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937 lines
29 KiB
937 lines
29 KiB
/*!
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* # Semantic UI 2.2.0 - Sticky
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* http://github.com/semantic-org/semantic-ui/
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*
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*
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* Copyright 2015 Contributors
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* Released under the MIT license
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* http://opensource.org/licenses/MIT
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*
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*/
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;(function ($, window, document, undefined) {
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"use strict";
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window = (typeof window != 'undefined' && window.Math == Math)
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? window
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: (typeof self != 'undefined' && self.Math == Math)
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? self
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: Function('return this')()
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;
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$.fn.sticky = function(parameters) {
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var
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$allModules = $(this),
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moduleSelector = $allModules.selector || '',
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time = new Date().getTime(),
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performance = [],
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query = arguments[0],
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methodInvoked = (typeof query == 'string'),
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queryArguments = [].slice.call(arguments, 1),
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returnedValue
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;
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$allModules
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.each(function() {
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var
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settings = ( $.isPlainObject(parameters) )
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? $.extend(true, {}, $.fn.sticky.settings, parameters)
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: $.extend({}, $.fn.sticky.settings),
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className = settings.className,
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namespace = settings.namespace,
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error = settings.error,
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eventNamespace = '.' + namespace,
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moduleNamespace = 'module-' + namespace,
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$module = $(this),
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$window = $(window),
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$scroll = $(settings.scrollContext),
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$container,
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$context,
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selector = $module.selector || '',
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instance = $module.data(moduleNamespace),
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requestAnimationFrame = window.requestAnimationFrame
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|| window.mozRequestAnimationFrame
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|| window.webkitRequestAnimationFrame
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|| window.msRequestAnimationFrame
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|| function(callback) { setTimeout(callback, 0); },
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element = this,
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documentObserver,
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observer,
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module
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;
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module = {
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initialize: function() {
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module.determineContainer();
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module.determineContext();
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module.verbose('Initializing sticky', settings, $container);
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module.save.positions();
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module.checkErrors();
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module.bind.events();
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if(settings.observeChanges) {
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module.observeChanges();
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}
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module.instantiate();
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},
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instantiate: function() {
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module.verbose('Storing instance of module', module);
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instance = module;
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$module
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.data(moduleNamespace, module)
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;
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},
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destroy: function() {
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module.verbose('Destroying previous instance');
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module.reset();
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if(documentObserver) {
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documentObserver.disconnect();
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}
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if(observer) {
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observer.disconnect();
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}
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$window
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.off('load' + eventNamespace, module.event.load)
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.off('resize' + eventNamespace, module.event.resize)
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;
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$scroll
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.off('scrollchange' + eventNamespace, module.event.scrollchange)
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;
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$module.removeData(moduleNamespace);
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},
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observeChanges: function() {
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if('MutationObserver' in window) {
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documentObserver = new MutationObserver(module.event.documentChanged);
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observer = new MutationObserver(module.event.changed);
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documentObserver.observe(document, {
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childList : true,
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subtree : true
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});
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observer.observe(element, {
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childList : true,
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subtree : true
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});
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observer.observe($context[0], {
