⚡ Initial commit

js/jquery.sticky.js

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+// Sticky Plugin v1.0.3 for jQuery
+// =============
+// Author: Anthony Garand
+// Improvements by German M. Bravo (Kronuz) and Ruud Kamphuis (ruudk)
+// Improvements by Leonardo C. Daronco (daronco)
+// Created: 02/14/2011
+// Date: 07/20/2015
+// Website: http://stickyjs.com/
+// Description: Makes an element on the page stick on the screen as you scroll
+//              It will only set the 'top' and 'position' of your element, you
+//              might need to adjust the width in some cases.
+
+(function ($) {
+  var slice = Array.prototype.slice; // save ref to original slice()
+  var splice = Array.prototype.splice; // save ref to original slice()
+
+  var defaults = {
+      topSpacing: 0,
+      bottomSpacing: 0,
+      className: "is-sticky",
+      wrapperClassName: "sticky-wrapper",
+      center: false,
+      getWidthFrom: "",
+      widthFromWrapper: true, // works only when .getWidthFrom is empty
+      responsiveWidth: false,
+    },
+    $window = $(window),
+    $document = $(document),
+    sticked = [],
+    windowHeight = $window.height(),
+    scroller = function () {
+      var scrollTop = $window.scrollTop(),
+        documentHeight = $document.height(),
+        dwh = documentHeight - windowHeight,
+        extra = scrollTop > dwh ? dwh - scrollTop : 0;
+
+      for (var i = 0; i < sticked.length; i++) {
+        var s = sticked[i],
+          elementTop = s.stickyWrapper.offset().top,
+          etse = elementTop - s.topSpacing - extra;
+
+        //update height in case of dynamic content
+        s.stickyWrapper.css("height", s.stickyElement.outerHeight());
+
+        if (scrollTop <= etse) {
+          if (s.currentTop !== null) {
+            s.stickyElement.css({
+              width: "",
+              position: "",
+              top: "",
+            });
+            s.stickyElement.parent().removeClass(s.className);
+            s.stickyElement.trigger("sticky-end", [s]);
+            s.currentTop = null;
+          }
+        } else {
+          var newTop =
+            documentHeight -
+            s.stickyElement.outerHeight() -
+            s.topSpacing -
+            s.bottomSpacing -
+            scrollTop -
+            extra;
+          if (newTop < 0) {
+            newTop = newTop + s.topSpacing;
+          } else {
+            newTop = s.topSpacing;
+          }
+          if (s.currentTop != newTop) {
+            var newWidth;
+            if (s.getWidthFrom) {
+              newWidth = $(s.getWidthFrom).width() || null;
+            } else if (s.widthFromWrapper) {
+              newWidth = s.stickyWrapper.width();
+            }
+            if (newWidth == null) {
+              newWidth = s.stickyElement.width();
+            }
+            s.stickyElement
+              .css("width", newWidth)
+              .css("position", "fixed")
+              .css("top", newTop);
+
+            s.stickyElement.parent().addClass(s.className);
+
+            if (s.currentTop === null) {
+              s.stickyElement.trigger("sticky-start", [s]);
+            } else {
+              // sticky is started but it have to be repositioned
+              s.stickyElement.trigger("sticky-update", [s]);
+            }
+
+            if (
+              (s.currentTop === s.topSpacing && s.currentTop > newTop) ||
+              (s.currentTop === null && newTop < s.topSpacing)
+            ) {
+              // just reached bottom || just started to stick but bottom is already reached
+              s.stickyElement.trigger("sticky-bottom-reached", [s]);
+            } else if (
+              s.currentTop !== null &&
+              newTop === s.topSpacing &&
+              s.currentTop < newTop
+            ) {
+              // sticky is started && sticked at topSpacing && overflowing from top just finished
+              s.stickyElement.trigger("sticky-bottom-unreached", [s]);
+            }
+
+            s.currentTop = newTop;
+          }
+        }
+      }
+    },
+    resizer = function () {
+      windowHeight = $window.height();
+
+      for (var i = 0; i < sticked.length; i++) {
+        var s = sticked[i];
+        var newWidth = null;
+        if (s.getWidthFrom) {
+          if (s.responsiveWidth === true) {
+            newWidth = $(s.getWidthFrom).width();
+          }
+        } else if (s.widthFromWrapper) {
+          newWidth = s.stickyWrapper.width();
+        }
+        if (newWidth != null) {
+          s.stickyElement.css("width", newWidth);
+        }
+      }
+    },
+    methods = {
+      init: function (options) {
+        var o = $.extend({}, defaults, options);
+        return this.each(function () {
+          var stickyElement = $(this);
+
+          var stickyId = stickyElement.attr("id");
+          var stickyHeight = stickyElement.outerHeight();
+          var wrapperId = stickyId
+            ? stickyId + "-" + defaults.wrapperClassName
+            : defaults.wrapperClassName;
+          var wrapper = $("<div></div>")
+            .attr("id", wrapperId)
+            .addClass(o.wrapperClassName);
+
+          stickyElement.wrapAll(wrapper);
+
+          var stickyWrapper = stickyElement.parent();
+
+          if (o.center) {
+            stickyWrapper.css({
+              width: stickyElement.outerWidth(),
+              marginLeft: "auto",
+              marginRight: "auto",
+            });
+          }
+
+          if (stickyElement.css("float") == "right") {
+            stickyElement
+              .css({ float: "none" })
+              .parent()
+              .css({ float: "right" });
+          }
+
+          stickyWrapper.css("height", stickyHeight);
+
+          o.stickyElement = stickyElement;
+          o.stickyWrapper = stickyWrapper;
+          o.currentTop = null;
+
+          sticked.push(o);
+        });
+      },
+      update: scroller,
+      unstick: function (options) {
+        return this.each(function () {
+          var that = this;
+          var unstickyElement = $(that);
+
+          var removeIdx = -1;
+          var i = sticked.length;
+          while (i-- > 0) {
+            if (sticked[i].stickyElement.get(0) === that) {
+              splice.call(sticked, i, 1);
+              removeIdx = i;
+            }
+          }
+          if (removeIdx != -1) {
+            unstickyElement.unwrap();
+            unstickyElement.css({
+              width: "",
+              position: "",
+              top: "",
+              float: "",
+            });
+          }
+        });
+      },
+    };
+
+  // should be more efficient than using $window.scroll(scroller) and $window.resize(resizer):
+  if (window.addEventListener) {
+    window.addEventListener("scroll", scroller, false);
+    window.addEventListener("resize", resizer, false);
+  } else if (window.attachEvent) {
+    window.attachEvent("onscroll", scroller);
+    window.attachEvent("onresize", resizer);
+  }
+
+  $.fn.sticky = function (method) {
+    if (methods[method]) {
+      return methods[method].apply(this, slice.call(arguments, 1));
+    } else if (typeof method === "object" || !method) {
+      return methods.init.apply(this, arguments);
+    } else {
+      $.error("Method " + method + " does not exist on jQuery.sticky");
+    }
+  };
+
+  $.fn.unstick = function (method) {
+    if (methods[method]) {
+      return methods[method].apply(this, slice.call(arguments, 1));
+    } else if (typeof method === "object" || !method) {
+      return methods.unstick.apply(this, arguments);
+    } else {
+      $.error("Method " + method + " does not exist on jQuery.sticky");
+    }
+  };
+  $(function () {
+    setTimeout(scroller, 0);
+  });
+})(jQuery);
+
+$(document).ready(function () {
+  $(".navbar").sticky({ topSpacing: 0 });
+});