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1312 lines
42 KiB
JavaScript
1312 lines
42 KiB
JavaScript
/*!
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* # Semantic UI 2.3.0 - Visibility
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* http://github.com/semantic-org/semantic-ui/
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*
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*
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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.visibility = 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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moduleCount = $allModules.length,
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loadedCount = 0
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;
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$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.visibility.settings, parameters)
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: $.extend({}, $.fn.visibility.settings),
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className = settings.className,
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namespace = settings.namespace,
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error = settings.error,
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metadata = settings.metadata,
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eventNamespace = '.' + namespace,
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moduleNamespace = 'module-' + namespace,
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$window = $(window),
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$module = $(this),
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$context = $(settings.context),
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$placeholder,
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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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disabled = false,
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contextObserver,
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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.debug('Initializing', settings);
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module.setup.cache();
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if( module.should.trackChanges() ) {
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if(settings.type == 'image') {
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module.setup.image();
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}
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if(settings.type == 'fixed') {
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module.setup.fixed();
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}
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if(settings.observeChanges) {
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module.observeChanges();
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}
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module.bind.events();
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}
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module.save.position();
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if( !module.is.visible() ) {
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module.error(error.visible, $module);
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}
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if(settings.initialCheck) {
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module.checkVisibility();
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}
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module.instantiate();
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},
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instantiate: function() {
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module.debug('Storing instance', module);
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$module
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.data(moduleNamespace, module)
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;
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instance = module;
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},
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destroy: function() {
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module.verbose('Destroying previous module');
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if(observer) {
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observer.disconnect();
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}
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if(contextObserver) {
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contextObserver.disconnect();
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}
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$window
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.off('load' + eventNamespace, module.event.load)
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.off('resize' + eventNamespace, module.event.resize)
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;
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$context
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.off('scroll' + eventNamespace, module.event.scroll)
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.off('scrollchange' + eventNamespace, module.event.scrollchange)
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;
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if(settings.type == 'fixed') {
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module.resetFixed();
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module.remove.placeholder();
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}
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$module
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.off(eventNamespace)
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.removeData(moduleNamespace)
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;
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},
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observeChanges: function() {
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if('MutationObserver' in window) {
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contextObserver = new MutationObserver(module.event.contextChanged);
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observer = new MutationObserver(module.event.changed);
