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/*!
* smoothState.js is jQuery plugin that progressively enhances
* page loads to behave more like a single-page application.
*
* @author Miguel Ángel Pérez reachme@miguel-perez.com
* @see http://smoothstate.com
*
*/
(function (factory) {
'use strict';
if(typeof module === 'object' && typeof module.exports === 'object') {
factory(require('jquery'), window, document);
} else {
factory(jQuery, window, document);
}
}(function ( $, window, document, undefined ) {
'use strict';
/** Abort if browser does not support pushState */
if(!window.history.pushState) {
// setup a dummy fn, but don't intercept on link clicks
$.fn.smoothState = function() { return this; };
$.fn.smoothState.options = {};
return;
}
/** Abort if smoothState is already present **/
if($.fn.smoothState) { return; }
var
/** Used later to scroll page to the top */
$body = $('html, body'),
/** Used in debug mode to console out useful warnings */
consl = window.console,
/** Plugin default options, will be exposed as $fn.smoothState.options */
defaults = {
/** If set to true, smoothState will log useful debug information instead of aborting */
debug: false,
/** jQuery selector to specify which anchors smoothState should bind to */
anchors: 'a',
/** Regex to specify which href smoothState should load. If empty, every href will be permitted. */
hrefRegex: '',
/** jQuery selector to specify which forms smoothState should bind to */
forms: 'form',
/** If set to true, smoothState will store form responses in the cache. */
allowFormCaching: false,
/** Minimum number of milliseconds between click/submit events. Events ignored beyond this rate are ignored. */
repeatDelay: 500,
/** A selector that defines what should be ignored by smoothState */
blacklist: '.no-smoothState',
/** If set to true, smoothState will prefetch a link's contents on hover */
prefetch: false,
/** The name of the event we will listen to from anchors if we're prefetching */
prefetchOn: 'mouseover touchstart',
/** jQuery selector to specify elements which should not be prefetched */
prefetchBlacklist: '.no-prefetch',
/** The number of pages smoothState will try to store in memory */
cacheLength: 0,
/** Class that will be applied to the body while the page is loading */
loadingClass: 'is-loading',
/** Scroll to top after onStart and scroll to hash after onReady */
scroll: true,
/**
* A function that can be used to alter the ajax request settings before it is called
* @param {Object} request - jQuery.ajax settings object that will be used to make the request
* @return {Object} Altered request object
*/
alterRequest: function (request) {
return request;
},
/**
* A function that can be used to alter the state object before it is updated or added to the browsers history
* @param {Object} state - An object that will be assigned to history entry
* @param {string} title - The history entry's title. For reference only
* @param {string} url - The history entry's URL. For reference only
* @return {Object} Altered state object
*/
alterChangeState: function (state, title, url) {
return state;
},
/** Run before a page load has been activated */
onBefore: function ($currentTarget, $container) {},
/** Run when a page load has been activated */
onStart: {
duration: 0,
render: function ($container) {}
},
/** Run if the page request is still pending and onStart has finished animating */
onProgress: {
duration: 0,
render: function ($container) {}
},
/** Run when requested content is ready to be injected into the page */
onReady: {
duration: 0,
render: function ($container, $newContent) {
$container.html($newContent);
}
},
/** Run when content has been injected and all animations are complete */
onAfter: function($container, $newContent) {}
},
/** Utility functions that are decoupled from smoothState */
utility = {
/**
* Checks to see if the url is external
* @param {string} url - url being evaluated
* @see http://stackoverflow.com/questions/6238351/fastest-way-to-detect-external-urls
*
*/
isExternal: function (url) {
var match = url.match(/^([^:\/?#]+:)?(?:\/\/([^\/?#]*))?([^?#]+)?(\?[^#]*)?(#.*)?/);
if (typeof match[1] === 'string' && match[1].length > 0 && match[1].toLowerCase() !== window.location.protocol) {
return true;
}
if (typeof match[2] === 'string' &&
match[2].length > 0 &&
match[2].replace(new RegExp(':(' + {'http:': 80, 'https:': 443}[window.location.protocol] +
')?$'), '') !== window.location.host) {
return true;
}
return false;
},
/**
* Strips the hash from a url and returns the new href
* @param {string} href - url being evaluated
*
*/
stripHash: function(href) {
return href.replace(/#.*/, '');
},
/**
