Extract bookmark / save_scroll to plugins

_config.yml

@@ -278,9 +278,6 @@ chat:
 # Automatically scroll page to section which is under <!-- more --> mark.
 scroll_to_more: true
 
-# Automatically saving scroll position of each page in the browser.
-save_scroll: false
-
 # Automatically excerpt description in homepage as preamble text.
 excerpt_description: true
 
@@ -586,14 +583,6 @@ quicklink:
   # See: https://github.com/GoogleChromeLabs/quicklink#custom-ignore-patterns
   ignores:
 
-# Bookmark Support
-# Dependencies: https://github.com/theme-next/theme-next-bookmark
-bookmark:
-  enable: false
-  # If auto, save the reading position when closing the page or clicking the bookmark-icon.
-  # If manual, only save it by clicking the bookmark-icon.
-  save: auto
-
 
 # ---------------------------------------------------------------
 # Comments and Widgets
@@ -1078,11 +1067,6 @@ vendors:
   # quicklink: //cdn.jsdelivr.net/npm/quicklink@1/dist/quicklink.umd.js
   quicklink:
 
-  # Internal version: 1.0.0
-  # Example:
-  # bookmark: //cdn.jsdelivr.net/gh/theme-next/theme-next-bookmark@1/bookmark.min.js
-  bookmark:
-
   # DisqusJS
   # Example:
   # disqusjs_js: //cdn.jsdelivr.net/npm/disqusjs@1/dist/disqus.js

layout/_partials/head/head.swig

@@ -84,7 +84,6 @@
     exturl: {{ theme.exturl }},
     sidebar: {{ theme.sidebar | json_encode }},
     back2top: {{ theme.back2top | json_encode }},
-    save_scroll: {{ theme.save_scroll }},
     copycode: {{ theme.codeblock.copy_button | json_encode }},
     fancybox: {{ theme.fancybox }},
     mediumzoom: {{ theme.mediumzoom }},

layout/_partials/pjax.swig

@@ -11,12 +11,10 @@ var pjax = new Pjax({
     '.sidebar-inner': Pjax.switches.innerHTML
   },
   analytics: false,
-  cacheBust: false,
-  scrollTo: !CONFIG.save_scroll
+  cacheBust: false
 });
 window.addEventListener('pjax:send', () => {
   $('.sidebar-inner').stop().fadeTo('fast', 0);
-  CONFIG.save_scroll && clearInterval(NexT.utils.saveScrollTimer);
 });
 window.addEventListener('pjax:success', () => {
   document.querySelectorAll('script[pjax], script#page-configurations, #pjax script').forEach(element => {

layout/_third-party/index.swig

@@ -1,5 +1,4 @@
 {% include 'baidu-push.swig' %}
-{% include 'bookmark.swig' %}
 
 {% include 'analytics/analytics-with-jquery.swig' %}
 {% include 'facebook-sdk.swig' %}

source/js/next-boot.js

@@ -33,16 +33,6 @@ window.addEventListener('DOMContentLoaded', () => {
 
 $(document).on('DOMContentLoaded pjax:success', () => {
 
-  if (CONFIG.save_scroll) {
-    // Read position from localStorage
-    var value = localStorage.getItem('scroll' + location.pathname);
-    $('html, body').animate({ scrollTop: value || 0 });
-    // Write position in localStorage
-    NexT.utils.saveScrollTimer = setInterval(() => {
-      localStorage.setItem('scroll' + location.pathname, window.scrollY);
-    }, 1000);
-  }
-
   /**
    * Register JS handlers by condition option.
    * Need to add config option in Front-End at 'layout/_partials/head.swig' file.

source/js/utils.js

@@ -90,7 +90,7 @@ NexT.utils = {
           return element.innerText;
         }).join('\n');
         var ta = document.createElement('textarea');
-        var yPosition = window.pageYOffset || document.documentElement.scrollTop;
+        var yPosition = window.scrollY;
         ta.style.top = yPosition + 'px'; // Prevent page scroll
         ta.style.position = 'absolute';
         ta.style.opacity = '0';
@@ -135,7 +135,7 @@ NexT.utils = {
         scrollPercent = NexT.utils.getScrollPercent();
       }
       if (backToTop) {
-        $(backToTop).toggleClass('back-to-top-on', window.pageYOffset > THRESHOLD);
+        $(backToTop).toggleClass('back-to-top-on', window.scrollY > THRESHOLD);
         document.querySelector('#scrollpercent span').innerText = scrollPercent;
       }
       if (readingProgressBar) {