Improve JS code style.

assets/js/_commons/back-to-top.js

@@ -3,16 +3,16 @@ Reference: https://bootsnipp.com/snippets/featured/link-to-top-page
 */
 $(window).scroll(function() {
   if ($(this).scrollTop() > 50
-      && $('#sidebar-trigger').css('display') == 'none') {
-    $('#back-to-top').fadeIn();
+      && $("#sidebar-trigger").css("display") === "none") {
+    $("#back-to-top").fadeIn();
   } else {
-    $('#back-to-top').fadeOut();
+    $("#back-to-top").fadeOut();
   }
 });
 
 $(function() {
-  $('#back-to-top').click(function() {
-    $('body,html').animate({scrollTop: 0}, 800);
+  $("#back-to-top").click(function() {
+    $("body,html").animate({scrollTop: 0}, 800);
     return false;
   });
 });

assets/js/_commons/copy-link.js

@@ -1,13 +1,16 @@
 /*
-* Copy current page url to clipboard.
-* v2.1
-* https://github.com/cotes2020/jekyll-theme-chirpy
-* © 2020 Cotes Chung
-* MIT License
-*/
+ * Copy current page url to clipboard.
+ * v2.1
+ * https://github.com/cotes2020/jekyll-theme-chirpy
+ * © 2020 Cotes Chung
+ * MIT License
+ */
 
 function copyLink(url) {
-  if (!url || 0 === url.length)
+  if (!url || 0 === url.length) {
+    return;
+  }
+
   url = window.location.href;
   var $temp = $("<input>");
 
@@ -17,4 +20,5 @@ function copyLink(url) {
   $temp.remove();
 
   alert("Link copied successfully!");
+
 }

assets/js/_commons/search-display.js

@@ -8,18 +8,18 @@
 
 $(function() {
 
-  var btnSbTrigger = $('#sidebar-trigger');
-  var btnSearchTrigger = $('#search-trigger');
-  var btnCancel = $('#search-cancel');
-  var btnClear = $('#search-cleaner');
+  var btnSbTrigger = $("#sidebar-trigger");
+  var btnSearchTrigger = $("#search-trigger");
+  var btnCancel = $("#search-cancel");
+  var btnClear = $("#search-cleaner");
 
-  var main = $('#main');
-  var topbarTitle = $('#topbar-title');
-  var searchWrapper = $('#search-wrapper');
-  var resultWrapper = $('#search-result-wrapper');
-  var results = $('#search-results');
-  var input = $('#search-input');
-  var hints = $('#search-hints');
+  var main = $("#main");
+  var topbarTitle = $("#topbar-title");
+  var searchWrapper = $("#search-wrapper");
+  var resultWrapper = $("#search-result-wrapper");
+  var results = $("#search-results");
+  var input = $("#search-input");
+  var hints = $("#search-hints");
 
 
   /*--- Actions in small screens (Sidebar unloaded) ---*/
@@ -27,75 +27,76 @@ $(function() {
   var scrollBlocker = (function() {
     var offset = 0;
     return {
-      block: function() {
+      block() {
         offset = $(window).scrollTop();
       },
-      release: function() {
-        $('html,body').scrollTop(offset);
+      release() {
+        $("html,body").scrollTop(offset);
       },
-      getOffset: function() {
+      getOffset() {
         return offset;
       }
-    }
-  })();
+    };
+  }());
 
   var mobileSearchBar = (function() {
     return {
-      on: function() {
-        btnSbTrigger.addClass('unloaded');
-        topbarTitle.addClass('unloaded');
-        btnSearchTrigger.addClass('unloaded');
-        searchWrapper.addClass('d-flex');
-        btnCancel.addClass('loaded');
+      on() {
+        btnSbTrigger.addClass("unloaded");
+        topbarTitle.addClass("unloaded");
+        btnSearchTrigger.addClass("unloaded");
+        searchWrapper.addClass("d-flex");
+        btnCancel.addClass("loaded");
       },
-      off: function() {
-        btnCancel.removeClass('loaded');
-        searchWrapper.removeClass('d-flex');
-        btnSbTrigger.removeClass('unloaded');
-        topbarTitle.removeClass('unloaded');
-        btnSearchTrigger.removeClass('unloaded');
+      off() {
+        btnCancel.removeClass("loaded");
+        searchWrapper.removeClass("d-flex");
+        btnSbTrigger.removeClass("unloaded");
+        topbarTitle.removeClass("unloaded");
+        btnSearchTrigger.removeClass("unloaded");
       }
-    }
-  })();
+    };
+  }());
 
