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+// Sticky Plugin v1.0.4 for jQuery
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+// =============
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+// Author: Anthony Garand
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+// Improvements by German M. Bravo (Kronuz) and Ruud Kamphuis (ruudk)
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+// Improvements by Leonardo C. Daronco (daronco)
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+// Created: 02/14/2011
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+// Date: 07/20/2015
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+// Website: http://stickyjs.com/
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+// Description: Makes an element on the page stick on the screen as you scroll
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+// It will only set the 'top' and 'position' of your element, you
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+// might need to adjust the width in some cases.
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+
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+(function (factory) {
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+ if (typeof define === 'function' && define.amd) {
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+ // AMD. Register as an anonymous module.
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+ define(['jquery'], factory);
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+ } else if (typeof module === 'object' && module.exports) {
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+ // Node/CommonJS
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+ module.exports = factory(require('jquery'));
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+ } else {
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+ // Browser globals
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+ factory(jQuery);
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+ }
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+}(function ($) {
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+ var slice = Array.prototype.slice; // save ref to original slice()
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+ var splice = Array.prototype.splice; // save ref to original slice()
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+
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+ var defaults = {
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+ topSpacing: 0,
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+ bottomSpacing: 0,
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+ className: 'is-sticky',
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+ wrapperClassName: 'sticky-wrapper',
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+ center: false,
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+ getWidthFrom: '',
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+ widthFromWrapper: true, // works only when .getWidthFrom is empty
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+ responsiveWidth: false,
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+ zIndex: 'inherit'
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+ },
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+ $window = $(window),
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+ $document = $(document),
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+ sticked = [],
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+ windowHeight = $window.height(),
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+ scroller = function() {
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+ var scrollTop = $window.scrollTop(),
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+ documentHeight = $document.height(),
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+ dwh = documentHeight - windowHeight,
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+ extra = (scrollTop > dwh) ? dwh - scrollTop : 0;
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+
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+ for (var i = 0, l = sticked.length; i < l; i++) {
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+ var s = sticked[i],
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+ elementTop = s.stickyWrapper.offset().top,
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+ etse = elementTop - s.topSpacing - extra;
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+
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+ //update height in case of dynamic content
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+ s.stickyWrapper.css('height', s.stickyElement.outerHeight());
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+
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+ if (scrollTop <= etse) {
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+ if (s.currentTop !== null) {
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+ s.stickyElement
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+ .css({
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+ 'width': '',
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+ 'position': '',
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+ 'top': '',
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+ 'z-index': ''
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+ });
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+ s.stickyElement.parent().removeClass(s.className);
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+ s.stickyElement.trigger('sticky-end', [s]);
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+ s.currentTop = null;
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+ }
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+ }
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+ else {
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+ var newTop = documentHeight - s.stickyElement.outerHeight()
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+ - s.topSpacing - s.bottomSpacing - scrollTop - extra;
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+ if (newTop < 0) {
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+ newTop = newTop + s.topSpacing;
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+ } else {
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+ newTop = s.topSpacing;
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+ }
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+ if (s.currentTop !== newTop) {
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+ var newWidth;
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+ if (s.getWidthFrom) {
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+ padding = s.stickyElement.innerWidth() - s.stickyElement.width();
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+ newWidth = $(s.getWidthFrom).width() - padding || null;
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+ } else if (s.widthFromWrapper) {
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+ newWidth = s.stickyWrapper.width();
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+ }
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+ if (newWidth == null) {
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+ newWidth = s.stickyElement.width();
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+ }
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+ s.stickyElement
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+ .css('width', newWidth)
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+ .css('position', 'fixed')
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+ .css('top', newTop)
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+ .css('z-index', s.zIndex);
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+
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+ s.stickyElement.parent().addClass(s.className);
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+
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+ if (s.currentTop === null) {
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+ s.stickyElement.trigger('sticky-start', [s]);
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+ } else {
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+ // sticky is started but it have to be repositioned
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+ s.stickyElement.trigger('sticky-update', [s]);
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+ }
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+
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+ if (s.currentTop === s.topSpacing && s.currentTop > newTop || s.currentTop === null && newTop < s.topSpacing) {
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+ // just reached bottom || just started to stick but bottom is already reached
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+ s.stickyElement.trigger('sticky-bottom-reached', [s]);
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+ } else if(s.currentTop !== null && newTop === s.topSpacing && s.currentTop < newTop) {
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+ // sticky is started && sticked at topSpacing && overflowing from top just finished
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+ s.stickyElement.trigger('sticky-bottom-unreached', [s]);
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+ }
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+
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+ s.currentTop = newTop;
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+ }
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+
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+ // Check if sticky has reached end of container and stop sticking
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+ var stickyWrapperContainer = s.stickyWrapper.parent();
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+ var unstick = (s.stickyElement.offset().top + s.stickyElement.outerHeight() >= stickyWrapperContainer.offset().top + stickyWrapperContainer.outerHeight()) && (s.stickyElement.offset().top <= s.topSpacing);
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+
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+ if( unstick ) {
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+ s.stickyElement
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+ .css('position', 'absolute')
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+ .css('top', '')
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+ .css('bottom', 0)
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+ .css('z-index', '');
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+ } else {
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+ s.stickyElement
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+ .css('position', 'fixed')
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+ .css('top', newTop)
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+ .css('bottom', '')
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+ .css('z-index', s.zIndex);
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+ }
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+ }
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+ }
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+ },
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+ resizer = function() {
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+ windowHeight = $window.height();
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+
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+ for (var i = 0, l = sticked.length; i < l; i++) {
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+ var s = sticked[i];
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+ var newWidth = null;
