File: /var/www/vhost/disk-apps/pma.bikenow.co/js/src/microhistory.js
/**
* An implementation of a client-side page cache.
* This object also uses the cache to provide a simple microhistory,
* that is the ability to use the back and forward buttons in the browser
*/
var MicroHistory = {
/**
* @var int The maximum number of pages to keep in the cache
*/
MAX: 6,
/**
* @var object A hash used to prime the cache with data about the initially
* loaded page. This is set in the footer, and then loaded
* by a double-queued event further down this file.
*/
primer: {},
/**
* @var array Stores the content of the cached pages
*/
pages: [],
/**
* @var int The index of the currently loaded page
* This is used to know at which point in the history we are
*/
current: 0,
/**
* Saves a new page in the cache
*
* @param string hash The hash part of the url that is being loaded
* @param array scripts A list of scripts that is required for the page
* @param string menu A hash that links to a menu stored
* in a dedicated menu cache
* @param array params A list of parameters used by CommonParams()
* @param string rel A relationship to the current page:
* 'samepage': Forces the response to be treated as
* the same page as the current one
* 'newpage': Forces the response to be treated as
* a new page
* undefined: Default behaviour, 'samepage' if the
* selflinks of the two pages are the same.
* 'newpage' otherwise
*
* @return void
*/
add: function (hash, scripts, menu, params, rel) {
if (this.pages.length > MicroHistory.MAX) {
// Trim the cache, to the maximum number of allowed entries
// This way we will have a cached menu for every page
for (var i = 0; i < this.pages.length - this.MAX; i++) {
delete this.pages[i];
}
}
while (this.current < this.pages.length) {
// trim the cache if we went back in the history
// and are now going forward again
this.pages.pop();
}
if (rel === 'newpage' ||
(
typeof rel === 'undefined' && (
typeof this.pages[this.current - 1] === 'undefined' ||
this.pages[this.current - 1].hash !== hash
)
)
) {
this.pages.push({
hash: hash,
content: $('#page_content').html(),
scripts: scripts,
selflink: $('#selflink').html(),
menu: menu,
params: params
});
MicroHistory.setUrlHash(this.current, hash);
this.current++;
}
},
/**
* Restores a page from the cache. This is called when the hash
* part of the url changes and it's structure appears to be valid
*
* @param string index Which page from the history to load
*
* @return void
*/
navigate: function (index) {
var localIndex = index;
if (typeof this.pages[localIndex] === 'undefined' ||
typeof this.pages[localIndex].content === 'undefined' ||
typeof this.pages[localIndex].menu === 'undefined' ||
! MicroHistory.menus.get(this.pages[localIndex].menu)
) {
Functions.ajaxShowMessage(
'<div class="alert alert-danger" role="alert">' + Messages.strInvalidPage + '</div>',
false
);
} else {
AJAX.active = true;
var record = this.pages[localIndex];
AJAX.scriptHandler.reset(function () {
$('#page_content').html(record.content);
$('#selflink').html(record.selflink);
MicroHistory.menus.replace(MicroHistory.menus.get(record.menu));
CommonParams.setAll(record.params);
AJAX.scriptHandler.load(record.scripts);
MicroHistory.current = ++localIndex;
});
}
},
/**
* Resaves the content of the current page in the cache.
