| /*! |
| * # Semantic UI - Visibility |
| * http://github.com/semantic-org/semantic-ui/ |
| * |
| * |
| * Released under the MIT license |
| * http://opensource.org/licenses/MIT |
| * |
| */ |
| |
| ;(function ($, window, document, undefined) { |
| |
| "use strict"; |
| |
| window = (typeof window != 'undefined' && window.Math == Math) |
| ? window |
| : (typeof self != 'undefined' && self.Math == Math) |
| ? self |
| : Function('return this')() |
| ; |
| |
| $.fn.visibility = function(parameters) { |
| var |
| $allModules = $(this), |
| moduleSelector = $allModules.selector || '', |
| |
| time = new Date().getTime(), |
| performance = [], |
| |
| query = arguments[0], |
| methodInvoked = (typeof query == 'string'), |
| queryArguments = [].slice.call(arguments, 1), |
| returnedValue, |
| |
| moduleCount = $allModules.length, |
| loadedCount = 0 |
| ; |
| |
| $allModules |
| .each(function() { |
| var |
| settings = ( $.isPlainObject(parameters) ) |
| ? $.extend(true, {}, $.fn.visibility.settings, parameters) |
| : $.extend({}, $.fn.visibility.settings), |
| |
| className = settings.className, |
| namespace = settings.namespace, |
| error = settings.error, |
| metadata = settings.metadata, |
| |
| eventNamespace = '.' + namespace, |
| moduleNamespace = 'module-' + namespace, |
| |
| $window = $(window), |
| |
| $module = $(this), |
| $context = $(settings.context), |
| |
| $placeholder, |
| |
| selector = $module.selector || '', |
| instance = $module.data(moduleNamespace), |
| |
| requestAnimationFrame = window.requestAnimationFrame |
| || window.mozRequestAnimationFrame |
| || window.webkitRequestAnimationFrame |
| || window.msRequestAnimationFrame |
| || function(callback) { setTimeout(callback, 0); }, |
| |
| element = this, |
| disabled = false, |
| |
| contextObserver, |
| observer, |
| module |
| ; |
| |
| module = { |
| |
| initialize: function() { |
| module.debug('Initializing', settings); |
| |
| module.setup.cache(); |
| |
| if( module.should.trackChanges() ) { |
| |
| if(settings.type == 'image') { |
| module.setup.image(); |
| } |
| if(settings.type == 'fixed') { |
| module.setup.fixed(); |
| } |
| |
| if(settings.observeChanges) { |
| module.observeChanges(); |
| } |
| module.bind.events(); |
| } |
| |
| module.save.position(); |
| if( !module.is.visible() ) { |
| module.error(error.visible, $module); |
| } |
| |
| if(settings.initialCheck) { |
| module.checkVisibility(); |
| } |
| module.instantiate(); |
| }, |
| |
| instantiate: function() { |
| module.debug('Storing instance', module); |
| $module |
| .data(moduleNamespace, module) |
| ; |
| instance = module; |
| }, |
| |
| destroy: function() { |
| module.verbose('Destroying previous module'); |
| if(observer) { |
| observer.disconnect(); |
| } |
| if(contextObserver) { |
| contextObserver.disconnect(); |
| } |
| $window |
| .off('load' + eventNamespace, module.event.load) |
| .off('resize' + eventNamespace, module.event.resize) |
| ; |
| $context |
| .off('scroll' + eventNamespace, module.event.scroll) |
| .off('scrollchange' + eventNamespace, module.event.scrollchange) |
| ; |
| if(settings.type == 'fixed') { |
| module.resetFixed(); |
| module.remove.placeholder(); |
| } |
| $module |
| .off(eventNamespace) |
| .removeData(moduleNamespace) |
| ; |
| }, |
| |
| observeChanges: function() { |
| if('MutationObserver' in window) { |
| contextObserver = new MutationObserver(module.event.contextChanged); |
| observer = new MutationObserver(module.event.changed); |
| contextObserver.observe(document, { |
| childList : true, |
| subtree : true |
| }); |
| observer.observe(element, { |
| childList : true, |
| subtree : true |
| }); |
| module.debug('Setting up mutation observer', observer); |
| } |
| }, |
| |
| bind: { |
| events: function() { |
| module.verbose('Binding visibility events to scroll and resize'); |
| if(settings.refreshOnLoad) { |
