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history.js
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/**
* History.js Core
* @author Benjamin Arthur Lupton <[email protected]>
* @copyright 2010-2011 Benjamin Arthur Lupton <[email protected]>
* @license New BSD License <http://creativecommons.org/licenses/BSD/>
*/
(function(window,undefined){
"use strict";
// ========================================================================
// Initialise
// Localise Globals
var
console = window.console||undefined, // Prevent a JSLint complain
document = window.document, // Make sure we are using the correct document
navigator = window.navigator, // Make sure we are using the correct navigator
sessionStorage = window.sessionStorage||false, // sessionStorage
setTimeout = window.setTimeout,
clearTimeout = window.clearTimeout,
setInterval = window.setInterval,
clearInterval = window.clearInterval,
JSON = window.JSON,
alert = window.alert,
History = window.History = window.History||{}, // Public History Object
history = window.history; // Old History Object
// MooTools Compatibility
JSON.stringify = JSON.stringify||JSON.encode;
JSON.parse = JSON.parse||JSON.decode;
// Check Existence
if ( typeof History.init !== 'undefined' ) {
throw new Error('History.js Core has already been loaded...');
}
// Initialise History
History.init = function(){
// Check Load Status of Adapter
if ( typeof History.Adapter === 'undefined' ) {
return false;
}
// Check Load Status of Core
if ( typeof History.initCore !== 'undefined' ) {
History.initCore();
}
// Check Load Status of HTML4 Support
if ( typeof History.initHtml4 !== 'undefined' ) {
History.initHtml4();
}
// Return true
return true;
};
// ========================================================================
// Initialise Core
// Initialise Core
History.initCore = function(){
// Initialise
if ( typeof History.initCore.initialized !== 'undefined' ) {
// Already Loaded
return false;
}
else {
History.initCore.initialized = true;
}
// ====================================================================
// Options
/**
* History.options
* Configurable options
*/
History.options = History.options||{};
/**
* History.options.hashChangeInterval
* How long should the interval be before hashchange checks
*/
History.options.hashChangeInterval = History.options.hashChangeInterval || 100;
/**
* History.options.safariPollInterval
* How long should the interval be before safari poll checks
*/
History.options.safariPollInterval = History.options.safariPollInterval || 500;
/**
* History.options.doubleCheckInterval
* How long should the interval be before we perform a double check
*/
History.options.doubleCheckInterval = History.options.doubleCheckInterval || 500;
/**
* History.options.storeInterval
* How long should we wait between store calls
*/
History.options.storeInterval = History.options.storeInterval || 1000;
/**
* History.options.busyDelay
* How long should we wait between busy events
*/
History.options.busyDelay = History.options.busyDelay || 250;
/**
* History.options.debug
* If true will enable debug messages to be logged
*/
History.options.debug = History.options.debug || false;
/**
* History.options.initialTitle
* What is the title of the initial state
*/
History.options.initialTitle = History.options.initialTitle || document.title;
/**
* History.options.transformHash
* If true will transform the HTML4 hash to HTML5 equivalence. Set to false if you want the hash to be just a plain string, no meaning whatsoever.
*/
History.options.transformHash = History.options.transformHash || true;
// ====================================================================
// Interval record
/**
* History.intervalList
* List of intervals set, to be cleared when document is unloaded.
*/
History.intervalList = [];
/**
* History.clearAllIntervals
* Clears all setInterval instances.
*/
History.clearAllIntervals = function(){
var i, il = History.intervalList;
if (typeof il !== "undefined" && il !== null) {
for (i = 0; i < il.length; i++) {
clearInterval(il[i]);
}
History.intervalList = null;
}
};
// ====================================================================
// Debug
/**
* History.debug(message,...)
* Logs the passed arguments if debug enabled
*/
History.debug = function(){
if ( (History.options.debug||false) ) {
History.log.apply(History,arguments);
}
};
/**
* History.log(message,...)