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childList : true,
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subtree : true
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});
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module.debug('Setting up mutation observer', observer);
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}
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},
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determineContainer: function() {
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$container = $module.offsetParent();
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},
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determineContext: function() {
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if(settings.context) {
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$context = $(settings.context);
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}
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else {
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$context = $container;
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}
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if($context.length === 0) {
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module.error(error.invalidContext, settings.context, $module);
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return;
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}
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},
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checkErrors: function() {
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if( module.is.hidden() ) {
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module.error(error.visible, $module);
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}
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if(module.cache.element.height > module.cache.context.height) {
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module.reset();
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module.error(error.elementSize, $module);
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return;
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}
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},
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bind: {
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events: function() {
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$window
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.on('load' + eventNamespace, module.event.load)
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.on('resize' + eventNamespace, module.event.resize)
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;
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// pub/sub pattern
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$scroll
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.off('scroll' + eventNamespace)
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.on('scroll' + eventNamespace, module.event.scroll)
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.on('scrollchange' + eventNamespace, module.event.scrollchange)
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;
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}
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},
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event: {
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changed: function(mutations) {
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clearTimeout(module.timer);
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module.timer = setTimeout(function() {
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module.verbose('DOM tree modified, updating sticky menu', mutations);
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module.refresh();
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}, 100);
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},
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documentChanged: function(mutations) {
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[].forEach.call(mutations, function(mutation) {
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if(mutation.removedNodes) {
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[].forEach.call(mutation.removedNodes, function(node) {
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if(node == element || $(node).find(element).length > 0) {
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module.debug('Element removed from DOM, tearing down events');
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module.destroy();
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}
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});
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}
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});
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},
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load: function() {
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module.verbose('Page contents finished loading');
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requestAnimationFrame(module.refresh);
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},
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resize: function() {
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module.verbose('Window resized');
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requestAnimationFrame(module.refresh);
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},
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scroll: function() {
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requestAnimationFrame(function() {
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$scroll.triggerHandler('scrollchange' + eventNamespace, $scroll.scrollTop() );
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});
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},
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scrollchange: function(event, scrollPosition) {
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module.stick(scrollPosition);
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settings.onScroll.call(element);
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}
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},
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refresh: function(hardRefresh) {
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module.reset();
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if(!settings.context) {
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module.determineContext();
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}
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if(hardRefresh) {
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module.determineContainer();
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}
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module.save.positions();
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module.stick();
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settings.onReposition.call(element);
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},
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supports: {
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sticky: function() {
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var
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$element = $('<div/>'),
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element = $element[0]
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;
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$element.addClass(className.supported);
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return($element.css('position').match('sticky'));
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}
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},
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save: {
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lastScroll: function(scroll) {
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module.lastScroll = scroll;
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},
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elementScroll: function(scroll) {
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module.elementScroll = scroll;
