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silverstripe-framework/admin/thirdparty/history-js/scripts/uncompressed/history.js
Ingo Schommer 2debbd37dc Updated history.js dependency
2013-03-20 00:46:32 +01:00

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/**
* History.js Core
* @author Benjamin Arthur Lupton <contact@balupton.com>
* @copyright 2010-2011 Benjamin Arthur Lupton <contact@balupton.com>
* @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
try {
sessionStorage.setItem('TEST', '1');
sessionStorage.removeItem('TEST');
} catch(e) {
sessionStorage = false;
}
// 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(options){
// 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(options){
// 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.disableSuid
* Force History not to append suid
*/
History.options.disableSuid = History.options.disableSuid || false;
/**
* 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.html4Mode
* If true, will force HTMl4 mode (hashtags)
*/
History.options.html4Mode = History.options.html4Mode || false;
/**
* History.options.delayInit
* Want to override default options and call init manually.
*/
History.options.delayInit = History.options.delayInit || false;
// ====================================================================
// 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 <contact@balupton.com>
* @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 <contact@balupton.com>
*/
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?
*/
if (History.options.html4Mode) {
History.emulated = {
pushState : true,
hashChange: true
};
}
else {
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 ) {
if ( obj.hasOwnProperty(name) ) {
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||History.getLocationHref(),
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 = (History.getLocationHref()).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;
};
/**
* History.getLocationHref(document)
* Returns a normalized version of document.location.href
* accounting for browser inconsistencies, etc.
*
* This URL will be URI-encoded and will include the hash
*
* @param {object} document
* @return {string} url
*/
History.getLocationHref = function(doc) {
doc = doc || document;
// most of the time, this will be true
if (doc.URL === doc.location.href)
return doc.location.href;
// some versions of webkit URI-decode document.location.href
// but they leave document.URL in an encoded state
if (doc.location.href === decodeURIComponent(doc.URL))
return doc.URL;
// FF 3.6 only updates document.URL when a page is reloaded
// document.location.href is updated correctly
if (doc.location.hash && decodeURIComponent(doc.location.href.replace(/^[^#]+/, "")) === doc.location.hash)
return doc.location.href;
if (doc.URL.indexOf('#') == -1 && doc.location.href.indexOf('#') != -1)
return doc.location.href;
return doc.URL || doc.location.href;
};
// ====================================================================
// 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(oldState.url?decodeURIComponent(oldState.url):(History.getLocationHref()));
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) && History.options.disableSuid !== true ) {
// 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, tmp;
// Extract
// If the URL has a #, use the id from before the #
if (url_or_hash.indexOf('#') != -1)
{
tmp = url_or_hash.split("#")[0];
}
else
{
tmp = url_or_hash;
}
parts = /(.*)\&_suid=([0-9]+)$/.exec(tmp);
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;
}
// Push the State
History.savedStates.push(History.cloneObject(newState));
// Return true
return true;
};
/**
* History.getStateByIndex()
* Gets a state by the index
* @param {integer} index
* @return {Object}
*/
History.getStateByIndex = function(index){
// Prepare
var State = null;
// Handle
if ( typeof index === 'undefined' ) {
// Get the last inserted
