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/** |
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* @package assets |
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*/ |
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(function($, Symphony) { |
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'use strict'; |
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// holds up all instances |
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var instances = $(); |
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// last scroll position |
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var scrollTop = 0; |
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/** |
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* Create affix elements. |
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* Affix elements follow the scroll and are constrain by their container. |
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* |
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* @since Symphony 2.5 |
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* |
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* @name $.symphonyAffix |
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* @class |
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* |
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* @param {Object} options An object specifying containing the attributes specified below |
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* @param {String} [options.container=$(this).parent()] Selector to find affix container |
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* |
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* @example |
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var affix = $('#affix').symphonyAffix({ |
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container: '.parent', |
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}); |
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*/ |
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$.fn.symphonyAffix = function(options) { |
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var objects = $(this), |
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settings = { |
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// public |
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container: null, |
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// private |
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top: 0, |
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freespace: 0, |
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bottom: 0, |
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height: 0, |
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maxtop: 0 |
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}; |
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$.extend(settings, options); |
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/*--------------------------------------------------------------------- |
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Initialisation |
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---------------------------------------------------------------------*/ |
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objects.each(function createOneAffix() { |
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var itemSettings = $.extend({}, settings); |
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var item = $(this); |
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var updateItemSettings = function () { |
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itemSettings.top = itemSettings.container.offset().top; |
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itemSettings.freespace = itemSettings.container.height(); |
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itemSettings.bottom = itemSettings.top + itemSettings.freespace; |
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itemSettings.height = item.height(); |
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itemSettings.maxtop = (itemSettings.freespace - itemSettings.height) + 'px'; |
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}; |
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// use parent as default container |
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if (!itemSettings.container) { |
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itemSettings.container = item.parent(); |
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} |
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// resolve jQuery object |
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else { |
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itemSettings.container = $(itemSettings.container); |
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} |
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// cache cssom values |
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updateItemSettings(); |
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item.on('updatesettings.affix', updateItemSettings); |
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item.addClass('js-affix'); |
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// save instance settings |
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item.data('affix-settings', itemSettings); |
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// register instance |
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instances = instances.add(item); |
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}); |
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// Init |
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$(window).triggerHandler('scroll'); |
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return objects; |
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}; |
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/*-----------------------------------------------------------------------*/ |
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// One listener for all instances |
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$(window).scroll(function affixScroll(e) { |
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scrollTop = $(this).scrollTop(); |
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Symphony.Utilities.requestAnimationFrame(function affixScrollRaf() { |
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instances.each(function affixScrollOne() { |
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var item = $(this); |
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var settings = item.data('affix-settings'); |
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var cssClass = 'js-affix-scroll'; |
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var top = ''; |
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if (scrollTop < settings.top) { |
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cssClass = 'js-affix-top'; |
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} else if (scrollTop > settings.bottom) { |
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cssClass = 'js-affix-bottom'; |
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top = settings.maxtop; |
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} |
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// Do changes only if state changes |
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if (!item.hasClass(cssClass)) { |
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item |
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.removeClass('js-affix-scroll js-affix-top js-affix-bottom') |
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.addClass(cssClass) |
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.css({top: top}); |
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} |
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}); |
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}); |
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}); |
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})(window.jQuery, window.Symphony); |
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symphonycms /
symphony-2
This check looks for parameters in functions that are not used in the function body and are not followed by other parameters which are used inside the function.