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contextObserver.observe(document, {
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childList : true,
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subtree : true
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});
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observer.observe(element, {
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childList : true,
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subtree : true
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});
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module.debug('Setting up mutation observer', observer);
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}
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},
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bind: {
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events: function() {
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module.verbose('Binding visibility events to scroll and resize');
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if(settings.refreshOnLoad) {
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$window
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.on('load' + eventNamespace, module.event.load)
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;
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}
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$window
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.on('resize' + eventNamespace, module.event.resize)
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;
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// pub/sub pattern
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$context
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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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module.verbose('DOM tree modified, updating visibility calculations');
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module.timer = setTimeout(function() {
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module.verbose('DOM tree modified, updating sticky menu');
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module.refresh();
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}, 100);
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},
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contextChanged: 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 || $(node).find(element).length > 0) {
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module.debug('Element removed from DOM, tearing down events');
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module.destroy();
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}
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});
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}
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});
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},
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resize: function() {
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module.debug('Window resized');
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if(settings.refreshOnResize) {
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requestAnimationFrame(module.refresh);
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}
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},
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load: function() {
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module.debug('Page finished loading');
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requestAnimationFrame(module.refresh);
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},
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// publishes scrollchange event on one scroll
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scroll: function() {
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if(settings.throttle) {
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clearTimeout(module.timer);
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module.timer = setTimeout(function() {
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$context.triggerHandler('scrollchange' + eventNamespace, [ $context.scrollTop() ]);
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}, settings.throttle);
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}
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else {
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requestAnimationFrame(function() {
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$context.triggerHandler('scrollchange' + eventNamespace, [ $context.scrollTop() ]);
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});
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}
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},
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// subscribes to scrollchange
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scrollchange: function(event, scrollPosition) {
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module.checkVisibility(scrollPosition);
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},
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},
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precache: function(images, callback) {
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if (!(images instanceof Array)) {
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images = [images];
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}
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var
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imagesLength = images.length,
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loadedCounter = 0,
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cache = [],
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cacheImage = document.createElement('img'),
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handleLoad = function() {
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loadedCounter++;
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if (loadedCounter >= images.length) {
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if ($.isFunction(callback)) {
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callback();
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}
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}
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}
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;