* Logs the passed arguments
*/
History.log = function(){
// Prepare
var
consoleExists = !(typeof console === 'undefined' || typeof console.log === 'undefined' || typeof console.log.apply === 'undefined'),
textarea = document.getElementById('log'),
message,
i,n,
args,arg
;
// Write to Console
if ( consoleExists ) {
args = Array.prototype.slice.call(arguments);
message = args.shift();
if ( typeof console.debug !== 'undefined' ) {
console.debug.apply(console,[message,args]);
}
else {
console.log.apply(console,[message,args]);
}
}
else {
message = ("\n"+arguments[0]+"\n");
}
// Write to log
for ( i=1,n=arguments.length; i<n; ++i ) {
arg = arguments[i];
if ( typeof arg === 'object' && typeof JSON !== 'undefined' ) {
try {
arg = JSON.stringify(arg);
}
catch ( Exception ) {
// Recursive Object
}
}
message += "\n"+arg+"\n";
}
// Textarea
if ( textarea ) {
textarea.value += message+"\n-----\n";
textarea.scrollTop = textarea.scrollHeight - textarea.clientHeight;
}
// No Textarea, No Console
else if ( !consoleExists ) {
alert(message);
}
// Return true
return true;
};
// ====================================================================
// Emulated Status
/**
* History.getInternetExplorerMajorVersion()
* Get's the major version of Internet Explorer
* @return {integer}
* @license Public Domain
* @author Benjamin Arthur Lupton <[email protected]>
* @author James Padolsey <https://gist.github.com/527683>
*/
History.getInternetExplorerMajorVersion = function(){
var result = History.getInternetExplorerMajorVersion.cached =
(typeof History.getInternetExplorerMajorVersion.cached !== 'undefined')
? History.getInternetExplorerMajorVersion.cached
: (function(){
var v = 3,
div = document.createElement('div'),
all = div.getElementsByTagName('i');
while ( (div.innerHTML = '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->') && all[0] ) {}
return (v > 4) ? v : false;
})()
;
return result;
};
/**
* History.isInternetExplorer()
* Are we using Internet Explorer?
* @return {boolean}
* @license Public Domain
* @author Benjamin Arthur Lupton <[email protected]>
*/
History.isInternetExplorer = function(){
var result =
History.isInternetExplorer.cached =
(typeof History.isInternetExplorer.cached !== 'undefined')
? History.isInternetExplorer.cached
: Boolean(History.getInternetExplorerMajorVersion())
;
return result;
};
/**
* History.emulated
* Which features require emulating?
*/
History.emulated = {
pushState: !Boolean(
window.history && window.history.pushState && window.history.replaceState
&& !(
(/ Mobile\/([1-7][a-z]|(8([abcde]|f(1[0-8]))))/i).test(navigator.userAgent) /* disable for versions of iOS before version 4.3 (8F190) */
|| (/AppleWebKit\/5([0-2]|3[0-2])/i).test(navigator.userAgent) /* disable for the mercury iOS browser, or at least older versions of the webkit engine */
)
),
hashChange: Boolean(
!(('onhashchange' in window) || ('onhashchange' in document))
||
(History.isInternetExplorer() && History.getInternetExplorerMajorVersion() < 8)
)
};
/**
* History.enabled
* Is History enabled?
