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/*! UIkit 2.27.5 | http://www.getuikit.com | (c) 2014 YOOtheme | MIT License */
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(function(addon) {
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var component;
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if (window.UIkit2) {
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component = addon(UIkit2);
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}
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if (typeof define == 'function' && define.amd) {
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define('uikit-sticky', ['uikit'], function(){
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return component || addon(UIkit2);
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});
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}
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})(function(UI){
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"use strict";
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var $win = UI.$win,
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$doc = UI.$doc,
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sticked = [],
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direction = 1;
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UI.component('sticky', {
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defaults: {
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top : 0,
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bottom : 0,
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animation : '',
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clsinit : 'uk-sticky-init',
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clsactive : 'uk-active',
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clsinactive : '',
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getWidthFrom : '',
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showup : false,
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boundary : false,
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media : false,
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target : false,
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disabled : false
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},
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boot: function() {
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// should be more efficient than using $win.scroll(checkscrollposition):
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UI.$doc.on('scrolling.uk.document', function(e, data) {
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if (!data || !data.dir) return;
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direction = data.dir.y;
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checkscrollposition();
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});
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UI.$win.on('resize orientationchange', UI.Utils.debounce(function() {
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if (!sticked.length) return;
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for (var i = 0; i < sticked.length; i++) {
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sticked[i].reset(true);
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sticked[i].self.computeWrapper();
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}
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checkscrollposition();
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}, 100));
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// init code
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UI.ready(function(context) {
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setTimeout(function(){
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UI.$('[data-uk-sticky]', context).each(function(){
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var $ele = UI.$(this);
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if (!$ele.data('sticky')) {
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UI.sticky($ele, UI.Utils.options($ele.attr('data-uk-sticky')));
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}
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});
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checkscrollposition();
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}, 0);
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});
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},
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init: function() {
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var boundary = this.options.boundary, boundtoparent;
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this.wrapper = this.element.wrap('<div class="uk-sticky-placeholder"></div>').parent();
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this.computeWrapper();
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this.wrapper.css({
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'margin-top' : this.element.css('margin-top'),
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'margin-bottom' : this.element.css('margin-bottom'),
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'margin-left' : this.element.css('margin-left'),
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'margin-right' : this.element.css('margin-right')
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})
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this.element.css('margin', 0);
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if (boundary) {
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if (boundary === true || boundary[0] === '!') {
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boundary = boundary === true ? this.wrapper.parent() : this.wrapper.closest(boundary.substr(1));
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boundtoparent = true;
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} else if (typeof boundary === "string") {
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boundary = UI.$(boundary);
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}
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}
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this.sticky = {
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self : this,
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options : this.options,
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element : this.element,
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currentTop : null,
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wrapper : this.wrapper,
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init : false,
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getWidthFrom : UI.$(this.options.getWidthFrom || this.wrapper),
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boundary : boundary,
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boundtoparent : boundtoparent,
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top : 0,
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calcTop : function() {
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var top = this.options.top;
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// dynamic top parameter
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if (this.options.top && typeof(this.options.top) == 'string') {
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// e.g. 50vh
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if (this.options.top.match(/^(-|)(\d+)vh$/)) {
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top = window.innerHeight * parseInt(this.options.top, 10)/100;
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// e.g. #elementId, or .class-1,class-2,.class-3 (first found is used)
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} else {
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var topElement = UI.$(this.options.top).first();
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if (topElement.length && topElement.is(':visible')) {
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top = -1 * ((topElement.offset().top + topElement.outerHeight()) - this.wrapper.offset().top);
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}
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}
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}
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this.top = top;
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},
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reset: function(force) {
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this.calcTop();
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var finalize = function() {
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this.element.css({position:'', top:'', width:'', left:'', margin:'0'});
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this.element.removeClass([this.options.animation, 'uk-animation-reverse', this.options.clsactive].join(' '));
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this.element.addClass(this.options.clsinactive);
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this.element.trigger('inactive.uk.sticky');
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this.currentTop = null;
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this.animate = false;
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}.bind(this);
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if (!force && this.options.animation && UI.support.animation && !UI.Utils.isInView(this.wrapper)) {
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this.animate = true;
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this.element.removeClass(this.options.animation).one(UI.support.animation.end, function(){
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finalize();
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}).width(); // force redraw
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this.element.addClass(this.options.animation+' '+'uk-animation-reverse');
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} else {
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finalize();
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}
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},
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check: function() {
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if (this.options.disabled) {
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return false;
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}
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if (this.options.media) {
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switch(typeof(this.options.media)) {
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case 'number':
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if (window.innerWidth < this.options.media) {
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return false;