State = History.savedStates[History.savedStates.length-1];
}
else if ( index < 0 ) {
// Get from the end
State = History.savedStates[History.savedStates.length+index];
}
else {
// Get from the beginning
State = History.savedStates[index];
}
// Return State
return State;
};
/**
* History.getCurrentIndex()
* Gets the current index
* @return (integer)
*/
History.getCurrentIndex = function(){
// Prepare
var index = null;
// No states saved
if(History.savedStates.length < 1) {
index = 0;
}
else {
index = History.savedStates.length-1;
}
return index;
};
// ====================================================================
// Hash Helpers
/**
* History.getHash()
* @param {Location=} location
* Gets the current document hash
* Note: unlike location.hash, this is guaranteed to return the escaped hash in all browsers
* @return {string}
*/
History.getHash = function(doc){
var url = History.getLocationHref(doc),
hash;
hash = History.getHashByUrl(url);
return hash;
};
/**
* History.unescapeHash()
* normalize and Unescape a Hash
* @param {String} hash
* @return {string}
*/
History.unescapeHash = function(hash){
// Prepare
var result = History.normalizeHash(hash);
// Unescape hash
result = decodeURIComponent(result);
// Return result
return result;
};
/**
* History.normalizeHash()
* normalize a hash across browsers
* @return {string}
*/
History.normalizeHash = function(hash){
// Prepare
var result = hash.replace(/[^#]*#/,'').replace(/#.*/, '');
// Return result
return result;
};
/**
* History.setHash(hash)
* Sets the document hash
* @param {string} hash
* @return {History}
*/
History.setHash = function(hash,queue){
// Prepare
var State, pageUrl;
// Handle Queueing
if ( queue !== false && History.busy() ) {
// Wait + Push to Queue
//History.debug('History.setHash: we must wait', arguments);
History.pushQueue({
scope: History,
callback: History.setHash,
args: arguments,
queue: queue
});
return false;
}
// Log
//History.debug('History.setHash: called',hash);
// Make Busy + Continue
History.busy(true);
// Check if hash is a state
State = History.extractState(hash,true);
if ( State && !History.emulated.pushState ) {
// Hash is a state so skip the setHash
//History.debug('History.setHash: Hash is a state so skipping the hash set with a direct pushState call',arguments);
// PushState
History.pushState(State.data,State.title,State.url,false);
}
else if ( History.getHash() !== hash ) {
// Hash is a proper hash, so apply it
// Handle browser bugs
if ( History.bugs.setHash ) {
// Fix Safari Bug https://bugs.webkit.org/show_bug.cgi?id=56249
// Fetch the base page
pageUrl = History.getPageUrl();
// Safari hash apply
History.pushState(null,null,pageUrl+'#'+hash,false);
}
else {
// Normal hash apply
document.location.hash = hash;
}
}
// Chain
return History;
};
/**
* History.escape()
* normalize and Escape a Hash
* @return {string}
*/
History.escapeHash = function(hash){
// Prepare
var result = History.normalizeHash(hash);
// Escape hash
result = window.encodeURIComponent(result);
// IE6 Escape Bug
if ( !History.bugs.hashEscape ) {
// Restore common parts
result = result
.replace(/\%21/g,'!')
.replace(/\%26/g,'&')
.replace(/\%3D/g,'=')
.replace(/\%3F/g,'?');
}
// Return result
return result;
};
/**
* History.getHashByUrl(url)
* Extracts the Hash from a URL
* @param {string} url
* @return {string} url
*/
History.getHashByUrl = function(url){
// Extract the hash
var hash = String(url)
.replace(/([^#]*)#?([^#]*)#?(.*)/, '$2')
;
// Unescape hash
hash = History.unescapeHash(hash);
// Return hash
return hash;
};
/**
* History.setTitle(title)
* Applies the title to the document
* @param {State} newState
* @return {Boolean}
*/
History.setTitle = function(newState){
// Prepare
var title = newState.title,
firstState;
// Initial
if ( !title ) {
firstState = History.getStateByIndex(0);
if ( firstState && firstState.url === newState.url ) {
title = firstState.title||History.options.initialTitle;
}
}
// Apply
try {