*/
History.enabled = !History.emulated.pushState;
/**
* History.bugs
* Which bugs are present
*/
History.bugs = {
/**
* Safari 5 and Safari iOS 4 fail to return to the correct state once a hash is replaced by a `replaceState` call
* https://bugs.webkit.org/show_bug.cgi?id=56249
*/
setHash: Boolean(!History.emulated.pushState && navigator.vendor === 'Apple Computer, Inc.' && /AppleWebKit\/5([0-2]|3[0-3])/.test(navigator.userAgent)),
/**
* Safari 5 and Safari iOS 4 sometimes fail to apply the state change under busy conditions
* https://bugs.webkit.org/show_bug.cgi?id=42940
*/
safariPoll: Boolean(!History.emulated.pushState && navigator.vendor === 'Apple Computer, Inc.' && /AppleWebKit\/5([0-2]|3[0-3])/.test(navigator.userAgent)),
/**
* MSIE 6 and 7 sometimes do not apply a hash even it was told to (requiring a second call to the apply function)
*/
ieDoubleCheck: Boolean(History.isInternetExplorer() && History.getInternetExplorerMajorVersion() < 8),
/**
* MSIE 6 requires the entire hash to be encoded for the hashes to trigger the onHashChange event
*/
hashEscape: Boolean(History.isInternetExplorer() && History.getInternetExplorerMajorVersion() < 7)
};
/**
* History.isEmptyObject(obj)
* Checks to see if the Object is Empty
* @param {Object} obj
* @return {boolean}
*/
History.isEmptyObject = function(obj) {
for ( var name in obj ) {
return false;
}
return true;
};
/**
* History.cloneObject(obj)
* Clones a object and eliminate all references to the original contexts
* @param {Object} obj
* @return {Object}
*/
History.cloneObject = function(obj) {
var hash,newObj;
if ( obj ) {
hash = JSON.stringify(obj);
newObj = JSON.parse(hash);
}
else {
newObj = {};
}
return newObj;
};
// ====================================================================
// URL Helpers
/**
* History.getRootUrl()
* Turns "http://mysite.com/dir/page.html?asd" into "http://mysite.com"
* @return {String} rootUrl
*/
History.getRootUrl = function(){
// Create
var rootUrl = document.location.protocol+'//'+(document.location.hostname||document.location.host);
if ( document.location.port||false ) {
rootUrl += ':'+document.location.port;
}
rootUrl += '/';
// Return
return rootUrl;
};
/**
* History.getBaseHref()
* Fetches the `href` attribute of the `<base href="...">` element if it exists
* @return {String} baseHref
*/
History.getBaseHref = function(){
// Create
var
baseElements = document.getElementsByTagName('base'),
baseElement = null,
baseHref = '';
// Test for Base Element
if ( baseElements.length === 1 ) {
// Prepare for Base Element
baseElement = baseElements[0];
baseHref = baseElement.href.replace(/[^\/]+$/,'');
}
// Adjust trailing slash
baseHref = baseHref.replace(/\/+$/,'');
if ( baseHref ) baseHref += '/';
// Return
return baseHref;
};
/**
* History.getBaseUrl()
* Fetches the baseHref or basePageUrl or rootUrl (whichever one exists first)
* @return {String} baseUrl
*/
History.getBaseUrl = function(){
// Create
var baseUrl = History.getBaseHref()||History.getBasePageUrl()||History.getRootUrl();
// Return
return baseUrl;
};
/**
* History.getPageUrl()
* Fetches the URL of the current page
* @return {String} pageUrl
*/
History.getPageUrl = function(){
// Fetch
var
State = History.getState(false,false),
stateUrl = (State||{}).url||document.location.href,
pageUrl;
// Create
pageUrl = stateUrl.replace(/\/+$/,'').replace(/[^\/]+$/,function(part,index,string){
return (/\./).test(part) ? part : part+'/';
});
// Return
return pageUrl;
};
/**
* History.getBasePageUrl()
* Fetches the Url of the directory of the current page
* @return {String} basePageUrl
*/
History.getBasePageUrl = function(){
// Create
var basePageUrl = document.location.href.replace(/[#\?].*/,'').replace(/[^\/]+$/,function(part,index,string){
return (/[^\/]$/).test(part) ? '' : part;
}).replace(/\/+$/,'')+'/';