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},
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positions: function() {
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var
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scrollContext = {
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height : $scroll.height()
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},
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element = {
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margin: {
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top : parseInt($module.css('margin-top'), 10),
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bottom : parseInt($module.css('margin-bottom'), 10),
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},
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offset : $module.offset(),
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width : $module.outerWidth(),
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height : $module.outerHeight()
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},
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context = {
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offset : $context.offset(),
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height : $context.outerHeight()
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},
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container = {
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height: $container.outerHeight()
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}
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;
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if( !module.is.standardScroll() ) {
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module.debug('Non-standard scroll. Removing scroll offset from element offset');
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scrollContext.top = $scroll.scrollTop();
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scrollContext.left = $scroll.scrollLeft();
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element.offset.top += scrollContext.top;
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context.offset.top += scrollContext.top;
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element.offset.left += scrollContext.left;
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context.offset.left += scrollContext.left;
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}
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module.cache = {
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fits : ( element.height < scrollContext.height ),
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scrollContext : {
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height : scrollContext.height
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},
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element: {
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margin : element.margin,
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top : element.offset.top - element.margin.top,
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left : element.offset.left,
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width : element.width,
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height : element.height,
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bottom : element.offset.top + element.height
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},
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context: {
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top : context.offset.top,
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height : context.height,
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bottom : context.offset.top + context.height
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}
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};
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module.set.containerSize();
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module.set.size();
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module.stick();
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module.debug('Caching element positions', module.cache);
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}
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},
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get: {
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direction: function(scroll) {
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var
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direction = 'down'
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;
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scroll = scroll || $scroll.scrollTop();
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if(module.lastScroll !== undefined) {
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if(module.lastScroll < scroll) {
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direction = 'down';
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}
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else if(module.lastScroll > scroll) {
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direction = 'up';
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}
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}
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return direction;
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},
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scrollChange: function(scroll) {
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scroll = scroll || $scroll.scrollTop();
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return (module.lastScroll)
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? (scroll - module.lastScroll)
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: 0
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;
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},
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currentElementScroll: function() {
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if(module.elementScroll) {
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return module.elementScroll;
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}
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return ( module.is.top() )
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? Math.abs(parseInt($module.css('top'), 10)) || 0
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: Math.abs(parseInt($module.css('bottom'), 10)) || 0
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;
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},
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elementScroll: function(scroll) {
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scroll = scroll || $scroll.scrollTop();
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var
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element = module.cache.element,
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scrollContext = module.cache.scrollContext,
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delta = module.get.scrollChange(scroll),
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maxScroll = (element.height - scrollContext.height + settings.offset),
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elementScroll = module.get.currentElementScroll(),
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possibleScroll = (elementScroll + delta)
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;
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if(module.cache.fits || possibleScroll < 0) {
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elementScroll = 0;
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}
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else if(possibleScroll > maxScroll ) {
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elementScroll = maxScroll;
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}
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else {
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elementScroll = possibleScroll;
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}
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return elementScroll;
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}
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},
