         return true;
     }
 
-    addEventListener('hashchange', function(ev) {
-        var m = /#\/(.+)/.exec(ev.newURL);
+    function changePageHash(hash) {
+        var m = /#\/([^\/]+)/.exec(hash);
         if (m) {
-            selectPage(m[1]);
-        } else if (!/#/.test(ev.newURL)) {
+            selectPage(m[1], hash);
+        } else {
             location.hash = '#/home';
+            selectPage('home', hash);
         }
+    }
+
+    addEventListener('hashchange', function(ev) {
+        changePageHash(ev.newURL);
     });
 
     // Tries to load the current page, falling back to "home" for unknown URLs.
-    if (!selectPage(location.hash.replace(/^#\//, ''))) {
-        location.hash = '#/home';
-    }
+    changePageHash(location.hash);
 });
-- 
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