* Checks to see if the url is an internal hash
* @param {string} href - url being evaluated
* @param {string} prev - previous url (optional)
*
*/
isHash: function (href, prev) {
prev = prev || window.location.href;
var hasHash = (href.indexOf('#') > -1) ? true : false,
samePath = (utility.stripHash(href) === utility.stripHash(prev)) ? true : false;
return (hasHash && samePath);
},
/**
* Translates a url string into a $.ajax settings obj
* @param {Object|String} request url or settings obj
* @return {Object} settings object
*/
translate: function(request) {
var defaults = {
dataType: 'html',
type: 'GET'
};
if(typeof request === 'string') {
request = $.extend({}, defaults, { url: request });
} else {
request = $.extend({}, defaults, request);
}
return request;
},
/**
* Checks to see if we should be loading this URL
* @param {string} url - url being evaluated
* @param {string} blacklist - jquery selector
*
*/
shouldLoadAnchor: function ($anchor, blacklist, hrefRegex) {
var href = $anchor.prop('href');
// URL will only be loaded if it's not an external link, hash, or
// blacklisted
return (
!utility.isExternal(href) &&
!utility.isHash(href) &&
!$anchor.is(blacklist) &&
!$anchor.prop('target')) &&
(
typeof hrefRegex === undefined ||
hrefRegex === '' ||
$anchor.prop('href').search(hrefRegex) !== -1
);
},
/**
* Resets an object if it has too many properties
*
* This is used to clear the 'cache' object that stores
* all of the html. This would prevent the client from
* running out of memory and allow the user to hit the
* server for a fresh copy of the content.
*
* @param {object} obj
* @param {number} cap
*
*/
clearIfOverCapacity: function (cache, cap) {
// Polyfill Object.keys if it doesn't exist
if (!Object.keys) {
Object.keys = function (obj) {
var keys = [],
k;
for (k in obj) {
if (Object.prototype.hasOwnProperty.call(obj, k)) {
keys.push(k);
}
}
return keys;
};
}
if (Object.keys(cache).length > cap) {
cache = {};
}
return cache;
},
/**
* Stores a document fragment into an object
* @param {object} object - object where it will be stored
* @param {string} url - name of the entry
* @param {string|document} doc - entire html
* @param {string} id - the id of the fragment
* @param {object} state - the history entry's object
* @return {object} updated object store
*/
storePageIn: function (object, url, doc, id, state) {
var $html = $( '<html></html>' ).append( $(doc) );
object[url] = { // Content is indexed by the url
status: 'loaded',
// Stores the title of the page, .first() prevents getting svg titles
title: $html.find('title').first().text(),
html: $html.find('#' + id), // Stores the contents of the page
doc: doc, // Stores the whole page document
state: state, // Stores the history entry for comparisons
};
return object;
},
/**
* Triggers an 'allanimationend' event when all animations are complete
* @param {object} $element - jQuery object that should trigger event
* @param {string} resetOn - which other events to trigger allanimationend on
*
*/
triggerAllAnimationEndEvent: function ($element, resetOn) {
resetOn = ' ' + resetOn || '';
var animationCount = 0,
animationstart = 'animationstart webkitAnimationStart oanimationstart MSAnimationStart',
animationend = 'animationend webkitAnimationEnd oanimationend MSAnimationEnd',
eventname = 'allanimationend',
onAnimationStart = function (e) {
if ($(e.delegateTarget).is($element)) {
e.stopPropagation();
animationCount++;
}
},
onAnimationEnd = function (e) {
if ($(e.delegateTarget).is($element)) {
e.stopPropagation();
animationCount--;
if(animationCount === 0) {
$element.trigger(eventname);
}
}
};
$element.on(animationstart, onAnimationStart);
$element.on(animationend, onAnimationEnd);
$element.on('allanimationend' + resetOn, function(){
animationCount = 0;
utility.redraw($element);
});
},
/** Forces browser to redraw elements */
redraw: function ($element) {
$element.height();
}
},
/** Handles the popstate event, like when the user hits 'back' */
onPopState = function ( e ) {
if(e.state !== null) {
var url = window.location.href,
$page = $('#' + e.state.id),
page = $page.data('smoothState'),
diffUrl = (page.href !== url && !utility.isHash(url, page.href)),
diffState = (e.state !== page.cache[page.href].state);
if(diffUrl || diffState) {
if (diffState) {
page.clear(page.href);
}
page.load(url, false);
}
}
},
/** Constructor function */
Smoothstate = function ( element, options ) {
var
/** Container element smoothState is run on */
$container = $(element),
/** ID of the main container */
elementId = $container.prop('id'),
/** If a hash was clicked, we'll store it here so we
* can scroll to it once the new page has been fully
* loaded.
