| // Sticky Plugin v1.0.4 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 (factory) { |
| if (typeof define === 'function' && define.amd) { |
| // AMD. Register as an anonymous module. |
| define(['jquery'], factory); |
| } else if (typeof module === 'object' && module.exports) { |
| // Node/CommonJS |
| module.exports = factory(require('jquery')); |
| } else { |
| // Browser globals |
| factory(jQuery); |
| } |
| }(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, |
| zIndex: 'inherit' |
| }, |
| $window = $(window), |
| $document = $(document), |
| $TableOfContents = $('#TableOfContents'), |
| 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, l = sticked.length; i < l; 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': '', |
| 'z-index': '' |
| }); |
| s.stickyElement.parent().removeClass(s.className); |
| $TableOfContents.removeClass('sticky'); |
| 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) { |
| padding = s.stickyElement.innerWidth() - s.stickyElement.width(); |
| newWidth = $(s.getWidthFrom).width() - padding || 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) |
| .css('z-index', s.zIndex); |
| |
| s.stickyElement.parent().addClass(s.className); |
| $TableOfContents.addClass('sticky') |
| |
| 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; |
| } |
| |
| // Check if sticky has reached end of container and stop sticking |
| var stickyWrapperContainer = s.stickyWrapper.parent(); |
| var unstick = (s.stickyElement.offset().top + s.stickyElement.outerHeight() >= stickyWrapperContainer.offset().top + stickyWrapperContainer.outerHeight()) && (s.stickyElement.offset().top <= s.topSpacing); |
| |
| if( unstick ) { |
| s.stickyElement |
| .css('position', 'absolute') |
| .css('top', '') |
| .css('bottom', 0) |
| .css('z-index', ''); |
| } else { |
| s.stickyElement |
| .css('position', 'fixed') |
| .css('top', newTop) |
| .css('bottom', '') |
| .css('z-index', s.zIndex); |
| } |
| } |
| } |
| }, |
| resizer = function() { |
| windowHeight = $window.height(); |
| |
| for (var i = 0, l = sticked.length; i < l; i++) { |
| var s = sticked[i]; |
| var newWidth = null; |
| if (s.getWidthFrom) { |
| if (s.responsiveWidth) { |
| newWidth = $(s.getWidthFrom).width(); |
| } |
| } else if(s.widthFromWrapper) { |
| newWidth = s.stickyWrapper.width(); |
| } |
| if (newWidth != null) { |
| s.stickyElement.css('width', newWidth); |
| } |
| } |
| }, |
| methods = { |
| init: function(options) { |
| return this.each(function() { |
| var o = $.extend({}, defaults, options); |
| var stickyElement = $(this); |
| |
| var stickyId = stickyElement.attr('id'); |
| var wrapperId = stickyId ? stickyId + '-' + defaults.wrapperClassName : defaults.wrapperClassName; |
| var wrapper = $('<div></div>') |
| .attr('id', wrapperId) |
| .addClass(o.wrapperClassName); |
| |
| stickyElement.wrapAll(function() { |
| if ($(this).parent("#" + wrapperId).length == 0) { |
| return 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"}); |
| } |
| |
| o.stickyElement = stickyElement; |
| o.stickyWrapper = stickyWrapper; |
| o.currentTop = null; |
| |
| sticked.push(o); |
| |
| methods.setWrapperHeight(this); |
| methods.setupChangeListeners(this); |
| }); |
| }, |
| |
| setWrapperHeight: function(stickyElement) { |
| var element = $(stickyElement); |
| var stickyWrapper = element.parent(); |
| if (stickyWrapper) { |
| stickyWrapper.css('height', element.outerHeight()); |
| } |
| }, |
| |
| setupChangeListeners: function(stickyElement) { |
| if (window.MutationObserver) { |
| var mutationObserver = new window.MutationObserver(function(mutations) { |
| if (mutations[0].addedNodes.length || mutations[0].removedNodes.length) { |
| methods.setWrapperHeight(stickyElement); |
| } |
| }); |
| mutationObserver.observe(stickyElement, {subtree: true, childList: true}); |
| } else { |
| if (window.addEventListener) { |
| stickyElement.addEventListener('DOMNodeInserted', function() { |
| methods.setWrapperHeight(stickyElement); |
| }, false); |
| stickyElement.addEventListener('DOMNodeRemoved', function() { |
| methods.setWrapperHeight(stickyElement); |
| }, false); |
| } else if (window.attachEvent) { |
| stickyElement.attachEvent('onDOMNodeInserted', function() { |
| methods.setWrapperHeight(stickyElement); |
| }); |
| stickyElement.attachEvent('onDOMNodeRemoved', function() { |
| methods.setWrapperHeight(stickyElement); |
| }); |
| } |
| } |
| }, |
| 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': '', |
| 'z-index': '' |
| }) |
| ; |
| } |
| }); |
| } |
| }; |
| |
| // 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); |
| }); |
| })); |