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remove: {
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lastScroll: function() {
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delete module.lastScroll;
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},
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elementScroll: function(scroll) {
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delete module.elementScroll;
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},
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offset: function() {
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$module.css('margin-top', '');
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}
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},
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set: {
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offset: function() {
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module.verbose('Setting offset on element', settings.offset);
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$module
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.css('margin-top', settings.offset)
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;
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},
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containerSize: function() {
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var
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tagName = $container.get(0).tagName
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;
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if(tagName === 'HTML' || tagName == 'body') {
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// this can trigger for too many reasons
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//module.error(error.container, tagName, $module);
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module.determineContainer();
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}
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else {
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if( Math.abs($container.outerHeight() - module.cache.context.height) > settings.jitter) {
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module.debug('Context has padding, specifying exact height for container', module.cache.context.height);
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$container.css({
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height: module.cache.context.height
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});
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}
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}
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},
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minimumSize: function() {
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var
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element = module.cache.element
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;
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$container
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.css('min-height', element.height)
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;
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},
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scroll: function(scroll) {
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module.debug('Setting scroll on element', scroll);
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if(module.elementScroll == scroll) {
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return;
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}
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if( module.is.top() ) {
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$module
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.css('bottom', '')
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.css('top', -scroll)
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;
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}
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if( module.is.bottom() ) {
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$module
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.css('top', '')
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.css('bottom', scroll)
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;
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}
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},
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size: function() {
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if(module.cache.element.height !== 0 && module.cache.element.width !== 0) {
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element.style.setProperty('width', module.cache.element.width + 'px', 'important');
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element.style.setProperty('height', module.cache.element.height + 'px', 'important');
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}
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}
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},
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is: {
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standardScroll: function() {
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return ($scroll[0] == window);
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},
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top: function() {
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return $module.hasClass(className.top);
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},
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bottom: function() {
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return $module.hasClass(className.bottom);
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},
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initialPosition: function() {
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return (!module.is.fixed() && !module.is.bound());
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},
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hidden: function() {
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return (!$module.is(':visible'));
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},
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bound: function() {
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return $module.hasClass(className.bound);
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},
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fixed: function() {
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return $module.hasClass(className.fixed);
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}
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},
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stick: function(scroll) {
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var
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cachedPosition = scroll || $scroll.scrollTop(),
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cache = module.cache,
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fits = cache.fits,
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element = cache.element,
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scrollContext = cache.scrollContext,
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context = cache.context,
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offset = (module.is.bottom() && settings.pushing)
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? settings.bottomOffset
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: settings.offset,
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scroll = {
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top : cachedPosition + offset,
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bottom : cachedPosition + offset + scrollContext.height
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},
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direction = module.get.direction(scroll.top),
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elementScroll = (fits)
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? 0
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: module.get.elementScroll(scroll.top),
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// shorthand