document.getElementsByTagName('title')[0].innerHTML = title.replace('<','&lt;').replace('>','&gt;').replace(' & ',' &amp; ');
}
catch ( Exception ) { }
document.title = title;
// Chain
return History;
};
// ====================================================================
// Queueing
/**
* History.queues
* The list of queues to use
* First In, First Out
*/
History.queues = [];
/**
* History.busy(value)
* @param {boolean} value [optional]
* @return {boolean} busy
*/
History.busy = function(value){
// Apply
if ( typeof value !== 'undefined' ) {
//History.debug('History.busy: changing ['+(History.busy.flag||false)+'] to ['+(value||false)+']', History.queues.length);
History.busy.flag = value;
}
// Default
else if ( typeof History.busy.flag === 'undefined' ) {
History.busy.flag = false;
}
// Queue
if ( !History.busy.flag ) {
// Execute the next item in the queue
clearTimeout(History.busy.timeout);
var fireNext = function(){
var i, queue, item;
if ( History.busy.flag ) return;
for ( i=History.queues.length-1; i >= 0; --i ) {
queue = History.queues[i];
if ( queue.length === 0 ) continue;
item = queue.shift();
History.fireQueueItem(item);
History.busy.timeout = setTimeout(fireNext,History.options.busyDelay);
}
};
History.busy.timeout = setTimeout(fireNext,History.options.busyDelay);
}
// Return
return History.busy.flag;
};
/**
* History.busy.flag
*/
History.busy.flag = false;
/**
* History.fireQueueItem(item)
* Fire a Queue Item
* @param {Object} item
* @return {Mixed} result
*/
History.fireQueueItem = function(item){
return item.callback.apply(item.scope||History,item.args||[]);
};
/**
* History.pushQueue(callback,args)
* Add an item to the queue
* @param {Object} item [scope,callback,args,queue]
*/
History.pushQueue = function(item){
// Prepare the queue
History.queues[item.queue||0] = History.queues[item.queue||0]||[];
// Add to the queue
History.queues[item.queue||0].push(item);
// Chain
return History;
};
/**
* History.queue (item,queue), (func,queue), (func), (item)
* Either firs the item now if not busy, or adds it to the queue
*/
History.queue = function(item,queue){
// Prepare
if ( typeof item === 'function' ) {
item = {
callback: item
};
}
if ( typeof queue !== 'undefined' ) {
item.queue = queue;
}
// Handle
if ( History.busy() ) {
History.pushQueue(item);
} else {
History.fireQueueItem(item);
}
// Chain
return History;
};
/**
* History.clearQueue()
* Clears the Queue
*/
History.clearQueue = function(){
History.busy.flag = false;
History.queues = [];
return History;
};
// ====================================================================
// IE Bug Fix
/**
* History.stateChanged
* States whether or not the state has changed since the last double check was initialised
*/
History.stateChanged = false;
/**
* History.doubleChecker
* Contains the timeout used for the double checks
*/
History.doubleChecker = false;
/**
* History.doubleCheckComplete()
* Complete a double check
* @return {History}
*/
History.doubleCheckComplete = function(){
// Update
History.stateChanged = true;
// Clear
History.doubleCheckClear();
// Chain
return History;
};
/**
* History.doubleCheckClear()
* Clear a double check
* @return {History}
*/
History.doubleCheckClear = function(){
// Clear
if ( History.doubleChecker ) {
clearTimeout(History.doubleChecker);
History.doubleChecker = false;
}
// Chain
return History;
};
/**
* History.doubleCheck()
* Create a double check
* @return {History}
*/
History.doubleCheck = function(tryAgain){
// Reset
History.stateChanged = false;
History.doubleCheckClear();
// Fix IE6,IE7 bug where calling history.back or history.forward does not actually change the hash (whereas doing it manually does)
// Fix Safari 5 bug where sometimes the state does not change: https://bugs.webkit.org/show_bug.cgi?id=42940
if ( History.bugs.ieDoubleCheck ) {
// Apply Check
History.doubleChecker = setTimeout(
function(){
History.doubleCheckClear();
if ( !History.stateChanged ) {