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while (imagesLength--) {
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cacheImage = document.createElement('img');
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cacheImage.onload = handleLoad;
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cacheImage.onerror = handleLoad;
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cacheImage.src = images[imagesLength];
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cache.push(cacheImage);
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}
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},
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enableCallbacks: function() {
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module.debug('Allowing callbacks to occur');
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disabled = false;
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},
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disableCallbacks: function() {
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module.debug('Disabling all callbacks temporarily');
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disabled = true;
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},
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should: {
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trackChanges: function() {
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if(methodInvoked) {
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module.debug('One time query, no need to bind events');
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return false;
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}
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module.debug('Callbacks being attached');
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return true;
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}
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},
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setup: {
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cache: function() {
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module.cache = {
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occurred : {},
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screen : {},
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element : {},
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};
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},
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image: function() {
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var
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src = $module.data(metadata.src)
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;
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if(src) {
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module.verbose('Lazy loading image', src);
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settings.once = true;
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settings.observeChanges = false;
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// show when top visible
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settings.onOnScreen = function() {
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module.debug('Image on screen', element);
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module.precache(src, function() {
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module.set.image(src, function() {
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loadedCount++;
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if(loadedCount == moduleCount) {
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settings.onAllLoaded.call(this);
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}
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settings.onLoad.call(this);
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});
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});
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};
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}
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},
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fixed: function() {
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module.debug('Setting up fixed');
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settings.once = false;
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settings.observeChanges = false;
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settings.initialCheck = true;
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settings.refreshOnLoad = true;
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if(!parameters.transition) {
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settings.transition = false;
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}
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module.create.placeholder();
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module.debug('Added placeholder', $placeholder);
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settings.onTopPassed = function() {
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module.debug('Element passed, adding fixed position', $module);
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module.show.placeholder();
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module.set.fixed();
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if(settings.transition) {
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if($.fn.transition !== undefined) {
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$module.transition(settings.transition, settings.duration);
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}
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}
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};
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settings.onTopPassedReverse = function() {
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module.debug('Element returned to position, removing fixed', $module);
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module.hide.placeholder();
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module.remove.fixed();
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};
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}
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},
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create: {
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placeholder: function() {