| $window |
| .on('load' + eventNamespace, module.event.load) |
| ; |
| } |
| $window |
| .on('resize' + eventNamespace, module.event.resize) |
| ; |
| // pub/sub pattern |
| $context |
| .off('scroll' + eventNamespace) |
| .on('scroll' + eventNamespace, module.event.scroll) |
| .on('scrollchange' + eventNamespace, module.event.scrollchange) |
| ; |
| } |
| }, |
| |
| event: { |
| changed: function(mutations) { |
| module.verbose('DOM tree modified, updating visibility calculations'); |
| module.timer = setTimeout(function() { |
| module.verbose('DOM tree modified, updating sticky menu'); |
| module.refresh(); |
| }, 100); |
| }, |
| contextChanged: function(mutations) { |
| [].forEach.call(mutations, function(mutation) { |
| if(mutation.removedNodes) { |
| [].forEach.call(mutation.removedNodes, function(node) { |
| if(node == element || $(node).find(element).length > 0) { |
| module.debug('Element removed from DOM, tearing down events'); |
| module.destroy(); |
| } |
| }); |
| } |
| }); |
| }, |
| resize: function() { |
| module.debug('Window resized'); |
| if(settings.refreshOnResize) { |
| requestAnimationFrame(module.refresh); |
| } |
| }, |
| load: function() { |
| module.debug('Page finished loading'); |
| requestAnimationFrame(module.refresh); |
| }, |
| // publishes scrollchange event on one scroll |
| scroll: function() { |
| if(settings.throttle) { |
| clearTimeout(module.timer); |
| module.timer = setTimeout(function() { |
| $context.triggerHandler('scrollchange' + eventNamespace, [ $context.scrollTop() ]); |
| }, settings.throttle); |
| } |
| else { |
| requestAnimationFrame(function() { |
| $context.triggerHandler('scrollchange' + eventNamespace, [ $context.scrollTop() ]); |
| }); |
| } |
| }, |
| // subscribes to scrollchange |
| scrollchange: function(event, scrollPosition) { |
| module.checkVisibility(scrollPosition); |
| }, |
| }, |
| |
| precache: function(images, callback) { |
| if (!(images instanceof Array)) { |
| images = [images]; |
| } |
| var |
| imagesLength = images.length, |
| loadedCounter = 0, |
| cache = [], |
| cacheImage = document.createElement('img'), |
| handleLoad = function() { |
| loadedCounter++; |
| if (loadedCounter >= images.length) { |
| if ($.isFunction(callback)) { |
| callback(); |
| } |
| } |
| } |
| ; |
| while (imagesLength--) { |
| cacheImage = document.createElement('img'); |
| cacheImage.onload = handleLoad; |
| cacheImage.onerror = handleLoad; |
| cacheImage.src = images[imagesLength]; |
| cache.push(cacheImage); |
| } |
| }, |
| |
| enableCallbacks: function() { |
| module.debug('Allowing callbacks to occur'); |
| disabled = false; |
| }, |
| |
| disableCallbacks: function() { |
| module.debug('Disabling all callbacks temporarily'); |
| disabled = true; |
| }, |
| |
| should: { |
| trackChanges: function() { |
| if(methodInvoked) { |
| module.debug('One time query, no need to bind events'); |
| return false; |
| } |
| module.debug('Callbacks being attached'); |
| return true; |
| } |
| }, |
| |
| setup: { |
| cache: function() { |
| module.cache = { |
| occurred : {}, |
| screen : {}, |
| element : {}, |
| }; |
| }, |
| image: function() { |
| var |
| src = $module.data(metadata.src) |
| ; |
| if(src) { |
| module.verbose('Lazy loading image', src); |
| settings.once = true; |
| settings.observeChanges = false; |
| |
| // show when top visible |
| settings.onOnScreen = function() { |
| module.debug('Image on screen', element); |
| module.precache(src, function() { |
| module.set.image(src, function() { |
| loadedCount++; |
| if(loadedCount == moduleCount) { |
| settings.onAllLoaded.call(this); |
| } |
| settings.onLoad.call(this); |
| }); |
| }); |
| }; |
| } |
| }, |
| fixed: function() { |
| module.debug('Setting up fixed'); |
| settings.once = false; |
| settings.observeChanges = false; |
| settings.initialCheck = true; |
| settings.refreshOnLoad = true; |