//History.debug('History.doubleCheck: State has not yet changed, trying again', arguments);
// Re-Attempt
tryAgain();
}
return true;
},
History.options.doubleCheckInterval
);
}
// Chain
return History;
};
// ====================================================================
// Safari Bug Fix
/**
* History.safariStatePoll()
* Poll the current state
* @return {History}
*/
History.safariStatePoll = function(){
// Poll the URL
// Get the Last State which has the new URL
var
urlState = History.extractState(History.getLocationHref()),
newState;
// Check for a difference
if ( !History.isLastSavedState(urlState) ) {
newState = urlState;
}
else {
return;
}
// Check if we have a state with that url
// If not create it
if ( !newState ) {
//History.debug('History.safariStatePoll: new');
newState = History.createStateObject();
}
// Apply the New State
//History.debug('History.safariStatePoll: trigger');
History.Adapter.trigger(window,'popstate');
// Chain
return History;
};
// ====================================================================
// State Aliases
/**
* History.back(queue)
* Send the browser history back one item
* @param {Integer} queue [optional]
*/
History.back = function(queue){
//History.debug('History.back: called', arguments);
// Handle Queueing
if ( queue !== false && History.busy() ) {
// Wait + Push to Queue
//History.debug('History.back: we must wait', arguments);
History.pushQueue({
scope: History,
callback: History.back,
args: arguments,
queue: queue
});
return false;
}
// Make Busy + Continue
History.busy(true);
// Fix certain browser bugs that prevent the state from changing
History.doubleCheck(function(){
History.back(false);
});
// Go back
history.go(-1);
// End back closure
return true;
};
/**
* History.forward(queue)
* Send the browser history forward one item
* @param {Integer} queue [optional]
*/
History.forward = function(queue){
//History.debug('History.forward: called', arguments);
// Handle Queueing
if ( queue !== false && History.busy() ) {
// Wait + Push to Queue
//History.debug('History.forward: we must wait', arguments);
History.pushQueue({
scope: History,
callback: History.forward,
args: arguments,
queue: queue
});
return false;
}
// Make Busy + Continue
History.busy(true);
// Fix certain browser bugs that prevent the state from changing
History.doubleCheck(function(){
History.forward(false);
});
// Go forward
history.go(1);
// End forward closure
return true;
};
/**
* History.go(index,queue)
* Send the browser history back or forward index times
* @param {Integer} queue [optional]
*/
History.go = function(index,queue){
//History.debug('History.go: called', arguments);
// Prepare
var i;
// Handle
if ( index > 0 ) {
// Forward
for ( i=1; i<=index; ++i ) {
History.forward(queue);
}
}
else if ( index < 0 ) {
// Backward
for ( i=-1; i>=index; --i ) {
History.back(queue);
}
}
else {
throw new Error('History.go: History.go requires a positive or negative integer passed.');
}
// Chain
return History;
};
// ====================================================================
// HTML5 State Support
// Non-Native pushState Implementation
if ( History.emulated.pushState ) {
/*
* Provide Skeleton for HTML4 Browsers
*/
// Prepare
var emptyFunction = function(){};
History.pushState = History.pushState||emptyFunction;
History.replaceState = History.replaceState||emptyFunction;
} // History.emulated.pushState
// Native pushState Implementation
else {
/*
* Use native HTML5 History API Implementation
*/
/**
* History.onPopState(event,extra)
* Refresh the Current State
*/
History.onPopState = function(event,extra){
// Prepare
var stateId = false, newState = false, currentHash, currentState;
// Reset the double check
History.doubleCheckComplete();
// Check for a Hash, and handle apporiatly
currentHash = History.getHash();
if ( currentHash ) {
// Expand Hash
currentState = History.extractState(currentHash||History.getLocationHref(),true);
if ( currentState ) {
// We were able to parse it, it must be a State!