   var resultSwitch = (function() {
     var visable = false;
 
     return {
-      on: function() {
+      on() {
         if (!visable) {
-          resultWrapper.removeClass('unloaded');
-          main.addClass('hidden');
+          resultWrapper.removeClass("unloaded");
+          main.addClass("hidden");
 
           visable = true;
           scrollBlocker.block();
         }
       },
-      off: function() {
+      off() {
         if (visable) {
           results.empty();
-          if (hints.hasClass('unloaded')) {
-            hints.removeClass('unloaded');
+          if (hints.hasClass("unloaded")) {
+            hints.removeClass("unloaded");
           }
-          resultWrapper.addClass('unloaded');
-          btnClear.removeClass('visable');
-          main.removeClass('hidden');
+          resultWrapper.addClass("unloaded");
+          btnClear.removeClass("visable");
+          main.removeClass("hidden");
 
-          input.val('');
+          input.val("");
           visable = false;
 
           scrollBlocker.release();
         }
       },
-      isVisable: function() {
+      isVisable() {
         return visable;
       }
-    }
-  })();
+    };
+
+  }());
 
 
   function isMobileView() {
-    return btnCancel.hasClass('loaded');
+    return btnCancel.hasClass("loaded");
   }
 
   btnSearchTrigger.click(function() {
@@ -110,45 +111,45 @@ $(function() {
   });
 
   input.focus(function() {
-    searchWrapper.addClass('input-focus');
+    searchWrapper.addClass("input-focus");
   });
 
   input.focusout(function() {
-    searchWrapper.removeClass('input-focus');
+    searchWrapper.removeClass("input-focus");
   });
 
-  input.on('keyup', function(e) {
-    if (e.keyCode == 8 && input.val() == '') {
+  input.on("keyup", function(e) {
+    if (e.keyCode === 8 && input.val() === "") {
       if (!isMobileView()) {
         resultSwitch.off();
       } else {
-        hints.removeClass('unloaded');
+        hints.removeClass("unloaded");
       }
     } else {
-      if (input.val() != '') {
+      if (input.val() !== "") {
         resultSwitch.on();
 
-        if (!btnClear.hasClass('visible')) {
-          btnClear.addClass('visable');
+        if (!btnClear.hasClass("visible")) {
+          btnClear.addClass("visable");
         }
 
         if (isMobileView()) {
-          hints.addClass('unloaded');
+          hints.addClass("unloaded");
         }
       }
     }
   });
 
-  btnClear.on('click', function() {
-    input.val('');
+  btnClear.on("click", function() {
+    input.val("");
     if (isMobileView()) {
-      hints.removeClass('unloaded');
+      hints.removeClass("unloaded");
       results.empty();
     } else {
       resultSwitch.off();
     }
     input.focus();
-    btnClear.removeClass('visable');
+    btnClear.removeClass("visable");
   });
 
-});
+});

assets/js/_commons/sidebar.js

@@ -11,24 +11,24 @@ $(function() {
   var sidebarUtil = (function() {
     const ATTR_DISPLAY = "sidebar-display";
     var isExpanded = false;
-    var body = $('body');
+    var body = $("body");
 
     return {
-      toggle: function() {
-        if (isExpanded == false) {
-          body.attr(ATTR_DISPLAY, '');
+      toggle() {
+        if (isExpanded === false) {
+          body.attr(ATTR_DISPLAY, "");
         } else {
           body.removeAttr(ATTR_DISPLAY);
         }
 
         isExpanded = !isExpanded;
       }
-    }
+    };
 
-  })();
+  }());
 
   $("#sidebar-trigger").click(sidebarUtil.toggle);
 
-  $('#mask').click(sidebarUtil.toggle);
+  $("#mask").click(sidebarUtil.toggle);
 