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module.verbose('Creating fixed position placeholder');
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$placeholder = $module
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.clone(false)
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.css('display', 'none')
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.addClass(className.placeholder)
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.insertAfter($module)
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;
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}
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},
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show: {
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placeholder: function() {
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module.verbose('Showing placeholder');
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$placeholder
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.css('display', 'block')
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.css('visibility', 'hidden')
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;
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}
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},
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hide: {
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placeholder: function() {
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module.verbose('Hiding placeholder');
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$placeholder
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.css('display', 'none')
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.css('visibility', '')
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;
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}
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},
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set: {
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fixed: function() {
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module.verbose('Setting element to fixed position');
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$module
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.addClass(className.fixed)
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.css({
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position : 'fixed',
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top : settings.offset + 'px',
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left : 'auto',
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zIndex : settings.zIndex
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})
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;
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settings.onFixed.call(element);
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},
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image: function(src, callback) {
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$module
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.attr('src', src)
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;
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if(settings.transition) {
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if( $.fn.transition !== undefined) {
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if($module.hasClass(className.visible)) {
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module.debug('Transition already occurred on this image, skipping animation');
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return;
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}
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$module.transition(settings.transition, settings.duration, callback);
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}
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else {
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$module.fadeIn(settings.duration, callback);
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}
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}
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else {
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$module.show();
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}
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}
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},
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is: {
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onScreen: function() {
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var
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calculations = module.get.elementCalculations()
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;
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return calculations.onScreen;
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},
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offScreen: function() {
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var
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calculations = module.get.elementCalculations()
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;
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return calculations.offScreen;
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},
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visible: function() {
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if(module.cache && module.cache.element) {
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return !(module.cache.element.width === 0 && module.cache.element.offset.top === 0);
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}
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return false;
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},
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verticallyScrollableContext: function() {
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var
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overflowY = ($context.get(0) !== window)
|
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? $context.css('overflow-y')
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: false
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;
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return (overflowY == 'auto' || overflowY == 'scroll');
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},
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horizontallyScrollableContext: function() {
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var
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overflowX = ($context.get(0) !== window)