* Necessary in order not to show the user some outdated version of the page
*
* @return void
*/
update: function () {
var page = this.pages[this.current - 1];
if (page) {
page.content = $('#page_content').html();
}
},
/**
* @var object Dedicated menu cache
*/
menus: {
/**
* Returns the number of items in an associative array
*
* @return int
*/
size: function (obj) {
var size = 0;
var key;
for (key in obj) {
if (obj.hasOwnProperty(key)) {
size++;
}
}
return size;
},
/**
* @var hash Stores the content of the cached menus
*/
data: {},
/**
* Saves a new menu in the cache
*
* @param string hash The hash (trimmed md5) of the menu to be saved
* @param string content The HTML code of the menu to be saved
*
* @return void
*/
add: function (hash, content) {
if (this.size(this.data) > MicroHistory.MAX) {
// when the cache grows, we remove the oldest entry
var oldest;
var key;
var init = 0;
for (var i in this.data) {
if (this.data[i]) {
if (! init || this.data[i].timestamp.getTime() < oldest.getTime()) {
oldest = this.data[i].timestamp;
key = i;
init = 1;
}
}
}
delete this.data[key];
}
this.data[hash] = {
content: content,
timestamp: new Date()
};
},
/**
* Retrieves a menu given its hash
*
* @param string hash The hash of the menu to be retrieved
*
* @return string
*/
get: function (hash) {
if (this.data[hash]) {
return this.data[hash].content;
} else {
// This should never happen as long as the number of stored menus
// is larger or equal to the number of pages in the page cache
return '';
}
},
/**
* Prepares part of the parameter string used during page requests,
* this is necessary to tell the server which menus we have in the cache
*
* @return string
*/
getRequestParam: function () {
var param = '';
var menuHashes = [];
for (var i in this.data) {
menuHashes.push(i);
}
var menuHashesParam = menuHashes.join('-');
if (menuHashesParam) {
param = CommonParams.get('arg_separator') + 'menuHashes=' + menuHashesParam;
}
return param;
},
/**
* Replaces the menu with new content
*
* @return void
*/
replace: function (content) {
$('#floating_menubar').html(content)
// Remove duplicate wrapper
// TODO: don't send it in the response
.children().first().remove();
$('#topmenu').menuResizer(Functions.mainMenuResizerCallback);
}
}
};
/**
* URL hash management module.
* Allows direct bookmarking and microhistory.
*/
MicroHistory.setUrlHash = (function (jQuery, window) {
'use strict';
/**
* Indicates whether we have already completed
* the initialization of the hash
*
* @access private
*/
var ready = false;
/**
* Stores a hash that needed to be set when we were not ready
*
* @access private
*/
var savedHash = '';
/**
* Flag to indicate if the change of hash was triggered
* by a user pressing the back/forward button or if
* the change was triggered internally
*
* @access private
*/
var userChange = true;
// Fix favicon disappearing in Firefox when setting location.hash
function resetFavicon () {
if (navigator.userAgent.indexOf('Firefox') > -1) {
// Move the link tags for the favicon to the bottom
// of the head element to force a reload of the favicon
$('head > link[href="favicon\\.ico"]').appendTo('head');
}
}
/**
* Sets the hash part of the URL
*
* @access public
*/
function setUrlHash (index, hash) {
/*
* Known problem:
* Setting hash leads to reload in webkit:
* https://www.quirksmode.org/bugreports/archives/2005/05/Safari_13_visual_anomaly_with_windowlocationhref.html
*
* so we expect that users are not running an ancient Safari version
*/
userChange = false;
if (ready) {
window.location.hash = 'PMAURL-' + index + ':' + hash;
resetFavicon();
} else {
savedHash = 'PMAURL-' + index + ':' + hash;
}
}
/**
* Start initialization
*/
var urlHash = window.location.hash;
if (urlHash.substring(0, 8) === '#PMAURL-') {
// We have a valid hash, let's redirect the user
// to the page that it's pointing to
var colonPosition = urlHash.indexOf(':');
var questionMarkPosition = urlHash.indexOf('?');
if (colonPosition !== -1 && questionMarkPosition !== -1 && colonPosition < questionMarkPosition) {
var hashUrl = urlHash.substring(colonPosition + 1, questionMarkPosition);
if (hashUrl === 'index.php') {
window.location = urlHash.substring(
colonPosition + 1
);
}
}
} else {
// We don't have a valid hash, so we'll set it up
// when the page finishes loading
jQuery(function () {
/* Check if we should set URL */
if (savedHash !== '') {
window.location.hash = savedHash;
savedHash = '';
resetFavicon();
}
// Indicate that we're done initializing
ready = true;
});
}
/**
* Register an event handler for when the url hash changes
*/
jQuery(function () {
jQuery(window).hashchange(function () {
if (userChange === false) {
// Ignore internally triggered hash changes
userChange = true;
} else if (/^#PMAURL-\d+:/.test(window.location.hash)) {
// Change page if the hash changed was triggered by a user action
var index = window.location.hash.substring(
8, window.location.hash.indexOf(':')
);
MicroHistory.navigate(index);
}
});
});
/**
* Publicly exposes a reference to the otherwise private setUrlHash function
*/
return setUrlHash;
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