/*! UIkit 2.27.4 | http://www.getuikit.com | (c) 2014 YOOtheme | MIT License */ (function(addon) { var component; if (window.UIkit2) { component = addon(UIkit2); } if (typeof define == 'function' && define.amd) { define('uikit-sticky', ['uikit'], function(){ return component || addon(UIkit2); }); } })(function(UI){ "use strict"; var $win = UI.$win, $doc = UI.$doc, sticked = [], direction = 1; UI.component('sticky', { defaults: { top : 0, bottom : 0, animation : '', clsinit : 'uk-sticky-init', clsactive : 'uk-active', clsinactive : '', getWidthFrom : '', showup : false, boundary : false, media : false, target : false, disabled : false }, boot: function() { // should be more efficient than using $win.scroll(checkscrollposition): UI.$doc.on('scrolling.uk.document', function(e, data) { if (!data || !data.dir) return; direction = data.dir.y; checkscrollposition(); }); UI.$win.on('resize orientationchange', UI.Utils.debounce(function() { if (!sticked.length) return; for (var i = 0; i < sticked.length; i++) { sticked[i].reset(true); sticked[i].self.computeWrapper(); } checkscrollposition(); }, 100)); // init code UI.ready(function(context) { setTimeout(function(){ UI.$('[data-uk-sticky]', context).each(function(){ var $ele = UI.$(this); if (!$ele.data('sticky')) { UI.sticky($ele, UI.Utils.options($ele.attr('data-uk-sticky'))); } }); checkscrollposition(); }, 0); }); }, init: function() { var boundary = this.options.boundary, boundtoparent; this.wrapper = this.element.wrap('<div class="uk-sticky-placeholder"></div>').parent(); this.computeWrapper(); this.wrapper.css({ 'margin-top' : this.element.css('margin-top'), 'margin-bottom' : this.element.css('margin-bottom'), 'margin-left' : this.element.css('margin-left'), 'margin-right' : this.element.css('margin-right') }) this.element.css('margin', 0); if (boundary) { if (boundary === true || boundary[0] === '!') { boundary = boundary === true ? this.wrapper.parent() : this.wrapper.closest(boundary.substr(1)); boundtoparent = true; } else if (typeof boundary === "string") { boundary = UI.$(boundary); } } this.sticky = { self : this, options : this.options, element : this.element, currentTop : null, wrapper : this.wrapper, init : false, getWidthFrom : UI.$(this.options.getWidthFrom || this.wrapper), boundary : boundary, boundtoparent : boundtoparent, top : 0, calcTop : function() { var top = this.options.top; // dynamic top parameter if (this.options.top && typeof(this.options.top) == 'string') { // e.g. 50vh if (this.options.top.match(/^(-|)(\d+)vh$/)) { top = window.innerHeight * parseInt(this.options.top, 10)/100; // e.g. #elementId, or .class-1,class-2,.class-3 (first found is used) } else { var topElement = UI.$(this.options.top).first(); if (topElement.length && topElement.is(':visible')) { top = -1 * ((topElement.offset().top + topElement.outerHeight()) - this.wrapper.offset().top); } } } this.top = top; }, reset: function(force) { this.calcTop(); var finalize = function() { this.element.css({position:'', top:'', width:'', left:'', margin:'0'}); this.element.removeClass([this.options.animation, 'uk-animation-reverse', this.options.clsactive].join(' ')); this.element.addClass(this.options.clsinactive); this.element.trigger('inactive.uk.sticky'); this.currentTop = null; this.animate = false; }.bind(this); if (!force && this.options.animation && UI.support.animation && !UI.Utils.isInView(this.wrapper)) { this.animate = true; this.element.removeClass(this.options.animation).one(UI.support.animation.end, function(){ finalize(); }).width(); // force redraw this.element.addClass(this.options.animation+' '+'uk-animation-reverse'); } else { finalize(); } }, check: function() { if (this.options.disabled) { return false; } if (this.options.media) { switch(typeof(this.options.media)) { case 'number': if (window.innerWidth < this.options.media) { return false; } break; case 'string': if (window.matchMedia && !window.matchMedia(this.options.media).matches) { return false; } break; } } var scrollTop = $win.scrollTop(), documentHeight = $doc.height(), dwh = documentHeight - window.innerHeight, extra = (scrollTop > dwh) ? dwh - scrollTop : 0, elementTop = this.wrapper.offset().top, etse = elementTop - this.top - extra, active = (scrollTop >= etse); if (active && this.options.showup) { // set inactiv if scrolling down if (direction == 1) { active = false; } // set inactive when wrapper is still in view if (direction == -1 && !this.element.hasClass(this.options.clsactive) && UI.Utils.isInView(this.wrapper)) { active = false; } } return active; } }; this.sticky.calcTop(); sticked.push(this.sticky); }, update: function() { checkscrollposition(this.sticky); }, enable: function() { this.options.disabled = false; this.update(); }, disable: function(force) { this.options.disabled = true; this.sticky.reset(force); }, computeWrapper: function() { this.wrapper.css({ 'height' : ['absolute','fixed'].indexOf(this.element.css('position')) == -1 ? this.element.outerHeight() : '', 'float' : this.element.css('float') != 'none' ? this.element.css('float') : '' }); if (this.element.css('position') == 'fixed') { this.element.css({ width: this.sticky.getWidthFrom.length ? this.sticky.getWidthFrom.width() : this.element.width() }); } } }); function checkscrollposition(direction) { var stickies = arguments.length ? arguments : sticked; if (!stickies.length || $win.scrollTop() < 0) return; var scrollTop = $win.scrollTop(), documentHeight = $doc.height(), windowHeight = $win.height(), dwh = documentHeight - windowHeight, extra = (scrollTop > dwh) ? dwh - scrollTop : 0, newTop, containerBottom, stickyHeight, sticky; for (var i = 0; i < stickies.length; i++) { sticky = stickies[i]; if (!sticky.element.is(':visible') || sticky.animate) { continue; } if (!sticky.check()) { if (sticky.currentTop !== null) { sticky.reset(); } } else { if (sticky.top < 0) { newTop = 0; } else { stickyHeight = sticky.element.outerHeight(); newTop = documentHeight - stickyHeight - sticky.top - sticky.options.bottom - scrollTop - extra; newTop = newTop < 0 ? newTop + sticky.top : sticky.top; } if (sticky.boundary && sticky.boundary.length) { var bTop = sticky.boundary.offset().top; if (sticky.boundtoparent) { containerBottom = documentHeight - (bTop + sticky.boundary.outerHeight()) + parseInt(sticky.boundary.css('padding-bottom')); } else { containerBottom = documentHeight - bTop; } newTop = (scrollTop + stickyHeight) > (documentHeight - containerBottom - (sticky.top < 0 ? 0 : sticky.top)) ? (documentHeight - containerBottom) - (scrollTop + stickyHeight) : newTop; } if (sticky.currentTop != newTop) { sticky.element.css({ position : 'fixed', top : newTop, width : sticky.getWidthFrom.length ? sticky.getWidthFrom.width() : sticky.element.width() }); if (!sticky.init) { sticky.element.addClass(sticky.options.clsinit); if (location.hash && scrollTop > 0 && sticky.options.target) { var $target = UI.$(location.hash); if ($target.length) { setTimeout((function($target, sticky){ return function() { sticky.element.width(); // force redraw var offset = $target.offset(), maxoffset = offset.top + $target.outerHeight(), stickyOffset = sticky.element.offset(), stickyHeight = sticky.element.outerHeight(), stickyMaxOffset = stickyOffset.top + stickyHeight; if (stickyOffset.top < maxoffset && offset.top < stickyMaxOffset) { scrollTop = offset.top - stickyHeight - sticky.options.target; window.scrollTo(0, scrollTop); } }; })($target, sticky), 0); } } } sticky.element.addClass(sticky.options.clsactive).removeClass(sticky.options.clsinactive); sticky.element.trigger('active.uk.sticky'); sticky.element.css('margin', ''); if (sticky.options.animation && sticky.init && !UI.Utils.isInView(sticky.wrapper)) { sticky.element.addClass(sticky.options.animation); } sticky.currentTop = newTop; } } sticky.init = true; } } return UI.sticky; });