// Let's forward to replaceState
//History.debug('History.onPopState: state anchor', currentHash, currentState);
History.replaceState(currentState.data, currentState.title, currentState.url, false);
}
else {
// Traditional Anchor
//History.debug('History.onPopState: traditional anchor', currentHash);
History.Adapter.trigger(window,'anchorchange');
History.busy(false);
}
// We don't care for hashes
History.expectedStateId = false;
return false;
}
// Ensure
stateId = History.Adapter.extractEventData('state',event,extra) || false;
// Fetch State
if ( stateId ) {
// Vanilla: Back/forward button was used
newState = History.getStateById(stateId);
}
else if ( History.expectedStateId ) {
// Vanilla: A new state was pushed, and popstate was called manually
newState = History.getStateById(History.expectedStateId);
}
else {
// Initial State
newState = History.extractState(History.getLocationHref());
}
// The State did not exist in our store
if ( !newState ) {
// Regenerate the State
newState = History.createStateObject(null,null,History.getLocationHref());
}
// Clean
History.expectedStateId = false;
// Check if we are the same state
if ( History.isLastSavedState(newState) ) {
// There has been no change (just the page's hash has finally propagated)
//History.debug('History.onPopState: no change', newState, History.savedStates);
History.busy(false);
return false;
}
// Store the State
History.storeState(newState);
History.saveState(newState);
// Force update of the title
History.setTitle(newState);
// Fire Our Event
History.Adapter.trigger(window,'statechange');
History.busy(false);
// Return true
return true;
};
History.Adapter.bind(window,'popstate',History.onPopState);
/**
* History.pushState(data,title,url)
* Add a new State to the history object, become it, and trigger onpopstate
* We have to trigger for HTML4 compatibility
* @param {object} data
* @param {string} title
* @param {string} url
* @return {true}
*/
History.pushState = function(data,title,url,queue){
//History.debug('History.pushState: called', arguments);
// Check the State
if ( History.getHashByUrl(url) && History.emulated.pushState ) {
throw new Error('History.js does not support states with fragement-identifiers (hashes/anchors).');
}
// Handle Queueing
if ( queue !== false && History.busy() ) {
// Wait + Push to Queue
//History.debug('History.pushState: we must wait', arguments);
History.pushQueue({
scope: History,
callback: History.pushState,
args: arguments,
queue: queue
});
return false;
}
// Make Busy + Continue
History.busy(true);
// Create the newState
var newState = History.createStateObject(data,title,url);
// Check it
if ( History.isLastSavedState(newState) ) {
// Won't be a change
History.busy(false);
}
else {
// Store the newState
History.storeState(newState);
History.expectedStateId = newState.id;
// Push the newState
history.pushState(newState.id,newState.title,newState.url);
// Fire HTML5 Event
History.Adapter.trigger(window,'popstate');
}
// End pushState closure
return true;
};
/**
* History.replaceState(data,title,url)
* Replace the State and trigger onpopstate
* We have to trigger for HTML4 compatibility
* @param {object} data
* @param {string} title
* @param {string} url
* @return {true}
*/
History.replaceState = function(data,title,url,queue){
//History.debug('History.replaceState: called', arguments);
// Check the State
if ( History.getHashByUrl(url) && History.emulated.pushState ) {
throw new Error('History.js does not support states with fragement-identifiers (hashes/anchors).');
}
// Handle Queueing
if ( queue !== false && History.busy() ) {
// Wait + Push to Queue
//History.debug('History.replaceState: we must wait', arguments);
History.pushQueue({
scope: History,
callback: History.replaceState,
args: arguments,
queue: queue
});
return false;
}
// Make Busy + Continue
History.busy(true);
// Create the newState
var newState = History.createStateObject(data,title,url);
// Check it
if ( History.isLastSavedState(newState) ) {
// Won't be a change
History.busy(false);
}
else {
// Store the newState
