/*!
* jQuery hashchange event - v2.0 - 4/18/2020
* http://benalman.com/projects/jquery-hashchange-plugin/
*
* Copyright (c) 2010 "Cowboy" Ben Alman
* Dual licensed under the MIT and GPL licenses.
* http://benalman.com/about/license/
*/
// Script: jQuery hashchange event
//
// *Version: 2.0, Last updated: 4/18/2020*
//
// Project Home - http://benalman.com/projects/jquery-hashchange-plugin/
// GitHub - http://github.com/cowboy/jquery-hashchange/
// Source - http://github.com/cowboy/jquery-hashchange/raw/master/jquery.ba-hashchange.js
// (Minified) - http://github.com/cowboy/jquery-hashchange/raw/master/jquery.ba-hashchange.min.js (0.8kb gzipped)
//
// About: License
//
// Copyright (c) 2010 "Cowboy" Ben Alman,
// Dual licensed under the MIT and GPL licenses.
// http://benalman.com/about/license/
//
// About: Examples
//
// These working examples, complete with fully commented code, illustrate a few
// ways in which this plugin can be used.
//
// hashchange event - http://benalman.com/code/projects/jquery-hashchange/examples/hashchange/
// document.domain - http://benalman.com/code/projects/jquery-hashchange/examples/document_domain/
//
// About: Support and Testing
//
// Information about what version or versions of jQuery this plugin has been
// tested with, what browsers it has been tested in, and where the unit tests
// reside (so you can test it yourself).
//
// jQuery Versions - 1.2.6, 1.3.2, 1.4.1, 1.4.2
// Browsers Tested - Firefox 2-4, Chrome 5-6, Safari 3.2-5,
// Opera 9.6-10.60, iPhone 3.1, Android 1.6-2.2, BlackBerry 4.6-5.
// Unit Tests - http://benalman.com/code/projects/jquery-hashchange/unit/
//
// About: Known issues
//
// While this jQuery hashchange event implementation is quite stable and
// robust, there are a few unfortunate browser bugs surrounding expected
// hashchange event-based behaviors, independent of any JavaScript
// window.onhashchange abstraction. See the following examples for more
// information:
//
// Chrome: Back Button - http://benalman.com/code/projects/jquery-hashchange/examples/bug-chrome-back-button/
// Firefox: Remote XMLHttpRequest - http://benalman.com/code/projects/jquery-hashchange/examples/bug-firefox-remote-xhr/
// WebKit: Back Button in an Iframe - http://benalman.com/code/projects/jquery-hashchange/examples/bug-webkit-hash-iframe/
// Safari: Back Button from a different domain - http://benalman.com/code/projects/jquery-hashchange/examples/bug-safari-back-from-diff-domain/
//
// Also note that should a browser natively support the window.onhashchange
// event, but not report that it does, the fallback polling loop will be used.
//
(function ($, window, undefined) {
'$:nomunge'; // Used by YUI compressor.
// Reused string.
var str_hashchange = 'hashchange',
// Method / object references.
doc = document,
fake_onhashchange,
special = $.event.special,
// Does the browser support window.onhashchange? Note that IE8 running in
// IE7 compatibility mode reports true for 'onhashchange' in window, even
// though the event isn't supported, so also test document.documentMode.
doc_mode = doc.documentMode,
supports_onhashchange = 'on' + str_hashchange in window && (doc_mode === undefined || doc_mode > 7);
// Get location.hash (or what you'd expect location.hash to be) sans any
// leading #. Thanks for making this necessary, Firefox!
function get_fragment(url) {
url = url || location.href;
return '#' + url.replace(/^[^#]*#?(.*)$/, '$1');
};
// Method: jQuery.fn.hashchange
//
// Bind a handler to the window.onhashchange event or trigger all bound
// window.onhashchange event handlers. This behavior is consistent with
// jQuery's built-in event handlers.
//
// Usage:
//
// > jQuery(window).hashchange( [ handler ] );
//
// Arguments:
//
// handler - (Function) Optional handler to be bound to the hashchange
// event. This is a "shortcut" for the more verbose form:
// jQuery(window).bind( 'hashchange', handler ). If handler is omitted,
// all bound window.onhashchange event handlers will be triggered. This
// is a shortcut for the more verbose
// jQuery(window).trigger( 'hashchange' ). These forms are described in
// the <hashchange event> section.
//
// Returns:
//
// (jQuery) The initial jQuery collection of elements.
// Allow the "shortcut" format $(elem).hashchange( fn ) for binding and
// $(elem).hashchange() for triggering, like jQuery does for built-in events.
$.fn[str_hashchange] = function (fn) {
return fn ? this.bind(str_hashchange, fn) : this.trigger(str_hashchange);
};
// Property: jQuery.fn.hashchange.delay
//
// The numeric interval (in milliseconds) at which the <hashchange event>
// polling loop executes. Defaults to 50.