// Return
return basePageUrl;
};
/**
* History.getFullUrl(url)
* Ensures that we have an absolute URL and not a relative URL
* @param {string} url
* @param {Boolean} allowBaseHref
* @return {string} fullUrl
*/
History.getFullUrl = function(url,allowBaseHref){
// Prepare
var fullUrl = url, firstChar = url.substring(0,1);
allowBaseHref = (typeof allowBaseHref === 'undefined') ? true : allowBaseHref;
// Check
if ( /[a-z]+\:\/\//.test(url) ) {
// Full URL
}
else if ( firstChar === '/' ) {
// Root URL
fullUrl = History.getRootUrl()+url.replace(/^\/+/,'');
}
else if ( firstChar === '#' ) {
// Anchor URL
fullUrl = History.getPageUrl().replace(/#.*/,'')+url;
}
else if ( firstChar === '?' ) {
// Query URL
fullUrl = History.getPageUrl().replace(/[\?#].*/,'')+url;
}
else {
// Relative URL
if ( allowBaseHref ) {
fullUrl = History.getBaseUrl()+url.replace(/^(\.\/)+/,'');
} else {
fullUrl = History.getBasePageUrl()+url.replace(/^(\.\/)+/,'');
}
// We have an if condition above as we do not want hashes
// which are relative to the baseHref in our URLs
// as if the baseHref changes, then all our bookmarks
// would now point to different locations
// whereas the basePageUrl will always stay the same
}
// Return
return fullUrl.replace(/\#$/,'');
};
/**
* History.getShortUrl(url)
* Ensures that we have a relative URL and not a absolute URL
* @param {string} url
* @return {string} url
*/
History.getShortUrl = function(url){
// Prepare
var shortUrl = url, baseUrl = History.getBaseUrl(), rootUrl = History.getRootUrl();
// Trim baseUrl
if ( History.emulated.pushState ) {
// We are in a if statement as when pushState is not emulated
// The actual url these short urls are relative to can change
// So within the same session, we the url may end up somewhere different
shortUrl = shortUrl.replace(baseUrl,'');
}
// Trim rootUrl
shortUrl = shortUrl.replace(rootUrl,'/');
// Ensure we can still detect it as a state
if ( History.isTraditionalAnchor(shortUrl) ) {
shortUrl = './'+shortUrl;
}
// Clean It
shortUrl = shortUrl.replace(/^(\.\/)+/g,'./').replace(/\#$/,'');
// Return
return shortUrl;
};
// ====================================================================
// State Storage
/**
* History.store
* The store for all session specific data
*/
History.store = {};
/**
* History.idToState
* 1-1: State ID to State Object
*/
History.idToState = History.idToState||{};
/**
* History.stateToId
* 1-1: State String to State ID
*/
History.stateToId = History.stateToId||{};
/**
* History.urlToId
* 1-1: State URL to State ID
*/
History.urlToId = History.urlToId||{};
/**
* History.storedStates
* Store the states in an array
*/
History.storedStates = History.storedStates||[];
/**
* History.savedStates
* Saved the states in an array
*/
History.savedStates = History.savedStates||[];
/**
* History.noramlizeStore()
* Noramlize the store by adding necessary values
*/
History.normalizeStore = function(){
History.store.idToState = History.store.idToState||{};
History.store.urlToId = History.store.urlToId||{};
History.store.stateToId = History.store.stateToId||{};
};
/**
* History.getState()
* Get an object containing the data, title and url of the current state
* @param {Boolean} friendly
* @param {Boolean} create
* @return {Object} State
*/
History.getState = function(friendly,create){
// Prepare
if ( typeof friendly === 'undefined' ) { friendly = true; }
if ( typeof create === 'undefined' ) { create = true; }
// Fetch
var State = History.getLastSavedState();
// Create
if ( !State && create ) {
State = History.createStateObject();
}
// Adjust
if ( friendly ) {
State = History.cloneObject(State);
State.url = State.cleanUrl||State.url;
}
// Return
return State;
};
/**
* History.getIdByState(State)
* Gets a ID for a State
* @param {State} newState
* @return {String} id
*/