*/
targetHash = null,
/** Used to prevent fetching while we transition so
* that we don't mistakenly override a cache entry
* we need.
*/
isTransitioning = false,
/** Variable that stores pages after they are requested */
cache = {},
/** Variable that stores data for a history entry */
state = {},
/** Url of the content that is currently displayed */
currentHref = window.location.href,
/**
* Clears a given page from the cache, if no url is provided
* it will clear the entire cache.
* @param {String} url entry that is to be deleted.
*/
clear = function(url) {
url = url || false;
if(url && cache.hasOwnProperty(url)) {
delete cache[url];
} else {
cache = {};
}
$container.data('smoothState').cache = cache;
},
/**
* Fetches the contents of a url and stores it in the 'cache' variable
* @param {String|Object} request - url or request settings object
* @param {Function} callback - function that will run as soon as it finishes
*/
fetch = function (request, callback) {
// Sets a default in case a callback is not defined
callback = callback || $.noop;
// Allows us to accept a url string or object as the ajax settings
var settings = utility.translate(request);
// Check the length of the cache and clear it if needed
cache = utility.clearIfOverCapacity(cache, options.cacheLength);
// Don't prefetch if we have the content already or if it's a form
if(cache.hasOwnProperty(settings.url) && typeof settings.data === 'undefined') {
return;
}
// Let other parts of the code know we're working on getting the content
cache[settings.url] = { status: 'fetching' };
// Make the ajax request
var ajaxRequest = $.ajax(settings);
// Store contents in cache variable if successful
ajaxRequest.done(function (html) {
utility.storePageIn(cache, settings.url, html, elementId);
$container.data('smoothState').cache = cache;
});
// Mark as error to be acted on later
ajaxRequest.fail(function () {
cache[settings.url].status = 'error';
});
// Call fetch callback
if(callback) {
ajaxRequest.always(callback);
}
},
repositionWindow = function(){
// Scroll to a hash anchor on destination page
if(targetHash) {
var $targetHashEl = $(targetHash, $container);
if($targetHashEl.length){
var newPosition = $targetHashEl.offset().top;
$body.scrollTop(newPosition);
}
targetHash = null;
}
},
/** Updates the contents from cache[url] */
updateContent = function (url) {
// If the content has been requested and is done:
var containerId = '#' + elementId,
$newContent = cache[url] ? $(cache[url].html.html()) : null;
if($newContent.length) {
// Update the title
document.title = cache[url].title;
// Update current url
$container.data('smoothState').href = url;
// Remove loading class
if(options.loadingClass) {
$body.removeClass(options.loadingClass);
}
// Call the onReady callback and set delay
options.onReady.render($container, $newContent);
$container.one('ss.onReadyEnd', function(){
// Allow prefetches to be made again
isTransitioning = false;
// Run callback
options.onAfter($container, $newContent);
if (options.scroll) {
repositionWindow();
}
bindPrefetchHandlers($container);
});
window.setTimeout(function(){
$container.trigger('ss.onReadyEnd');
}, options.onReady.duration);
} else if (!$newContent && options.debug && consl) {
// Throw warning to help debug in debug mode
consl.warn('No element with an id of ' + containerId + ' in response from ' + url + ' in ' + cache);
} else {
// No content availble to update with, aborting...
window.location = url;
}
},
/**
* Loads the contents of a url into our container
* @param {string} url
* @param {bool} push - used to determine if we should
* add a new item into the history object
* @param {bool} cacheResponse - used to determine if
* we should allow the cache to forget this
* page after thid load completes.