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doesntFit = !fits,
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elementVisible = (element.height !== 0)
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;
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if(elementVisible) {
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if( module.is.initialPosition() ) {
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if(scroll.top >= context.bottom) {
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module.debug('Initial element position is bottom of container');
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module.bindBottom();
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}
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else if(scroll.top > element.top) {
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if( (element.height + scroll.top - elementScroll) >= context.bottom ) {
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module.debug('Initial element position is bottom of container');
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module.bindBottom();
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}
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else {
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module.debug('Initial element position is fixed');
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module.fixTop();
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}
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}
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}
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else if( module.is.fixed() ) {
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// currently fixed top
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if( module.is.top() ) {
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if( scroll.top <= element.top ) {
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module.debug('Fixed element reached top of container');
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module.setInitialPosition();
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}
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else if( (element.height + scroll.top - elementScroll) >= context.bottom ) {
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module.debug('Fixed element reached bottom of container');
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module.bindBottom();
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}
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// scroll element if larger than screen
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else if(doesntFit) {
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module.set.scroll(elementScroll);
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module.save.lastScroll(scroll.top);
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module.save.elementScroll(elementScroll);
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}
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}
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// currently fixed bottom
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else if(module.is.bottom() ) {
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// top edge
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if( (scroll.bottom - element.height) <= element.top) {
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module.debug('Bottom fixed rail has reached top of container');
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module.setInitialPosition();
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}
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// bottom edge
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else if(scroll.bottom >= context.bottom) {
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module.debug('Bottom fixed rail has reached bottom of container');
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module.bindBottom();
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}
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// scroll element if larger than screen
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else if(doesntFit) {
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module.set.scroll(elementScroll);
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module.save.lastScroll(scroll.top);
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module.save.elementScroll(elementScroll);
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}
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}
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}
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else if( module.is.bottom() ) {
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if( scroll.top <= element.top ) {
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module.debug('Jumped from bottom fixed to top fixed, most likely used home/end button');
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module.setInitialPosition();
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}
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else {
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if(settings.pushing) {
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if(module.is.bound() && scroll.bottom <= context.bottom ) {
|
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module.debug('Fixing bottom attached element to bottom of browser.');
|
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module.fixBottom();
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}
|
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}
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else {
|
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if(module.is.bound() && (scroll.top <= context.bottom - element.height) ) {
|
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module.debug('Fixing bottom attached element to top of browser.');
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module.fixTop();
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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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bindTop: function() {
|
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module.debug('Binding element to top of parent container');
|
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module.remove.offset();
|
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$module
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.css({
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left : '',
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top : '',
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marginBottom : ''
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})
|
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.removeClass(className.fixed)
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.removeClass(className.bottom)
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.addClass(className.bound)
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.addClass(className.top)
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;
|
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settings.onTop.call(element);
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settings.onUnstick.call(element);
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},
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bindBottom: function() {
|
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module.debug('Binding element to bottom of parent container');
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module.remove.offset();
|
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$module
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.css({
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left : '',
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top : ''
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})
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.removeClass(className.fixed)
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.removeClass(className.top)
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.addClass(className.bound)
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.addClass(className.bottom)
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;
|