| if(!parameters.transition) { |
| settings.transition = false; |
| } |
| module.create.placeholder(); |
| module.debug('Added placeholder', $placeholder); |
| settings.onTopPassed = function() { |
| module.debug('Element passed, adding fixed position', $module); |
| module.show.placeholder(); |
| module.set.fixed(); |
| if(settings.transition) { |
| if($.fn.transition !== undefined) { |
| $module.transition(settings.transition, settings.duration); |
| } |
| } |
| }; |
| settings.onTopPassedReverse = function() { |
| module.debug('Element returned to position, removing fixed', $module); |
| module.hide.placeholder(); |
| module.remove.fixed(); |
| }; |
| } |
| }, |
| |
| create: { |
| placeholder: function() { |
| module.verbose('Creating fixed position placeholder'); |
| $placeholder = $module |
| .clone(false) |
| .css('display', 'none') |
| .addClass(className.placeholder) |
| .insertAfter($module) |
| ; |
| } |
| }, |
| |
| show: { |
| placeholder: function() { |
| module.verbose('Showing placeholder'); |
| $placeholder |
| .css('display', 'block') |
| .css('visibility', 'hidden') |
| ; |
| } |
| }, |
| hide: { |
| placeholder: function() { |
| module.verbose('Hiding placeholder'); |
| $placeholder |
| .css('display', 'none') |
| .css('visibility', '') |
| ; |
| } |
| }, |
| |
| set: { |
| fixed: function() { |
| module.verbose('Setting element to fixed position'); |
| $module |
| .addClass(className.fixed) |
| .css({ |
| position : 'fixed', |
| top : settings.offset + 'px', |
| left : 'auto', |
| zIndex : settings.zIndex |
| }) |
| ; |
| settings.onFixed.call(element); |
| }, |
| image: function(src, callback) { |
| $module |
| .attr('src', src) |
| ; |
| if(settings.transition) { |
| if( $.fn.transition !== undefined ) { |
| $module.transition(settings.transition, settings.duration, callback); |
| } |
| else { |
| $module.fadeIn(settings.duration, callback); |
| } |
| } |
| else { |
| $module.show(); |
| } |
| } |
| }, |
| |
| is: { |
| onScreen: function() { |
| var |
| calculations = module.get.elementCalculations() |
| ; |
| return calculations.onScreen; |
| }, |
| offScreen: function() { |
| var |
| calculations = module.get.elementCalculations() |
| ; |
| return calculations.offScreen; |
| }, |
| visible: function() { |
| if(module.cache && module.cache.element) { |
| return !(module.cache.element.width === 0 && module.cache.element.offset.top === 0); |
| } |
| return false; |
| } |
| }, |
| |
| refresh: function() { |
| module.debug('Refreshing constants (width/height)'); |
| if(settings.type == 'fixed') { |
| module.resetFixed(); |
| } |
| module.reset(); |
| module.save.position(); |
| if(settings.checkOnRefresh) { |
| module.checkVisibility(); |
| } |
| settings.onRefresh.call(element); |
| }, |
| |
| resetFixed: function () { |
| module.remove.fixed(); |
| module.remove.occurred(); |
| }, |
| |
| reset: function() { |
| module.verbose('Resetting all cached values'); |
| if( $.isPlainObject(module.cache) ) { |
| module.cache.screen = {}; |
| module.cache.element = {}; |
| } |
| }, |
| |
| checkVisibility: function(scroll) { |
| module.verbose('Checking visibility of element', module.cache.element); |
| |
| if( !disabled && module.is.visible() ) { |
| |
| // save scroll position |
| module.save.scroll(scroll); |
| |
| // update calculations derived from scroll |
| module.save.calculations(); |
| |
| // percentage |
| module.passed(); |
| |
| // reverse (must be first) |
| module.passingReverse(); |
| module.topVisibleReverse(); |
| module.bottomVisibleReverse(); |
| module.topPassedReverse(); |
| module.bottomPassedReverse(); |
| |
| // one time |
| module.onScreen(); |
| module.offScreen(); |
| module.passing(); |
| module.topVisible(); |
| module.bottomVisible(); |
| module.topPassed(); |
| module.bottomPassed(); |
| |
| // on update callback |
| if(settings.onUpdate) { |
