jquery.sticky-kit.js

// Generated by CoffeeScript 1.6.3
/**
@license Sticky-kit v1.0.3 | WTFPL | Leaf Corcoran 2013 | http://leafo.net
*/


(function() {
  var $, win;

  $ = this.jQuery;

  win = $(window);

  $.fn.stick_in_parent = function(opts) {
    var elm, inner_scrolling, offset_top, parent_selector, sticky_class, _fn, _i, _len;
    if (opts == null) {
      opts = {};
    }
    sticky_class = opts.sticky_class, inner_scrolling = opts.inner_scrolling, parent_selector = opts.parent, offset_top = opts.offset_top;
    if (offset_top == null) {
      offset_top = 0;
    }
    if (parent_selector == null) {
      parent_selector = void 0;
    }
    if (inner_scrolling == null) {
      inner_scrolling = true;
    }
    if (sticky_class == null) {
      sticky_class = "is_stuck";
    }
    _fn = function(elm, padding_bottom, parent_top, parent_height, top, height, el_float) {
      var bottomed, detach, fixed, last_pos, offset, parent, recalc, recalc_and_tick, spacer, tick;
      if (elm.data("sticky_kit")) {
        return;
      }
      elm.data("sticky_kit", true);
      parent = elm.parent();
      if (parent_selector != null) {
        parent = parent.closest(parent_selector);
      }
      if (!parent.length) {
        throw "failed to find stick parent";
      }
      fixed = false;
      spacer = $("<div />");
      recalc = function() {
        var border_top, padding_top, restore;
        border_top = parseInt(parent.css("border-top-width"), 10);
        padding_top = parseInt(parent.css("padding-top"), 10);
        padding_bottom = parseInt(parent.css("padding-bottom"), 10);
        parent_top = parent.offset().top + border_top + padding_top;
        parent_height = parent.height();
        restore = fixed ? (fixed = false, elm.insertAfter(spacer).css({
          position: "",
          top: "",
          width: ""
        }), spacer.detach(), true) : void 0;
        top = elm.offset().top - parseInt(elm.css("margin-top"), 10) - offset_top;
        height = elm.outerHeight(true);
        el_float = elm.css("float");
        spacer.css({
          width: elm.outerWidth(true),
          height: height,
          display: elm.css("display"),
          "vertical-align": elm.css("vertical-align"),
          float: el_float
        });
        if (restore) {
          return tick();
        }
      };
      recalc();
      if (height === parent_height) {
        return;
      }
      bottomed = false;
      last_pos = void 0;
      offset = offset_top;
      tick = function() {
        var css, delta, scroll, will_bottom, win_height;
        scroll = win.scrollTop();
        if (last_pos != null) {
          delta = scroll - last_pos;
        }
        last_pos = scroll;
        if (fixed) {
          will_bottom = scroll + height + offset > parent_height + parent_top;
          if (bottomed && !will_bottom) {
            bottomed = false;
            elm.css({
              position: "fixed",
              bottom: "",
              top: offset
            }).trigger("sticky_kit:unbottom");
          }
          if (scroll < top) {
            fixed = false;
            offset = offset_top;
            if (el_float === "left" || el_float === "right") {
              elm.insertAfter(spacer);
            }
            spacer.detach();
            css = {
              position: "",
              width: "",
              top: ""
            };
            elm.css(css).removeClass(sticky_class).trigger("sticky_kit:unstick");
          }
          if (inner_scrolling) {
            win_height = win.height();
            if (height > win_height) {
              if (!bottomed) {
                offset -= delta;
                offset = Math.max(win_height - height, offset);
                offset = Math.min(offset_top, offset);
                if (fixed) {
                  elm.css({
                    top: offset + "px"
                  });
                }
              }
            }
          }
        } else {
          if (scroll > top) {
            fixed = true;
            css = {
              position: "fixed",
              top: offset
            };
            css.width = elm.width() + "px";
            elm.css(css).addClass(sticky_class).after(spacer);
            if (el_float === "left" || el_float === "right") {
              spacer.append(elm);
            }
            elm.trigger("sticky_kit:stick");
          }
        }
        if (fixed) {
          if (will_bottom == null) {
            will_bottom = scroll + height + offset > parent_height + parent_top;
          }
          if (!bottomed && will_bottom) {
            bottomed = true;
            if (parent.css("position") === "static") {
              parent.css({
                position: "relative"
              });
            }
            return elm.css({
              position: "absolute",
              bottom: padding_bottom,
              top: ""
            }).trigger("sticky_kit:bottom");
          }
        }
      };
      recalc_and_tick = function() {
        recalc();
        return tick();
      };
      detach = function() {
        win.off("scroll", tick);
        $(document.body).off("sticky_kit:recalc", recalc_and_tick);
        elm.off("sticky_kit:detach", detach);
        elm.removeData("sticky_kit");
        elm.css({
          position: "",
          bottom: "",
          top: ""
        });
        parent.position("position", "");
        if (fixed) {
          elm.insertAfter(spacer).removeClass(sticky_class);
          return spacer.remove();
        }
      };
      win.on("scroll", tick);
      win.on("resize", recalc_and_tick);
      $(document.body).on("sticky_kit:recalc", recalc_and_tick);
      elm.on("sticky_kit:detach", detach);
      return setTimeout(tick, 0);
    };
    for (_i = 0, _len = this.length; _i < _len; _i++) {
      elm = this[_i];
      _fn($(elm));
    }
    return this;
  };

}).call(this);