|
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? $context.css('overflow-x')
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: false
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;
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return (overflowX == 'auto' || overflowX == 'scroll');
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}
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},
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refresh: function() {
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module.debug('Refreshing constants (width/height)');
|
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if(settings.type == 'fixed') {
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module.resetFixed();
|
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}
|
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module.reset();
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module.save.position();
|
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if(settings.checkOnRefresh) {
|
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module.checkVisibility();
|
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}
|
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settings.onRefresh.call(element);
|
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},
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resetFixed: function () {
|
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module.remove.fixed();
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module.remove.occurred();
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},
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reset: function() {
|
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module.verbose('Resetting all cached values');
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if( $.isPlainObject(module.cache) ) {
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module.cache.screen = {};
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module.cache.element = {};
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}
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},
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checkVisibility: function(scroll) {
|
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module.verbose('Checking visibility of element', module.cache.element);
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|
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if( !disabled && module.is.visible() ) {
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// save scroll position
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module.save.scroll(scroll);
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// update calculations derived from scroll
|
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module.save.calculations();
|
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// percentage
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module.passed();
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// reverse (must be first)
|
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module.passingReverse();
|
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module.topVisibleReverse();
|
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module.bottomVisibleReverse();
|
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module.topPassedReverse();
|
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module.bottomPassedReverse();
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// one time
|
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module.onScreen();
|
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module.offScreen();
|
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module.passing();
|
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module.topVisible();
|
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module.bottomVisible();
|
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module.topPassed();
|
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module.bottomPassed();
|
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|
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// on update callback
|
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if(settings.onUpdate) {
|
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settings.onUpdate.call(element, module.get.elementCalculations());
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}
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}
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},
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passed: function(amount, newCallback) {
|
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var
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calculations = module.get.elementCalculations(),
|
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amountInPixels
|
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;
|
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// assign callback
|
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if(amount && newCallback) {
|
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settings.onPassed[amount] = newCallback;
|
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}
|
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else if(amount !== undefined) {
|
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return (module.get.pixelsPassed(amount) > calculations.pixelsPassed);
|
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}
|
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else if(calculations.passing) {
|
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$.each(settings.onPassed, function(amount, callback) {
|
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if(calculations.bottomVisible || calculations.pixelsPassed > module.get.pixelsPassed(amount)) {
|
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module.execute(callback, amount);
|
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}
|
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else if(!settings.once) {
|
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module.remove.occurred(callback);
|
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}
|
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});
|
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}
|
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},
|
|
|
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onScreen: function(newCallback) {
|
