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- // Sticky Plugin v1.0.2 for jQuery
- // =============
- // Author: Anthony Garand
- // Improvements by German M. Bravo (Kronuz) and Ruud Kamphuis (ruudk)
- // Improvements by Leonardo C. Daronco (daronco)
- // Created: 2/14/2011
- // Date: 16/04/2015
- // Website: http://labs.anthonygarand.com/sticky
- // 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($) {
- 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
- },
- $window = $(window),
- $document = $(document),
- 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; i < sticked.length; i++) {
- var s = sticked[i],
- elementTop = s.stickyWrapper.offset().top,
- etse = elementTop - s.topSpacing - extra;
- if (scrollTop <= etse) {
- if (s.currentTop !== null) {
- s.stickyElement
- .css({
- 'width': '',
- 'position': '',
- 'top': ''
- });
- s.stickyElement.parent().removeClass(s.className);
- 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 ) {
- newWidth = $(s.getWidthFrom).width() || 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);
- s.stickyElement.parent().addClass(s.className);
- 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;
- }
- }
- }
- },
- resizer = function() {
- windowHeight = $window.height();
- for (var i = 0; i < sticked.length; i++) {
- var s = sticked[i];
- var newWidth = null;
- if ( s.getWidthFrom ) {
- if ( s.responsiveWidth === true ) {
- newWidth = $(s.getWidthFrom).width();
- }
- }
- else if(s.widthFromWrapper) {
- newWidth = s.stickyWrapper.width();
- }
- if ( newWidth != null ) {
- s.stickyElement.css('width', newWidth);
- }
- }
- },
- methods = {
- init: function(options) {
- var o = $.extend({}, defaults, options);
- return this.each(function() {
- var stickyElement = $(this);
- var stickyId = stickyElement.attr('id');
- var stickyHeight = stickyElement.outerHeight();
- var wrapperId = stickyId ? stickyId + '-' + defaults.wrapperClassName : defaults.wrapperClassName
- var wrapper = $('<div></div>')
- .attr('id', wrapperId)
- .addClass(o.wrapperClassName);
- stickyElement.wrapAll(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"});
- }
- stickyWrapper.css('height', stickyHeight);
- o.stickyElement = stickyElement;
- o.stickyWrapper = stickyWrapper;
- o.currentTop = null;
- sticked.push(o);
- });
- },
- 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': ''
- })
- ;
- }
- });
- }
- };
- // 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);
- });
- })(jQuery);
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