// Property: jQuery.fn.hashchange.domain
//
// If you're setting document.domain in your JavaScript, and you want hash
// history to work in IE6/7, not only must this property be set, but you must
// also set document.domain BEFORE jQuery is loaded into the page. This
// property is only applicable if you are supporting IE6/7 (or IE8 operating
// in "IE7 compatibility" mode).
//
// In addition, the <jQuery.fn.hashchange.src> property must be set to the
// path of the included "document-domain.html" file, which can be renamed or
// modified if necessary (note that the document.domain specified must be the
// same in both your main JavaScript as well as in this file).
//
// Usage:
//
// jQuery.fn.hashchange.domain = document.domain;
// Property: jQuery.fn.hashchange.src
//
// If, for some reason, you need to specify an Iframe src file (for example,
// when setting document.domain as in <jQuery.fn.hashchange.domain>), you can
// do so using this property. Note that when using this property, history
// won't be recorded in IE6/7 until the Iframe src file loads. This property
// is only applicable if you are supporting IE6/7 (or IE8 operating in "IE7
// compatibility" mode).
//
// Usage:
//
// jQuery.fn.hashchange.src = 'path/to/file.html';
$.fn[str_hashchange].delay = 50;
/*
$.fn[ str_hashchange ].domain = null;
$.fn[ str_hashchange ].src = null;
*/
// Event: hashchange event
//
// Fired when location.hash changes. In browsers that support it, the native
// HTML5 window.onhashchange event is used, otherwise a polling loop is
// initialized, running every <jQuery.fn.hashchange.delay> milliseconds to
// see if the hash has changed. In IE6/7 (and IE8 operating in "IE7
// compatibility" mode), a hidden Iframe is created to allow the back button
// and hash-based history to work.
//
// Usage as described in <jQuery.fn.hashchange>:
//
// > // Bind an event handler.
// > jQuery(window).hashchange( function(e) {
// > var hash = location.hash;
// > ...
// > });
// >
// > // Manually trigger the event handler.
// > jQuery(window).hashchange();
//
// A more verbose usage that allows for event namespacing:
//
// > // Bind an event handler.
// > jQuery(window).bind( 'hashchange', function(e) {
// > var hash = location.hash;
// > ...
// > });
// >
// > // Manually trigger the event handler.
// > jQuery(window).trigger( 'hashchange' );
//
// Additional Notes:
//
// * The polling loop and Iframe are not created until at least one handler
// is actually bound to the 'hashchange' event.
// * If you need the bound handler(s) to execute immediately, in cases where
// a location.hash exists on page load, via bookmark or page refresh for
// example, use jQuery(window).hashchange() or the more verbose
// jQuery(window).trigger( 'hashchange' ).
// * The event can be bound before DOM ready, but since it won't be usable
// before then in IE6/7 (due to the necessary Iframe), recommended usage is
// to bind it inside a DOM ready handler.
// Override existing $.event.special.hashchange methods (allowing this plugin
// to be defined after jQuery BBQ in BBQ's source code).
special[str_hashchange] = $.extend(special[str_hashchange], {
// Called only when the first 'hashchange' event is bound to window.
setup: function () {
// If window.onhashchange is supported natively, there's nothing to do..
if (supports_onhashchange) { return false; }
// Otherwise, we need to create our own. And we don't want to call this
// until the user binds to the event, just in case they never do, since it
// will create a polling loop and possibly even a hidden Iframe.
$(fake_onhashchange.start);
},
// Called only when the last 'hashchange' event is unbound from window.
teardown: function () {
// If window.onhashchange is supported natively, there's nothing to do..
if (supports_onhashchange) { return false; }
// Otherwise, we need to stop ours (if possible).
$(fake_onhashchange.stop);
}
});
// fake_onhashchange does all the work of triggering the window.onhashchange
// event for browsers that don't natively support it, including creating a
// polling loop to watch for hash changes and in IE 6/7 creating a hidden
// Iframe to enable back and forward.
fake_onhashchange = (function () {
var self = {},
timeout_id,
// Remember the initial hash so it doesn't get triggered immediately.
last_hash = get_fragment(),
fn_retval = function (val) { return val; },
history_set = fn_retval,
history_get = fn_retval;
// Start the polling loop.
self.start = function () {
timeout_id || poll();
};
// Stop the polling loop.
self.stop = function () {
timeout_id && clearTimeout(timeout_id);
timeout_id = undefined;
};
// This polling loop checks every $.fn.hashchange.delay milliseconds to see
// if location.hash has changed, and triggers the 'hashchange' event on
// window when necessary.
function poll() {
var hash = get_fragment(),
history_hash = history_get(last_hash);
if (hash !== last_hash) {
history_set(last_hash = hash, history_hash);
$(window).trigger(str_hashchange);
} else if (history_hash !== last_hash) {
location.href = location.href.replace(/#.*/, '') + history_hash;
}
timeout_id = setTimeout(poll, $.fn[str_hashchange].delay);
};
return self;
})();
})(jQuery, this);
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