 });

assets/js/_commons/topbar-switch.js

@@ -11,7 +11,47 @@ $(function() {
   var didScroll;
   var lastScrollTop = 0;
   var delta = 5;
-  var topbarHeight = $('#topbar-wrapper').outerHeight();
+  var topbarHeight = $("#topbar-wrapper").outerHeight();
+
+  function hasScrolled() {
+    var st = $(this).scrollTop();
+
+    /* Make sure they scroll more than delta */
+    if (Math.abs(lastScrollTop - st) <= delta) {
+      return;
+    }
+
+    if (st > lastScrollTop && st > topbarHeight) {
+      /* Scroll Down */
+      $("#topbar-wrapper").removeClass("topbar-down").addClass("topbar-up");
+
+      if ($("#toc-wrapper").length > 0) {
+        $("#toc-wrapper").removeClass("topbar-down");
+      }
+
+      if ($(".access").length > 0) {
+        $(".access").removeClass("topbar-down");
+      }
+
+      if ($("#search-input").is(":focus")) {
+        $("#search-input").blur(); /* remove focus */
+      }
+
+    } else {
+      /* Scroll Up */
+      if (st + $(window).height() < $(document).height()) {
+        $("#topbar-wrapper").removeClass("topbar-up").addClass("topbar-down");
+        if ($("#toc-wrapper").length > 0) {
+          $("#toc-wrapper").addClass("topbar-down");
+        }
+        if ($(".access").length > 0) {
+          $(".access").addClass("topbar-down");
+        }
+      }
+    }
+
+    lastScrollTop = st;
+  }
 
   $(window).scroll(function(event) {
     if ($("#topbar-title").is(":hidden")) { /* Not in small screens */
@@ -26,42 +66,4 @@ $(function() {
     }
   }, 250);
 
-  function hasScrolled() {
-    var st = $(this).scrollTop();
-
-    /* Make sure they scroll more than delta */
-    if (Math.abs(lastScrollTop - st) <= delta)
-      return;
-
-    if (st > lastScrollTop && st > topbarHeight) {
-      /* Scroll Down */
-      $('#topbar-wrapper').removeClass('topbar-down').addClass('topbar-up');
-
-      if ( $('#toc-wrapper').length > 0) {
-        $('#toc-wrapper').removeClass('topbar-down');
-      }
-
-      if ( $('.access').length > 0) {
-        $('.access').removeClass('topbar-down');
-      }
-
-      if ($('#search-input').is(':focus')) {
-        $('#search-input').blur(); /* remove focus */
-      }
-
-    } else {
-      /* Scroll Up */
-      if (st + $(window).height() < $(document).height()) {
-        $('#topbar-wrapper').removeClass('topbar-up').addClass('topbar-down');
-        if ( $('#toc-wrapper').length > 0) {
-          $('#toc-wrapper').addClass('topbar-down');
-        }
-        if ( $('.access').length > 0) {
-          $('.access').addClass('topbar-down');
-        }
-      }
-    }
-
-    lastScrollTop = st;
-  }
 });

assets/js/_commons/topbar-title.js

@@ -13,9 +13,9 @@ $(function() {
           $("div.post>h1").text().trim() : $("h1").text().trim();
 
   if ($("#page-category").length || $("#page-tag").length) {
-    /* The title in Category or Tag page will be '<title> <count_of_posts>' */
+    /* The title in Category or Tag page will be "<title> <count_of_posts>" */
     if (/\s/.test(title)) {
-      title = title.replace(/[0-9]/g, '').trim();
+      title = title.replace(/[0-9]/g, "").trim();
     }
   }
 
@@ -29,19 +29,19 @@ $(function() {
     }
 
     if ($(this).scrollTop() >= 95) {
-      if ($("#topbar-title").text() != title) {
+      if ($("#topbar-title").text() !== title) {
         $("#topbar-title").text(title);
       }
     } else {
-      if ($("#topbar-title").text() != DEFAULT) {
+      if ($("#topbar-title").text() !== DEFAULT) {
         $("#topbar-title").text(DEFAULT);
       }
     }
   });
 
   /* Click title remove hover effect. */
-  $('#topbar-title').click(function() {
-    $('body,html').animate({scrollTop: 0}, 800);
+  $("#topbar-title").click(function() {
+    $("body,html").animate({scrollTop: 0}, 800);
   });
 
 });