*/
load = function (request, push, cacheResponse) {
var settings = utility.translate(request);
/** Makes these optional variables by setting defaults. */
if (typeof push === 'undefined') {
push = true;
}
if (typeof cacheResponse === 'undefined') {
cacheResponse = true;
}
var
/** Used to check if the onProgress function has been run */
hasRunCallback = false,
callbBackEnded = false,
/** List of responses for the states of the page request */
responses = {
/** Page is ready, update the content */
loaded: function () {
var eventName = hasRunCallback ? 'ss.onProgressEnd' : 'ss.onStartEnd';
if (!callbBackEnded || !hasRunCallback) {
$container.one(eventName, function(){
updateContent(settings.url);
if (!cacheResponse) {
clear(settings.url);
}
});
}
else if (callbBackEnded) {
updateContent(settings.url);
}
if (push) {
/** Prepare a history entry */
state = options.alterChangeState({ id: elementId }, cache[settings.url].title, settings.url);
/** Update the cache to include the history entry for future comparisons */
cache[settings.url].state = state;
/** Add history entry */
window.history.pushState(state, cache[settings.url].title, settings.url);
}
if (callbBackEnded && !cacheResponse) {
clear(settings.url);
}
},
/** Loading, wait 10 ms and check again */
fetching: function () {
if (!hasRunCallback) {
hasRunCallback = true;
// Run the onProgress callback and set trigger
$container.one('ss.onStartEnd', function(){
// Add loading class
if (options.loadingClass) {
$body.addClass(options.loadingClass);
}
options.onProgress.render($container);
window.setTimeout(function (){
$container.trigger('ss.onProgressEnd');
callbBackEnded = true;
}, options.onProgress.duration);
});
}
window.setTimeout(function () {
// Might of been canceled, better check!
if (cache.hasOwnProperty(settings.url)){
responses[cache[settings.url].status]();
}
}, 10);
},
/** Error, abort and redirect */
error: function (){
if(options.debug && consl) {
consl.log('There was an error loading: ' + settings.url);
} else {
window.location = settings.url;
}
}
};
if (!cache.hasOwnProperty(settings.url)) {
fetch(settings);
}
// Run the onStart callback and set trigger
options.onStart.render($container);
window.setTimeout(function(){
if (options.scroll) {
$body.scrollTop(0);
}
$container.trigger('ss.onStartEnd');
}, options.onStart.duration);
// Start checking for the status of content
responses[cache[settings.url].status]();
},
/**
* Binds to the hover event of a link, used for prefetching content
* @param {object} event
*/
hoverAnchor = function (event) {
var request,
$anchor = $(event.currentTarget);
if (utility.shouldLoadAnchor($anchor, options.blacklist, options.hrefRegex) && !isTransitioning) {
event.stopPropagation();
request = utility.translate($anchor.prop('href'));
request = options.alterRequest(request);
fetch(request);
}
},
/**
* Binds to the click event of a link, used to show the content
* @param {object} event
*/
clickAnchor = function (event) {
// Ctrl (or Cmd) + click must open a new tab
var $anchor = $(event.currentTarget);
if (!event.metaKey && !event.ctrlKey && utility.shouldLoadAnchor($anchor, options.blacklist, options.hrefRegex)) {
// stopPropagation so that event doesn't fire on parent containers.
event.stopPropagation();
event.preventDefault();
// Apply rate limiting.
if (!isRateLimited()) {
// Set the delay timeout until the next event is allowed.
setRateLimitRepeatTime();
var request = utility.translate($anchor.prop('href'));
isTransitioning = true;
targetHash = $anchor.prop('hash');
// Allows modifications to the request
request = options.alterRequest(request);
options.onBefore($anchor, $container);
load(request);
}
}
},
/**
* Binds to form submissions
* @param {Event} event
*/
submitForm = function (event) {
var $form = $(event.currentTarget);
if (!$form.is(options.blacklist)) {
event.preventDefault();
event.stopPropagation();
// Apply rate limiting.
