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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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(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 ($) { |
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var slice = Array.prototype.slice; // save ref to original slice()
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var splice = Array.prototype.splice; // save ref to original slice()
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var defaults = { |
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topSpacing: 0, |
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bottomSpacing: 0, |
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className: 'is-sticky', |
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wrapperClassName: 'sticky-wrapper', |
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center: false, |
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getWidthFrom: '', |
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widthFromWrapper: true, // works only when .getWidthFrom is empty
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responsiveWidth: false, |
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zIndex: 'auto' |
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}, |
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$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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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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//update height in case of dynamic content
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s.stickyWrapper.css('height', s.stickyElement.outerHeight()); |
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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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newWidth = $(s.getWidthFrom).width() || 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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s.stickyElement.parent().addClass(s.className); |
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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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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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s.currentTop = newTop; |
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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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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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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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var stickyId = stickyElement.attr('id'); |
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var wrapperId = stickyId ? stickyId + '-' + defaults.wrapperClassName : defaults.wrapperClassName; |
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var wrapper = $('<div></div>') |
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.attr('id', wrapperId) |
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.addClass(o.wrapperClassName); |
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stickyElement.wrapAll(function() { |
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if ($(this).parent("#" + wrapperId).length == 0) { |
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return wrapper; |
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} |
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}); |
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var stickyWrapper = stickyElement.parent(); |
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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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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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o.stickyElement = stickyElement; |
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o.stickyWrapper = stickyWrapper; |
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o.currentTop = null; |
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sticked.push(o); |
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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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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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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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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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// should be more efficient than using $window.scroll(scroller) and $window.resize(resizer):
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if (window.addEventListener) { |
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window.addEventListener('scroll', scroller, false); |
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window.addEventListener('resize', resizer, false); |
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} else if (window.attachEvent) { |
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window.attachEvent('onscroll', scroller); |
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window.attachEvent('onresize', resizer); |
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} |
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$.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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$.error('Method ' + method + ' does not exist on jQuery.sticky'); |
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} |
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}; |
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$.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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