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var
|
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calculations = module.get.elementCalculations(),
|
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callback = newCallback || settings.onOnScreen,
|
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callbackName = 'onScreen'
|
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;
|
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if(newCallback) {
|
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module.debug('Adding callback for onScreen', newCallback);
|
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settings.onOnScreen = newCallback;
|
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}
|
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if(calculations.onScreen) {
|
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module.execute(callback, callbackName);
|
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}
|
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else if(!settings.once) {
|
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module.remove.occurred(callbackName);
|
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}
|
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if(newCallback !== undefined) {
|
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return calculations.onOnScreen;
|
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}
|
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},
|
|
|
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offScreen: function(newCallback) {
|
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var
|
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calculations = module.get.elementCalculations(),
|
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callback = newCallback || settings.onOffScreen,
|
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callbackName = 'offScreen'
|
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;
|
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if(newCallback) {
|
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module.debug('Adding callback for offScreen', newCallback);
|
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settings.onOffScreen = newCallback;
|
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}
|
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if(calculations.offScreen) {
|
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module.execute(callback, callbackName);
|
|
}
|
|
else if(!settings.once) {
|
|
module.remove.occurred(callbackName);
|
|
}
|
|
if(newCallback !== undefined) {
|
|
return calculations.onOffScreen;
|
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}
|
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},
|
|
|
|
passing: function(newCallback) {
|
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var
|
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calculations = module.get.elementCalculations(),
|
|
callback = newCallback || settings.onPassing,
|
|
callbackName = 'passing'
|
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;
|
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if(newCallback) {
|
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module.debug('Adding callback for passing', newCallback);
|
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settings.onPassing = newCallback;
|
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}
|
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if(calculations.passing) {
|
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module.execute(callback, callbackName);
|
|
}
|
|
else if(!settings.once) {
|
|
module.remove.occurred(callbackName);
|
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}
|
|
if(newCallback !== undefined) {
|
|
return calculations.passing;
|
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}
|
|
},
|
|
|
|
|
|
topVisible: function(newCallback) {
|
|
var
|
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calculations = module.get.elementCalculations(),
|
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callback = newCallback || settings.onTopVisible,
|
|
callbackName = 'topVisible'
|
|
;
|
|
if(newCallback) {
|
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module.debug('Adding callback for top visible', newCallback);
|
|
settings.onTopVisible = newCallback;
|
|
}
|
|
if(calculations.topVisible) {
|
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module.execute(callback, callbackName);
|
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}
|
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else if(!settings.once) {
|
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module.remove.occurred(callbackName);
|
|
}
|
|
if(newCallback === undefined) {
|
|
return calculations.topVisible;
|
|
}
|
|
},
|
|
|
|
bottomVisible: function(newCallback) {
|
|
var
|
|
calculations = module.get.elementCalculations(),
|
|
callback = newCallback || settings.onBottomVisible,
|
|
callbackName = 'bottomVisible'
|
|
;
|
|
if(newCallback) {
|
|
module.debug('Adding callback for bottom visible', newCallback);
|
|
settings.onBottomVisible = newCallback;
|
|
}
|
|
if(calculations.bottomVisible) {
|
|
module.execute(callback, callbackName);
|
|
}
|
|
else if(!settings.once) {
|
|
module.remove.occurred(callbackName);
|
|
}
|
|
if(newCallback === undefined) {
|
|
return calculations.bottomVisible;
|
|
}
|
|
},
|
|
|
|
topPassed: function(newCallback) {
|
|
var
|
|
calculations = module.get.elementCalculations(),
|
|
callback = newCallback || settings.onTopPassed,
|
|
callbackName = 'topPassed'
|
|
;
|
|
if(newCallback) {
|
|
module.debug('Adding callback for top passed', newCallback);
|
|
settings.onTopPassed = newCallback;
|
|
}
|
|
if(calculations.topPassed) {
|
|
module.execute(callback, callbackName);
|
|
}
|
|
else if(!settings.once) {
|
|
module.remove.occurred(callbackName);
|
|
}
|
|
if(newCallback === undefined) {
|
|
return calculations.topPassed;
|
|
}
|
|
},
|
|
|
|
bottomPassed: function(newCallback) {
|
|
var
|
|
calculations = module.get.elementCalculations(),
|
|
callback = newCallback || settings.onBottomPassed,
|
|
callbackName = 'bottomPassed'
|
|
;
|
|
if(newCallback) {
|
|
module.debug('Adding callback for bottom passed', newCallback);
|
|
settings.onBottomPassed = newCallback;
|
|
}
|
|
if(calculations.bottomPassed) {
|
|
module.execute(callback, callbackName);
|
|
}
|
|
else if(!settings.once) {
|
|
module.remove.occurred(callbackName);
|
|
}
|
|
if(newCallback === undefined) {
|
|
return calculations.bottomPassed;
|
|
}
|