| settings.onUpdate.call(element, module.get.elementCalculations()); |
| } |
| } |
| }, |
| |
| passed: function(amount, newCallback) { |
| var |
| calculations = module.get.elementCalculations(), |
| amountInPixels |
| ; |
| // assign callback |
| if(amount && newCallback) { |
| settings.onPassed[amount] = newCallback; |
| } |
| else if(amount !== undefined) { |
| return (module.get.pixelsPassed(amount) > calculations.pixelsPassed); |
| } |
| else if(calculations.passing) { |
| $.each(settings.onPassed, function(amount, callback) { |
| if(calculations.bottomVisible || calculations.pixelsPassed > module.get.pixelsPassed(amount)) { |
| module.execute(callback, amount); |
| } |
| else if(!settings.once) { |
| module.remove.occurred(callback); |
| } |
| }); |
| } |
| }, |
| |
| onScreen: function(newCallback) { |
| var |
| calculations = module.get.elementCalculations(), |
| callback = newCallback || settings.onOnScreen, |
| callbackName = 'onScreen' |
| ; |
| if(newCallback) { |
| module.debug('Adding callback for onScreen', newCallback); |
| settings.onOnScreen = newCallback; |
| } |
| if(calculations.onScreen) { |
| module.execute(callback, callbackName); |
| } |
| else if(!settings.once) { |
| module.remove.occurred(callbackName); |
| } |
| if(newCallback !== undefined) { |
| return calculations.onOnScreen; |
| } |
| }, |
| |
| offScreen: function(newCallback) { |
| var |
| calculations = module.get.elementCalculations(), |
| callback = newCallback || settings.onOffScreen, |
| callbackName = 'offScreen' |
| ; |
| if(newCallback) { |
| module.debug('Adding callback for offScreen', newCallback); |
| settings.onOffScreen = newCallback; |
| } |
| if(calculations.offScreen) { |
| module.execute(callback, callbackName); |
| } |
| else if(!settings.once) { |
| module.remove.occurred(callbackName); |
| } |
| if(newCallback !== undefined) { |
| return calculations.onOffScreen; |
| } |
| }, |
| |
| passing: function(newCallback) { |
| var |
| calculations = module.get.elementCalculations(), |
| callback = newCallback || settings.onPassing, |
| callbackName = 'passing' |
| ; |
| if(newCallback) { |
| module.debug('Adding callback for passing', newCallback); |
| settings.onPassing = newCallback; |
| } |
| if(calculations.passing) { |
| module.execute(callback, callbackName); |
| } |
| else if(!settings.once) { |
| module.remove.occurred(callbackName); |
| } |
| if(newCallback !== undefined) { |
| return calculations.passing; |
| } |
| }, |
| |
| |
| topVisible: function(newCallback) { |
| var |
| calculations = module.get.elementCalculations(), |
| callback = newCallback || settings.onTopVisible, |
| callbackName = 'topVisible' |
| ; |
| if(newCallback) { |
| module.debug('Adding callback for top visible', newCallback); |
| settings.onTopVisible = newCallback; |
| } |
| if(calculations.topVisible) { |
| module.execute(callback, callbackName); |
| } |
| else if(!settings.once) { |
| 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 = $module.outerHeight(); |
| // store |
| module.cache.element = element; |
| return element; |
| }, |
| elementCalculations: function() { |
| var |
| screen = module.get.screenCalculations(), |
| element = module.get.elementPosition() |
| ; |
| // offset |
| if(settings.includeMargin) { |
| element.margin = {}; |
| element.margin.top = parseInt($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.topVisible = (screen.bottom >= element.top); |
| element.topPassed = (screen.top >= element.top); |
| element.bottomVisible = (screen.bottom >= element.bottom); |
| element.bottomPassed = (screen.top >= element.bottom); |
| 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' |
| }, |
| |
| error : { |
| method : 'The method you called is not defined.', |
| visible : 'Element is hidden, you must call refresh after element becomes visible' |
| } |
| |
| }; |
| |
| })( jQuery, window, document ); |