if (!isRateLimited()) {
// Set the delay timeout until the next event is allowed.
setRateLimitRepeatTime();
var request = {
url: $form.prop('action'),
data: $form.serialize(),
type: $form.prop('method')
};
isTransitioning = true;
request = options.alterRequest(request);
if (request.type.toLowerCase() === 'get') {
request.url = request.url + '?' + request.data;
}
// Call the onReady callback and set delay
options.onBefore($form, $container);
load(request, undefined, options.allowFormCaching);
}
}
},
/**
* DigitalMachinist (Jeff Rose)
* I figured to keep these together with this above functions since they're all related.
* Feel free to move these somewhere more appropriate if you have such places.
*/
rateLimitRepeatTime = 0,
isRateLimited = function () {
var isFirstClick = (options.repeatDelay === null);
var isDelayOver = (parseInt(Date.now()) > rateLimitRepeatTime);
return !(isFirstClick || isDelayOver);
},
setRateLimitRepeatTime = function () {
rateLimitRepeatTime = parseInt(Date.now()) + parseInt(options.repeatDelay);
},
/**
* Binds prefetch events
* @param {object} event
*/
bindPrefetchHandlers = function ($element) {
if (options.anchors && options.prefetch) {
$element.find(options.anchors).not(options.prefetchBlacklist).on(options.prefetchOn, null, hoverAnchor);
}
},
/**
* Binds all events and inits functionality
* @param {object} event
*/
bindEventHandlers = function ($element) {
if (options.anchors) {
$element.on('click', options.anchors, clickAnchor);
bindPrefetchHandlers($element);
}
if (options.forms) {
$element.on('submit', options.forms, submitForm);
}
},
/** Restart the container's css animations */
restartCSSAnimations = function () {
var classes = $container.prop('class');
$container.removeClass(classes);
utility.redraw($container);
$container.addClass(classes);
};
/** Merge defaults and global options into current configuration */
options = $.extend( {}, $.fn.smoothState.options, options );
/** Sets a default state */
if(window.history.state === null) {
state = options.alterChangeState({ id: elementId }, document.title, currentHref);
/** Update history entry */
window.history.replaceState(state, document.title, currentHref);
} else {
state = {};
}
/** Stores the current page in cache variable */
utility.storePageIn(cache, currentHref, document.documentElement.outerHTML, elementId, state);
/** Bind all of the event handlers on the container, not anchors */
utility.triggerAllAnimationEndEvent($container, 'ss.onStartEnd ss.onProgressEnd ss.onEndEnd');
/** Bind all of the event handlers on the container, not anchors */
bindEventHandlers($container);
/** Public methods */
return {
href: currentHref,
cache: cache,
clear: clear,
load: load,
fetch: fetch,
restartCSSAnimations: restartCSSAnimations
};
},
/** Returns elements with smoothState attached to it */
declaresmoothState = function ( options ) {
return this.each(function () {
var tagname = this.tagName.toLowerCase();
// Checks to make sure the smoothState element has an id and isn't already bound
if(this.id && tagname !== 'body' && tagname !== 'html' && !$.data(this, 'smoothState')) {
// Makes public methods available via $('element').data('smoothState');
$.data(this, 'smoothState', new Smoothstate(this, options));
} else if (!this.id && consl) {
// Throw warning if in debug mode
consl.warn('Every smoothState container needs an id but the following one does not have one:', this);
} else if ((tagname === 'body' || tagname === 'html') && consl) {
// We dont support making th html or the body element the smoothstate container
consl.warn('The smoothstate container cannot be the ' + this.tagName + ' tag');
}
});
};
/** Sets the popstate function */
window.onpopstate = onPopState;
/** Makes utility functions public for unit tests */
$.smoothStateUtility = utility;
/** Defines the smoothState plugin */
$.fn.smoothState = declaresmoothState;
/* expose the default options */
$.fn.smoothState.options = defaults;
}));