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+ if (s.getWidthFrom) {
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+ if (s.responsiveWidth) {
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+ newWidth = $(s.getWidthFrom).width();
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+ }
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+ } else if(s.widthFromWrapper) {
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+ newWidth = s.stickyWrapper.width();
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+ }
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+ if (newWidth != null) {
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+ s.stickyElement.css('width', newWidth);
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+ }
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+ }
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+ },
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+ methods = {
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+ init: function(options) {
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+ return this.each(function() {
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+ var o = $.extend({}, defaults, options);
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+ var stickyElement = $(this);
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+
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+ var stickyId = stickyElement.attr('id');
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+ var wrapperId = stickyId ? stickyId + '-' + defaults.wrapperClassName : defaults.wrapperClassName;
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+ var wrapper = $('<div></div>')
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+ .attr('id', wrapperId)
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+ .addClass(o.wrapperClassName);
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+
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+ stickyElement.wrapAll(function() {
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+ if ($(this).parent("#" + wrapperId).length == 0) {
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+ return wrapper;
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+ }
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+});
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+
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+ var stickyWrapper = stickyElement.parent();
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+
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+ if (o.center) {
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+ stickyWrapper.css({width:stickyElement.outerWidth(),marginLeft:"auto",marginRight:"auto"});
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+ }
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+
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+ if (stickyElement.css("float") === "right") {
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+ stickyElement.css({"float":"none"}).parent().css({"float":"right"});
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+ }
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+
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+ o.stickyElement = stickyElement;
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+ o.stickyWrapper = stickyWrapper;
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+ o.currentTop = null;
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+
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+ sticked.push(o);
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+
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+ methods.setWrapperHeight(this);
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+ methods.setupChangeListeners(this);
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+ });
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+ },
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+
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+ setWrapperHeight: function(stickyElement) {
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+ var element = $(stickyElement);
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+ var stickyWrapper = element.parent();
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+ if (stickyWrapper) {
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+ stickyWrapper.css('height', element.outerHeight());
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+ }
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+ },
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+
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+ setupChangeListeners: function(stickyElement) {
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+ if (window.MutationObserver) {
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+ var mutationObserver = new window.MutationObserver(function(mutations) {
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+ if (mutations[0].addedNodes.length || mutations[0].removedNodes.length) {
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+ methods.setWrapperHeight(stickyElement);
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+ }
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+ });
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+ mutationObserver.observe(stickyElement, {subtree: true, childList: true});
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+ } else {
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+ if (window.addEventListener) {
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+ stickyElement.addEventListener('DOMNodeInserted', function() {
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+ methods.setWrapperHeight(stickyElement);
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+ }, false);
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+ stickyElement.addEventListener('DOMNodeRemoved', function() {
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+ methods.setWrapperHeight(stickyElement);
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+ }, false);
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+ } else if (window.attachEvent) {
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+ stickyElement.attachEvent('onDOMNodeInserted', function() {
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+ methods.setWrapperHeight(stickyElement);
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+ });
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+ stickyElement.attachEvent('onDOMNodeRemoved', function() {
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+ methods.setWrapperHeight(stickyElement);
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+ });
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+ }
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+ }
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+ },
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+ update: scroller,
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+ unstick: function(options) {
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+ return this.each(function() {
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+ var that = this;
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+ var unstickyElement = $(that);
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+
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+ var removeIdx = -1;
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+ var i = sticked.length;
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+ while (i-- > 0) {
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+ if (sticked[i].stickyElement.get(0) === that) {
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+ splice.call(sticked,i,1);
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+ removeIdx = i;
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+ }
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+ }
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+ if(removeIdx !== -1) {
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+ unstickyElement.unwrap();
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+ unstickyElement
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+ .css({
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+ 'width': '',
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+ 'position': '',
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+ 'top': '',
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+ 'float': '',
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+ 'z-index': ''
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+ })
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+ ;
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+ }
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+ });
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+ }
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+ };
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+
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+ // should be more efficient than using $window.scroll(scroller) and $window.resize(resizer):
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+ if (window.addEventListener) {
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+ window.addEventListener('scroll', scroller, false);
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+ window.addEventListener('resize', resizer, false);
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+ } else if (window.attachEvent) {
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+ window.attachEvent('onscroll', scroller);
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+ window.attachEvent('onresize', resizer);
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+ }
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+
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+ $.fn.sticky = function(method) {
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+ if (methods[method]) {
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+ return methods[method].apply(this, slice.call(arguments, 1));
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+ } else if (typeof method === 'object' || !method ) {
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+ return methods.init.apply( this, arguments );
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+ } else {
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+ $.error('Method ' + method + ' does not exist on jQuery.sticky');
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+ }
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+ };
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+
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+ $.fn.unstick = function(method) {
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+ if (methods[method]) {
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+ return methods[method].apply(this, slice.call(arguments, 1));
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+ } else if (typeof method === 'object' || !method ) {
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+ return methods.unstick.apply( this, arguments );
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+ } else {
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+ $.error('Method ' + method + ' does not exist on jQuery.sticky');
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+ }
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+ };
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+ $(function() {
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+ setTimeout(scroller, 0);
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+ });
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+}));
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