|
},
|
|
|
|
passingReverse: function(newCallback) {
|
|
var
|
|
calculations = module.get.elementCalculations(),
|
|
callback = newCallback || settings.onPassingReverse,
|
|
callbackName = 'passingReverse'
|
|
;
|
|
if(newCallback) {
|
|
module.debug('Adding callback for passing reverse', newCallback);
|
|
settings.onPassingReverse = newCallback;
|
|
}
|
|
if(!calculations.passing) {
|
|
if(module.get.occurred('passing')) {
|
|
module.execute(callback, callbackName);
|
|
}
|
|
}
|
|
else if(!settings.once) {
|
|
module.remove.occurred(callbackName);
|
|
}
|
|
if(newCallback !== undefined) {
|
|
return !calculations.passing;
|
|
}
|
|
},
|
|
|
|
|
|
topVisibleReverse: function(newCallback) {
|
|
var
|
|
calculations = module.get.elementCalculations(),
|
|
callback = newCallback || settings.onTopVisibleReverse,
|
|
callbackName = 'topVisibleReverse'
|
|
;
|
|
if(newCallback) {
|
|
module.debug('Adding callback for top visible reverse', newCallback);
|
|
settings.onTopVisibleReverse = newCallback;
|
|
}
|
|
if(!calculations.topVisible) {
|
|
if(module.get.occurred('topVisible')) {
|
|
module.execute(callback, callbackName);
|
|
}
|
|
}
|
|
else if(!settings.once) {
|
|
module.remove.occurred(callbackName);
|
|
}
|
|
if(newCallback === undefined) {
|
|
return !calculations.topVisible;
|
|
}
|
|
},
|
|
|
|
bottomVisibleReverse: function(newCallback) {
|
|
var
|
|
calculations = module.get.elementCalculations(),
|
|
callback = newCallback || settings.onBottomVisibleReverse,
|
|
callbackName = 'bottomVisibleReverse'
|
|
;
|
|
if(newCallback) {
|
|
module.debug('Adding callback for bottom visible reverse', newCallback);
|
|
settings.onBottomVisibleReverse = newCallback;
|
|
}
|
|
if(!calculations.bottomVisible) {
|
|
if(module.get.occurred('bottomVisible')) {
|
|
module.execute(callback, callbackName);
|
|
}
|
|
}
|
|
else if(!settings.once) {
|
|
module.remove.occurred(callbackName);
|
|
}
|
|
if(newCallback === undefined) {
|
|
return !calculations.bottomVisible;
|
|
}
|
|
},
|
|
|
|
topPassedReverse: function(newCallback) {
|
|
var
|
|
calculations = module.get.elementCalculations(),
|
|
callback = newCallback || settings.onTopPassedReverse,
|
|
callbackName = 'topPassedReverse'
|
|
;
|
|
if(newCallback) {
|
|
module.debug('Adding callback for top passed reverse', newCallback);
|
|
settings.onTopPassedReverse = newCallback;
|
|
}
|
|
if(!calculations.topPassed) {
|
|
if(module.get.occurred('topPassed')) {
|
|
module.execute(callback, callbackName);
|
|
}
|
|
}
|
|
else if(!settings.once) {
|
|
module.remove.occurred(callbackName);
|
|
}
|
|
if(newCallback === undefined) {
|
|
return !calculations.onTopPassed;
|
|
}
|
|
},
|
|
|
|
bottomPassedReverse: function(newCallback) {
|
|
var
|
|
calculations = module.get.elementCalculations(),
|
|
callback = newCallback || settings.onBottomPassedReverse,
|
|
callbackName = 'bottomPassedReverse'
|
|
;
|
|
if(newCallback) {
|
|
module.debug('Adding callback for bottom passed reverse', newCallback);
|
|
settings.onBottomPassedReverse = newCallback;
|
|
}
|
|
if(!calculations.bottomPassed) {
|
|
if(module.get.occurred('bottomPassed')) {
|
|
module.execute(callback, callbackName);
|
|
}
|
|
}
|
|
else if(!settings.once) {
|
|
module.remove.occurred(callbackName);
|
|
}
|
|
if(newCallback === undefined) {
|
|
return !calculations.bottomPassed;
|
|
}
|
|
},
|
|
|
|
execute: function(callback, callbackName) {
|
|
var
|
|
calculations = module.get.elementCalculations(),
|
|
screen = module.get.screenCalculations()
|
|
;
|
|
callback = callback || false;
|
|
if(callback) {
|
|
if(settings.continuous) {
|
|
module.debug('Callback being called continuously', callbackName, calculations);
|
|
callback.call(element, calculations, screen);
|
|
}
|
|
else if(!module.get.occurred(callbackName)) {
|
|
module.debug('Conditions met', callbackName, calculations);
|
|
callback.call(element, calculations, screen);
|
|
}
|
|
}
|
|
module.save.occurred(callbackName);
|
|
},
|
|
|
|
remove: {
|
|
fixed: function() {
|
|
module.debug('Removing fixed position');
|
|
$module
|
|
.removeClass(className.fixed)
|
|
.css({
|
|
position : '',
|
|
top : '',
|
|
left : '',
|
|
zIndex : ''
|
|
})
|
|
;
|
|
settings.onUnfixed.call(element);
|
|
},
|
|
placeholder: function() {
|
|
module.debug('Removing placeholder content');
|
|
if($placeholder) {
|
|
$placeholder.remove();
|
|
}
|
|
},
|
|
occurred: function(callback) {
|
|
if(callback) {
|
|
var
|
|
occurred = module.cache.occurred
|
|
;
|
|
if(occurred[callback] !== undefined && occurred[callback] === true) {
|
|
module.debug('Callback can now be called again', callback);
|
|
module.cache.occurred[callback] = false;
|
|
}
|
|
}
|
|
else {
|
|
module.cache.occurred = {};
|
|
}
|
|
}
|
|
},
|
|
|
|
save: {
|
|
calculations: function() {
|
|
module.verbose('Saving all calculations necessary to determine positioning');
|
|
module.save.direction();
|
|
module.save.screenCalculations();
|
|
module.save.elementCalculations();
|
|
},
|
|
occurred: function(callback) {
|
|
if(callback) {
|
|
if(module.cache.occurred[callback] === undefined || (module.cache.occurred[callback] !== true)) {
|
|
module.verbose('Saving callback occurred', callback);
|
|
module.cache.occurred[callback] = true;
|
|
}
|
|
}
|
|
},
|
|
scroll: function(scrollPosition) {
|
|
scrollPosition = scrollPosition + settings.offset || $context.scrollTop() + settings.offset;
|
|
module.cache.scroll = scrollPosition;
|
|
},
|
|
direction: function() {
|
|
var
|
|
scroll = module.get.scroll(),
|
|
lastScroll = module.get.lastScroll(),
|
|
direction
|
|
;
|
|
if(scroll > lastScroll && lastScroll) {
|
|
direction = 'down';
|
|
}
|
|
else if(scroll < lastScroll && lastScroll) {
|
|
direction = 'up';
|
|
}
|
|
else {
|
|
direction = 'static';
|
|
}
|
|
module.cache.direction = direction;
|
|
return module.cache.direction;
|
|
},
|
|
elementPosition: function() {
|
|
var
|
|
element = module.cache.element,
|
|
screen = module.get.screenSize()
|
|
;
|
|
module.verbose('Saving element position');
|
|
// (quicker than $.extend)
|
|
element.fits = (element.height < screen.height);
|
|
element.offset = $module.offset();
|
|
element.width = $module.outerWidth();
|
|
element.height = $module.outerHeight();
|
|
// compensate for scroll in context
|
|
if(module.is.verticallyScrollableContext()) {
|
|
element.offset.top += $context.scrollTop() - $context.offset().top;
|
|
}
|
|
if(module.is.horizontallyScrollableContext()) {
|
|
element.offset.left += $context.scrollLeft - $context.offset().left;
|
|
}
|
|
// store
|
|
module.cache.element = element;
|
|
return element;
|