History.getIdByState = function(newState){
// Fetch ID
var id = History.extractId(newState.url),
str;
if ( !id ) {
// Find ID via State String
str = History.getStateString(newState);
if ( typeof History.stateToId[str] !== 'undefined' ) {
id = History.stateToId[str];
}
else if ( typeof History.store.stateToId[str] !== 'undefined' ) {
id = History.store.stateToId[str];
}
else {
// Generate a new ID
while ( true ) {
id = (new Date()).getTime() + String(Math.random()).replace(/\D/g,'');
if ( typeof History.idToState[id] === 'undefined' && typeof History.store.idToState[id] === 'undefined' ) {
break;
}
}
// Apply the new State to the ID
History.stateToId[str] = id;
History.idToState[id] = newState;
}
}
// Return ID
return id;
};
/**
* History.normalizeState(State)
* Expands a State Object
* @param {object} State
* @return {object}
*/
History.normalizeState = function(oldState){
// Variables
var newState, dataNotEmpty;
// Prepare
if ( !oldState || (typeof oldState !== 'object') ) {
oldState = {};
}
// Check
if ( typeof oldState.normalized !== 'undefined' ) {
return oldState;
}
// Adjust
if ( !oldState.data || (typeof oldState.data !== 'object') ) {
oldState.data = {};
}
// ----------------------------------------------------------------
// Create
newState = {};
newState.normalized = true;
newState.title = oldState.title||'';
newState.url = History.getFullUrl(History.unescapeString(oldState.url||document.location.href));
newState.hash = History.getShortUrl(newState.url);
newState.data = History.cloneObject(oldState.data);
// Fetch ID
newState.id = History.getIdByState(newState);
// ----------------------------------------------------------------
// Clean the URL
newState.cleanUrl = newState.url.replace(/\??\&_suid.*/,'');
newState.url = newState.cleanUrl;
// Check to see if we have more than just a url
dataNotEmpty = !History.isEmptyObject(newState.data);
// Apply
if ( newState.title || dataNotEmpty ) {
// Add ID to Hash
newState.hash = History.getShortUrl(newState.url).replace(/\??\&_suid.*/,'');
if ( !/\?/.test(newState.hash) ) {
newState.hash += '?';
}
newState.hash += '&_suid='+newState.id;
}
// Create the Hashed URL
newState.hashedUrl = History.getFullUrl(newState.hash);
// ----------------------------------------------------------------
// Update the URL if we have a duplicate
if ( (History.emulated.pushState || History.bugs.safariPoll) && History.hasUrlDuplicate(newState) ) {
newState.url = newState.hashedUrl;
}
// ----------------------------------------------------------------
// Return
return newState;
};
/**
* History.createStateObject(data,title,url)
* Creates a object based on the data, title and url state params
* @param {object} data
* @param {string} title
* @param {string} url
* @return {object}
*/
History.createStateObject = function(data,title,url){
// Hashify
var State = {
'data': data,
'title': title,
'url': url
};
// Expand the State
State = History.normalizeState(State);
// Return object
return State;
};
/**
* History.getStateById(id)
* Get a state by it's UID
* @param {String} id
*/
History.getStateById = function(id){
// Prepare
id = String(id);
// Retrieve
var State = History.idToState[id] || History.store.idToState[id] || undefined;
// Return State
return State;
};
/**
* Get a State's String
* @param {State} passedState
*/
History.getStateString = function(passedState){
// Prepare
var State, cleanedState, str;
// Fetch
State = History.normalizeState(passedState);
// Clean
cleanedState = {
data: State.data,
title: passedState.title,
url: passedState.url
};
// Fetch
str = JSON.stringify(cleanedState);
// Return
return str;
};
/**
* Get a State's ID
* @param {State} passedState
* @return {String} id
*/
History.getStateId = function(passedState){
// Prepare
var State, id;
// Fetch
State = History.normalizeState(passedState);