History.storeState(newState);
History.expectedStateId = newState.id;
// Push the newState
history.replaceState(newState.id,newState.title,newState.url);
// Fire HTML5 Event
History.Adapter.trigger(window,'popstate');
}
// End replaceState closure
return true;
};
} // !History.emulated.pushState
// ====================================================================
// Initialise
/**
* Load the Store
*/
if ( sessionStorage ) {
// Fetch
try {
History.store = JSON.parse(sessionStorage.getItem('History.store'))||{};
}
catch ( err ) {
History.store = {};
}
// Normalize
History.normalizeStore();
}
else {
// Default Load
History.store = {};
History.normalizeStore();
}
/**
* Clear Intervals on exit to prevent memory leaks
*/
History.Adapter.bind(window,"unload",History.clearAllIntervals);
/**
* Create the initial State
*/
History.saveState(History.storeState(History.extractState(History.getLocationHref(),true)));
/**
* Bind for Saving Store
*/
if ( sessionStorage ) {
// When the page is closed
History.onUnload = function(){
// Prepare
var currentStore, item, currentStoreString;
// Fetch
try {
currentStore = JSON.parse(sessionStorage.getItem('History.store'))||{};
}
catch ( err ) {
currentStore = {};
}
// Ensure
currentStore.idToState = currentStore.idToState || {};
currentStore.urlToId = currentStore.urlToId || {};
currentStore.stateToId = currentStore.stateToId || {};
// Sync
for ( item in History.idToState ) {
if ( !History.idToState.hasOwnProperty(item) ) {
continue;
}
currentStore.idToState[item] = History.idToState[item];
}
for ( item in History.urlToId ) {
if ( !History.urlToId.hasOwnProperty(item) ) {
continue;
}
currentStore.urlToId[item] = History.urlToId[item];
}
for ( item in History.stateToId ) {
if ( !History.stateToId.hasOwnProperty(item) ) {
continue;
}
currentStore.stateToId[item] = History.stateToId[item];
}
// Update
History.store = currentStore;
History.normalizeStore();
// In Safari, going into Private Browsing mode causes the
// Session Storage object to still exist but if you try and use
// or set any property/function of it it throws the exception
// "QUOTA_EXCEEDED_ERR: DOM Exception 22: An attempt was made to
// add something to storage that exceeded the quota." infinitely
// every second.
currentStoreString = JSON.stringify(currentStore);
try {
// Store
sessionStorage.setItem('History.store', currentStoreString);
}
catch (e) {
// Workaround for a bug seen on iPads. Sometimes the quota exceeded error comes up and simply
// removing/resetting the storage can work.
if (/QUOTA_EXCEEDED_ERR/.test(e.message)) {
sessionStorage.removeItem('History.store');
sessionStorage.setItem('History.store', currentStoreString);
} else {
throw e;
}
}
};
// For Internet Explorer
History.intervalList.push(setInterval(History.onUnload,History.options.storeInterval));
// For Other Browsers
History.Adapter.bind(window,'beforeunload',History.onUnload);
History.Adapter.bind(window,'unload',History.onUnload);
// Both are enabled for consistency
}
// Non-Native pushState Implementation
if ( !History.emulated.pushState ) {
// Be aware, the following is only for native pushState implementations
// If you are wanting to include something for all browsers
// Then include it above this if block
/**
* Setup Safari Fix
*/
if ( History.bugs.safariPoll ) {
History.intervalList.push(setInterval(History.safariStatePoll, History.options.safariPollInterval));
}
/**
* Ensure Cross Browser Compatibility
*/
if ( navigator.vendor === 'Apple Computer, Inc.' || (navigator.appCodeName||'') === 'Mozilla' ) {
/**
* Fix Safari HashChange Issue
*/
// Setup Alias
History.Adapter.bind(window,'hashchange',function(){
History.Adapter.trigger(window,'popstate');
});
// Initialise Alias
if ( History.getHash() ) {
History.Adapter.onDomLoad(function(){
History.Adapter.trigger(window,'hashchange');
});
}
}
} // !History.emulated.pushState
}; // History.initCore
// Try to Initialise History
if (!History.options || !History.options.delayInit) {
History.init();
}
})(window);
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