275 lines
9.3 KiB
JavaScript
275 lines
9.3 KiB
JavaScript
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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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var o = $.extend({}, defaults, options);
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return this.each(function() {
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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(wrapper);
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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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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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}
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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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