// Fetch
id = State.id;
// Return
return id;
};
/**
* History.getHashByState(State)
* Creates a Hash for the State Object
* @param {State} passedState
* @return {String} hash
*/
History.getHashByState = function(passedState){
// Prepare
var State, hash;
// Fetch
State = History.normalizeState(passedState);
// Hash
hash = State.hash;
// Return
return hash;
};
/**
* History.extractId(url_or_hash)
* Get a State ID by it's URL or Hash
* @param {string} url_or_hash
* @return {string} id
*/
History.extractId = function ( url_or_hash ) {
// Prepare
var id,parts,url;
// Extract
parts = /(.*)\&_suid=([0-9]+)$/.exec(url_or_hash);
url = parts ? (parts[1]||url_or_hash) : url_or_hash;
id = parts ? String(parts[2]||'') : '';
// Return
return id||false;
};
/**
* History.isTraditionalAnchor
* Checks to see if the url is a traditional anchor or not
* @param {String} url_or_hash
* @return {Boolean}
*/
History.isTraditionalAnchor = function(url_or_hash){
// Check
var isTraditional = !(/[\/\?\.]/.test(url_or_hash));
// Return
return isTraditional;
};
/**
* History.extractState
* Get a State by it's URL or Hash
* @param {String} url_or_hash
* @return {State|null}
*/
History.extractState = function(url_or_hash,create){
// Prepare
var State = null, id, url;
create = create||false;
// Fetch SUID
id = History.extractId(url_or_hash);
if ( id ) {
State = History.getStateById(id);
}
// Fetch SUID returned no State
if ( !State ) {
// Fetch URL
url = History.getFullUrl(url_or_hash);
// Check URL
id = History.getIdByUrl(url)||false;
if ( id ) {
State = History.getStateById(id);
}
// Create State
if ( !State && create && !History.isTraditionalAnchor(url_or_hash) ) {
State = History.createStateObject(null,null,url);
}
}
// Return
return State;
};
/**
* History.getIdByUrl()
* Get a State ID by a State URL
*/
History.getIdByUrl = function(url){
// Fetch
var id = History.urlToId[url] || History.store.urlToId[url] || undefined;
// Return
return id;
};
/**
* History.getLastSavedState()
* Get an object containing the data, title and url of the current state
* @return {Object} State
*/
History.getLastSavedState = function(){
return History.savedStates[History.savedStates.length-1]||undefined;
};
/**
* History.getLastStoredState()
* Get an object containing the data, title and url of the current state
* @return {Object} State
*/
History.getLastStoredState = function(){
return History.storedStates[History.storedStates.length-1]||undefined;
};
/**
* History.hasUrlDuplicate
* Checks if a Url will have a url conflict
* @param {Object} newState
* @return {Boolean} hasDuplicate
*/
History.hasUrlDuplicate = function(newState) {
// Prepare
var hasDuplicate = false,
oldState;
// Fetch
oldState = History.extractState(newState.url);
// Check
hasDuplicate = oldState && oldState.id !== newState.id;
// Return
return hasDuplicate;
};
/**
* History.storeState
* Store a State
* @param {Object} newState
* @return {Object} newState
*/
History.storeState = function(newState){
// Store the State
History.urlToId[newState.url] = newState.id;
// Push the State
History.storedStates.push(History.cloneObject(newState));
// Return newState
return newState;
};
/**
* History.isLastSavedState(newState)
* Tests to see if the state is the last state
* @param {Object} newState
* @return {boolean} isLast
*/
History.isLastSavedState = function(newState){
// Prepare
var isLast = false,
newId, oldState, oldId;
// Check
if ( History.savedStates.length ) {
newId = newState.id;
oldState = History.getLastSavedState();
oldId = oldState.id;
// Check
isLast = (newId === oldId);
}
// Return
return isLast;
};
/**
* History.saveState
* Push a State
* @param {Object} newState
* @return {boolean} changed
*/
History.saveState = function(newState){
// Check Hash
if ( History.isLastSavedState(newState) ) {
return false;