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settings.onBottom.call(element);
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|
settings.onUnstick.call(element);
|
|
},
|
|
|
|
setInitialPosition: function() {
|
|
module.debug('Returning to initial position');
|
|
module.unfix();
|
|
module.unbind();
|
|
},
|
|
|
|
|
|
fixTop: function() {
|
|
module.debug('Fixing element to top of page');
|
|
module.set.minimumSize();
|
|
module.set.offset();
|
|
$module
|
|
.css({
|
|
left : module.cache.element.left,
|
|
bottom : '',
|
|
marginBottom : ''
|
|
})
|
|
.removeClass(className.bound)
|
|
.removeClass(className.bottom)
|
|
.addClass(className.fixed)
|
|
.addClass(className.top)
|
|
;
|
|
settings.onStick.call(element);
|
|
},
|
|
|
|
fixBottom: function() {
|
|
module.debug('Sticking element to bottom of page');
|
|
module.set.minimumSize();
|
|
module.set.offset();
|
|
$module
|
|
.css({
|
|
left : module.cache.element.left,
|
|
bottom : '',
|
|
marginBottom : ''
|
|
})
|
|
.removeClass(className.bound)
|
|
.removeClass(className.top)
|
|
.addClass(className.fixed)
|
|
.addClass(className.bottom)
|
|
;
|
|
settings.onStick.call(element);
|
|
},
|
|
|
|
unbind: function() {
|
|
if( module.is.bound() ) {
|
|
module.debug('Removing container bound position on element');
|
|
module.remove.offset();
|
|
$module
|
|
.removeClass(className.bound)
|
|
.removeClass(className.top)
|
|
.removeClass(className.bottom)
|
|
;
|
|
}
|
|
},
|
|
|
|
unfix: function() {
|
|
if( module.is.fixed() ) {
|
|
module.debug('Removing fixed position on element');
|
|
module.remove.offset();
|
|
$module
|
|
.removeClass(className.fixed)
|
|
.removeClass(className.top)
|
|
.removeClass(className.bottom)
|
|
;
|
|
settings.onUnstick.call(element);
|
|
}
|
|
},
|
|
|
|
reset: function() {
|
|
module.debug('Resetting elements position');
|
|
module.unbind();
|
|
module.unfix();
|
|
module.resetCSS();
|
|
module.remove.offset();
|
|
module.remove.lastScroll();
|
|
},
|
|
|
|
resetCSS: function() {
|
|
$module
|
|
.css({
|
|
width : '',
|
|
height : ''
|
|
})
|
|
;
|
|
$container
|
|
.css({
|
|
height: ''
|
|
})
|
|
;
|
|
},
|
|
|
|
setting: function(name, value) {
|
|
if( $.isPlainObject(name) ) {
|
|
$.extend(true, settings, name);
|
|
}
|
|
else if(value !== undefined) {
|
|
settings[name] = value;
|
|
}
|
|
else {
|
|
return settings[name];
|
|
}
|
|
},
|
|
internal: function(name, value) {
|
|
if( $.isPlainObject(name) ) {
|
|
$.extend(true, module, name);
|
|
}
|
|
else if(value !== undefined) {
|
|
module[name] = value;
|
|
}
|
|
else {
|
|
return module[name];
|
|
}
|
|
},
|
|
debug: function() {
|
|
if(!settings.silent && settings.debug) {
|
|
if(settings.performance) {
|
|
module.performance.log(arguments);
|
|
}
|
|
else {
|
|
module.debug = Function.prototype.bind.call(console.info, console, settings.name + ':');
|
|
module.debug.apply(console, arguments);
|
|
}
|
|
}
|
|
},
|
|
verbose: function() {
|
|
if(!settings.silent && settings.verbose && settings.debug) {
|
|
if(settings.performance) {
|
|
module.performance.log(arguments);
|
|
}
|
|
else {
|
|
module.verbose = Function.prototype.bind.call(console.info, console, settings.name + ':');
|
|
module.verbose.apply(console, arguments);
|
|
}
|
|
}
|
|
},
|
|
error: function() {
|
|
if(!settings.silent) {
|
|
module.error = Function.prototype.bind.call(console.error, console, settings.name + ':');
|
|
module.error.apply(console, arguments);
|
|
}
|
|
},
|
|
performance: {
|
|
log: function(message) {
|
|
var
|
|
currentTime,
|
|
executionTime,
|
|
previousTime
|
|
;
|
|
if(settings.performance) {
|
|
currentTime = new Date().getTime();
|
|
previousTime = time || currentTime;
|
|
executionTime = currentTime - previousTime;
|
|
time = currentTime;
|
|
performance.push({
|
|
'Name' : message[0],
|
|
'Arguments' : [].slice.call(message, 1) || '',
|
|
'Element' : element,
|
|
'Execution Time' : executionTime
|
|
});
|
|
}
|
|
clearTimeout(module.performance.timer);
|
|
module.performance.timer = setTimeout(module.performance.display, 0);
|
|
},
|
|
display: function() {
|
|
var
|
|
title = settings.name + ':',
|
|
totalTime = 0
|
|
;
|
|
time = false;
|
|
clearTimeout(module.performance.timer);
|
|
$.each(performance, function(index, data) {
|
|
totalTime += data['Execution Time'];
|
|
});
|
|
title += ' ' + totalTime + 'ms';
|
|
if(moduleSelector) {
|
|
title += ' \'' + moduleSelector + '\'';
|
|
}
|
|
if( (console.group !== undefined || console.table !== undefined) && performance.length > 0) {
|
|
console.groupCollapsed(title);
|
|
if(console.table) {
|
|
console.table(performance);
|
|
}
|
|
else {
|
|
$.each(performance, function(index, data) {
|
|
console.log(data['Name'] + ': ' + data['Execution Time']+'ms');
|
|
});
|
|
}
|
|
console.groupEnd();
|
|
}
|
|
performance = [];
|
|
}
|
|
},
|
|
invoke: function(query, passedArguments, context) {
|
|
var
|
|
object = instance,
|
|
maxDepth,
|
|
found,
|
|
response
|
|
;
|
|
passedArguments = passedArguments || queryArguments;
|
|
context = element || context;
|
|
if(typeof query == 'string' && object !== undefined) {
|
|
query = query.split(/[\. ]/);
|
|
maxDepth = query.length - 1;
|
|
$.each(query, function(depth, value) {
|
|
var camelCaseValue = (depth != maxDepth)
|
|
? value + query[depth + 1].charAt(0).toUpperCase() + query[depth + 1].slice(1)
|
|
: query
|
|
;
|
|
if( $.isPlainObject( object[camelCaseValue] ) && (depth != maxDepth) ) {
|
|
object = object[camelCaseValue];
|
|
}
|
|
else if( object[camelCaseValue] !== undefined ) {
|
|
found = object[camelCaseValue];
|
|
return false;
|
|
}
|
|
else if( $.isPlainObject( object[value] ) && (depth != maxDepth) ) {
|
|
object = object[value];
|
|
}
|
|
else if( object[value] !== undefined ) {
|
|
found = object[value];
|
|
return false;
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
});
|
|
}
|
|
if ( $.isFunction( found ) ) {
|
|
response = found.apply(context, passedArguments);
|
|
}
|
|
else if(found !== undefined) {
|
|
response = found;
|
|
}
|
|
if($.isArray(returnedValue)) {
|
|
returnedValue.push(response);
|
|
}
|
|
else if(returnedValue !== undefined) {
|
|
returnedValue = [returnedValue, response];
|
|
}
|
|
else if(response !== undefined) {
|
|
returnedValue = response;
|
|
}
|
|
return found;
|
|
}
|
|
};
|
|
|
|
if(methodInvoked) {
|
|
if(instance === undefined) {
|
|
module.initialize();
|
|
}
|
|
module.invoke(query);
|
|
}
|
|
else {
|
|
if(instance !== undefined) {
|
|
instance.invoke('destroy');
|
|
}
|
|
module.initialize();
|
|
}
|
|
})
|
|
;
|
|
|
|
return (returnedValue !== undefined)
|
|
? returnedValue
|
|
: this
|
|
;
|
|
};
|
|
|
|
$.fn.sticky.settings = {
|
|
|
|
name : 'Sticky',
|
|
namespace : 'sticky',
|
|
|
|
silent : false,
|
|
debug : false,
|
|
verbose : true,
|
|
performance : true,
|
|
|
|
// whether to stick in the opposite direction on scroll up
|
|
pushing : false,
|
|
|
|
context : false,
|
|
|
|
// Context to watch scroll events
|
|
scrollContext : window,
|
|
|
|
// Offset to adjust scroll
|
|
offset : 0,
|
|
|
|
// Offset to adjust scroll when attached to bottom of screen
|
|
bottomOffset : 0,
|
|
|
|
jitter : 5, // will only set container height if difference between context and container is larger than this number
|
|
|
|
// Whether to automatically observe changes with Mutation Observers
|
|
observeChanges : false,
|
|
|
|
// Called when position is recalculated
|
|
onReposition : function(){},
|
|
|
|
// Called on each scroll
|
|
onScroll : function(){},
|
|
|
|
// Called when element is stuck to viewport
|
|
onStick : function(){},
|
|
|
|
// Called when element is unstuck from viewport
|
|
onUnstick : function(){},
|
|
|
|
// Called when element reaches top of context
|
|
onTop : function(){},
|
|
|
|
// Called when element reaches bottom of context
|
|
onBottom : function(){},
|
|
|
|
error : {
|
|
container : 'Sticky element must be inside a relative container',
|
|
visible : 'Element is hidden, you must call refresh after element becomes visible. Use silent setting to surpress this warning in production.',
|
|
method : 'The method you called is not defined.',
|
|
invalidContext : 'Context specified does not exist',
|
|
elementSize : 'Sticky element is larger than its container, cannot create sticky.'
|
|
},
|
|
|
|
className : {
|
|
bound : 'bound',
|
|
fixed : 'fixed',
|
|
supported : 'native',
|
|
top : 'top',
|
|
bottom : 'bottom'
|
|
}
|
|
|
|
};
|
|
|
|
})( jQuery, window, document );
|