|
},
|
|
elementCalculations: function() {
|
|
var
|
|
screen = module.get.screenCalculations(),
|
|
element = module.get.elementPosition()
|
|
;
|
|
// offset
|
|
if(settings.includeMargin) {
|
|
element.margin = {};
|
|
element.margin.top = parseInt($module.css('margin-top'), 10);
|
|
element.margin.bottom = parseInt($module.css('margin-bottom'), 10);
|
|
element.top = element.offset.top - element.margin.top;
|
|
element.bottom = element.offset.top + element.height + element.margin.bottom;
|
|
}
|
|
else {
|
|
element.top = element.offset.top;
|
|
element.bottom = element.offset.top + element.height;
|
|
}
|
|
|
|
// visibility
|
|
element.topPassed = (screen.top >= element.top);
|
|
element.bottomPassed = (screen.top >= element.bottom);
|
|
element.topVisible = (screen.bottom >= element.top) && !element.topPassed;
|
|
element.bottomVisible = (screen.bottom >= element.bottom) && !element.bottomPassed;
|
|
element.pixelsPassed = 0;
|
|
element.percentagePassed = 0;
|
|
|
|
// meta calculations
|
|
element.onScreen = (element.topVisible && !element.bottomPassed);
|
|
element.passing = (element.topPassed && !element.bottomPassed);
|
|
element.offScreen = (!element.onScreen);
|
|
|
|
// passing calculations
|
|
if(element.passing) {
|
|
element.pixelsPassed = (screen.top - element.top);
|
|
element.percentagePassed = (screen.top - element.top) / element.height;
|
|
}
|
|
module.cache.element = element;
|
|
module.verbose('Updated element calculations', element);
|
|
return element;
|
|
},
|
|
screenCalculations: function() {
|
|
var
|
|
scroll = module.get.scroll()
|
|
;
|
|
module.save.direction();
|
|
module.cache.screen.top = scroll;
|
|
module.cache.screen.bottom = scroll + module.cache.screen.height;
|
|
return module.cache.screen;
|
|
},
|
|
screenSize: function() {
|
|
module.verbose('Saving window position');
|
|
module.cache.screen = {
|
|
height: $context.height()
|
|
};
|
|
},
|
|
position: function() {
|
|
module.save.screenSize();
|
|
module.save.elementPosition();
|
|
}
|
|
},
|
|
|
|
get: {
|
|
pixelsPassed: function(amount) {
|
|
var
|
|
element = module.get.elementCalculations()
|
|
;
|
|
if(amount.search('%') > -1) {
|
|
return ( element.height * (parseInt(amount, 10) / 100) );
|
|
}
|
|
return parseInt(amount, 10);
|
|
},
|
|
occurred: function(callback) {
|
|
return (module.cache.occurred !== undefined)
|
|
? module.cache.occurred[callback] || false
|
|
: false
|
|
;
|
|
},
|
|
direction: function() {
|
|
if(module.cache.direction === undefined) {
|
|
module.save.direction();
|
|
}
|
|
return module.cache.direction;
|
|
},
|
|
elementPosition: function() {
|
|
if(module.cache.element === undefined) {
|
|
module.save.elementPosition();
|
|
}
|
|
return module.cache.element;
|
|
},
|
|
elementCalculations: function() {
|
|
if(module.cache.element === undefined) {
|
|
module.save.elementCalculations();
|
|
}
|
|
return module.cache.element;
|
|
},
|
|
screenCalculations: function() {
|
|
if(module.cache.screen === undefined) {
|
|
module.save.screenCalculations();
|
|
}
|
|
return module.cache.screen;
|
|
},
|
|
screenSize: function() {
|
|
if(module.cache.screen === undefined) {
|
|
module.save.screenSize();
|
|
}
|
|
return module.cache.screen;
|
|
},
|
|
scroll: function() {
|
|
if(module.cache.scroll === undefined) {
|
|
module.save.scroll();
|
|
}
|
|
return module.cache.scroll;
|
|
},
|
|
lastScroll: function() {
|
|
if(module.cache.screen === undefined) {
|
|
module.debug('First scroll event, no last scroll could be found');
|
|
return false;
|
|
}
|
|
return module.cache.screen.top;
|
|
}
|
|
},
|
|
|
|
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, 500);
|
|
},
|
|
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 {
|
|
module.error(error.method, query);
|
|
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();
|
|
}
|
|
instance.save.scroll();
|
|
instance.save.calculations();
|
|
module.invoke(query);
|
|
}
|
|
else {
|
|
if(instance !== undefined) {
|
|
instance.invoke('destroy');
|
|
}
|
|
module.initialize();
|
|
}
|
|
})
|
|
;
|
|
|
|
return (returnedValue !== undefined)
|
|
? returnedValue
|
|
: this
|
|
;
|
|
};
|
|
|
|
$.fn.visibility.settings = {
|
|
|
|
name : 'Visibility',
|
|
namespace : 'visibility',
|
|
|
|
debug : false,
|
|
verbose : false,
|
|
performance : true,
|
|
|
|
// whether to use mutation observers to follow changes
|
|
observeChanges : true,
|
|
|
|
// check position immediately on init
|
|
initialCheck : true,
|
|
|
|
// whether to refresh calculations after all page images load
|
|
refreshOnLoad : true,
|
|
|
|
// whether to refresh calculations after page resize event
|
|
refreshOnResize : true,
|
|
|
|
// should call callbacks on refresh event (resize, etc)
|
|
checkOnRefresh : true,
|
|
|
|
// callback should only occur one time
|
|
once : true,
|
|
|
|
// callback should fire continuously whe evaluates to true
|
|
continuous : false,
|
|
|
|
// offset to use with scroll top
|
|
offset : 0,
|
|
|
|
// whether to include margin in elements position
|
|
includeMargin : false,
|
|
|
|
// scroll context for visibility checks
|
|
context : window,
|
|
|
|
// visibility check delay in ms (defaults to animationFrame)
|
|
throttle : false,
|
|
|
|
// special visibility type (image, fixed)
|
|
type : false,
|
|
|
|
// z-index to use with visibility 'fixed'
|
|
zIndex : '10',
|
|
|
|
// image only animation settings
|
|
transition : 'fade in',
|
|
duration : 1000,
|
|
|
|
// array of callbacks for percentage
|
|
onPassed : {},
|
|
|
|
// standard callbacks
|
|
onOnScreen : false,
|
|
onOffScreen : false,
|
|
onPassing : false,
|
|
onTopVisible : false,
|
|
onBottomVisible : false,
|
|
onTopPassed : false,
|
|
onBottomPassed : false,
|
|
|
|
// reverse callbacks
|
|
onPassingReverse : false,
|
|
onTopVisibleReverse : false,
|
|
onBottomVisibleReverse : false,
|
|
onTopPassedReverse : false,
|
|
onBottomPassedReverse : false,
|
|
|
|
// special callbacks for image
|
|
onLoad : function() {},
|
|
onAllLoaded : function() {},
|
|
|
|
// special callbacks for fixed position
|
|
onFixed : function() {},
|
|
onUnfixed : function() {},
|
|
|
|
// utility callbacks
|
|
onUpdate : false, // disabled by default for performance
|
|
onRefresh : function(){},
|
|
|
|
metadata : {
|
|
src: 'src'
|
|
},
|
|
|
|
className: {
|
|
fixed : 'fixed',
|
|
placeholder : 'placeholder',
|
|
visible : 'visible'
|
|
},
|
|
|
|
error : {
|
|
method : 'The method you called is not defined.',
|
|
visible : 'Element is hidden, you must call refresh after element becomes visible'
|
|
}
|
|
|
|
};
|
|
|
|
})( jQuery, window, document );
|