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}
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break;
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case 'string':
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if (window.matchMedia && !window.matchMedia(this.options.media).matches) {
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return false;
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}
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break;
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}
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}
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var scrollTop = $win.scrollTop(),
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documentHeight = $doc.height(),
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dwh = documentHeight - window.innerHeight,
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extra = (scrollTop > dwh) ? dwh - scrollTop : 0,
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elementTop = this.wrapper.offset().top,
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etse = elementTop - this.top - extra,
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active = (scrollTop >= etse);
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if (active && this.options.showup) {
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// set inactiv if scrolling down
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if (direction == 1) {
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active = false;
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}
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// set inactive when wrapper is still in view
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if (direction == -1 && !this.element.hasClass(this.options.clsactive) && UI.Utils.isInView(this.wrapper)) {
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active = false;
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}
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}
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return active;
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}
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};
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this.sticky.calcTop();
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sticked.push(this.sticky);
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},
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update: function() {
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checkscrollposition(this.sticky);
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},
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enable: function() {
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this.options.disabled = false;
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this.update();
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},
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disable: function(force) {
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this.options.disabled = true;
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this.sticky.reset(force);
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},
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computeWrapper: function() {
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this.wrapper.css({
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'height' : ['absolute','fixed'].indexOf(this.element.css('position')) == -1 ? this.element.outerHeight() : '',
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'float' : this.element.css('float') != 'none' ? this.element.css('float') : ''
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});
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if (this.element.css('position') == 'fixed') {
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this.element.css({
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width: this.sticky.getWidthFrom.length ? this.sticky.getWidthFrom.width() : this.element.width()
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});
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}
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}
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});
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function checkscrollposition(direction) {
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var stickies = arguments.length ? arguments : sticked;
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if (!stickies.length || $win.scrollTop() < 0) return;
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var scrollTop = $win.scrollTop(),
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documentHeight = $doc.height(),
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windowHeight = $win.height(),
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dwh = documentHeight - windowHeight,
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extra = (scrollTop > dwh) ? dwh - scrollTop : 0,
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newTop, containerBottom, stickyHeight, sticky;
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for (var i = 0; i < stickies.length; i++) {
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sticky = stickies[i];
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if (!sticky.element.is(':visible') || sticky.animate) {
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continue;
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}
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if (!sticky.check()) {
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if (sticky.currentTop !== null) {
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sticky.reset();
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}
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} else {
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if (sticky.top < 0) {
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newTop = 0;
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} else {
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stickyHeight = sticky.element.outerHeight();
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newTop = documentHeight - stickyHeight - sticky.top - sticky.options.bottom - scrollTop - extra;
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newTop = newTop < 0 ? newTop + sticky.top : sticky.top;
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}
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if (sticky.boundary && sticky.boundary.length) {
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var bTop = sticky.boundary.offset().top;
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if (sticky.boundtoparent) {
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containerBottom = documentHeight - (bTop + sticky.boundary.outerHeight()) + parseInt(sticky.boundary.css('padding-bottom'));
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} else {
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containerBottom = documentHeight - bTop;
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}
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newTop = (scrollTop + stickyHeight) > (documentHeight - containerBottom - (sticky.top < 0 ? 0 : sticky.top)) ? (documentHeight - containerBottom) - (scrollTop + stickyHeight) : newTop;
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}
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if (sticky.currentTop != newTop) {
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sticky.element.css({
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position : 'fixed',
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top : newTop,
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width : sticky.getWidthFrom.length ? sticky.getWidthFrom.width() : sticky.element.width()
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});
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if (!sticky.init) {
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sticky.element.addClass(sticky.options.clsinit);
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if (location.hash && scrollTop > 0 && sticky.options.target) {
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var $target = UI.$(location.hash);
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if ($target.length) {
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setTimeout((function($target, sticky){
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return function() {
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sticky.element.width(); // force redraw
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var offset = $target.offset(),
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maxoffset = offset.top + $target.outerHeight(),
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stickyOffset = sticky.element.offset(),
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stickyHeight = sticky.element.outerHeight(),
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stickyMaxOffset = stickyOffset.top + stickyHeight;
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if (stickyOffset.top < maxoffset && offset.top < stickyMaxOffset) {
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scrollTop = offset.top - stickyHeight - sticky.options.target;
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window.scrollTo(0, scrollTop);
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}
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};
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})($target, sticky), 0);
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}
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}
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}
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sticky.element.addClass(sticky.options.clsactive).removeClass(sticky.options.clsinactive);
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sticky.element.trigger('active.uk.sticky');
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sticky.element.css('margin', '');
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if (sticky.options.animation && sticky.init && !UI.Utils.isInView(sticky.wrapper)) {
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sticky.element.addClass(sticky.options.animation);
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}
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sticky.currentTop = newTop;
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}
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}
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sticky.init = true;
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}
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}
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return UI.sticky;
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});
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