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Copyright 2012 Yahoo! Inc. All rights reserved.
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Licensed under the BSD License.
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http://yuilibrary.com/license/
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YUI.add('pjax-base', function(Y) {
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`Y.Router` extension that provides the core plumbing for enhanced navigation
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implemented using the pjax technique (HTML5 pushState + Ajax).
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var win = Y.config.win,
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// The CSS class name used to filter link clicks from only the links which
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// the pjax enhanced navigation should be used.
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CLASS_PJAX = Y.ClassNameManager.getClassName('pjax'),
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Fired when navigating to a URL via Pjax.
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When the `navigate()` method is called or a pjax link is clicked, this event
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will be fired if the browser supports HTML5 history _and_ the router has a
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route handler for the specified URL.
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This is a useful event to listen to for adding a visual loading indicator
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while the route handlers are busy handling the URL change.
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@param {String} url The URL that the router will dispatch to its route
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handlers in order to fulfill the enhanced navigation "request".
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@param {Boolean} [force=false] Whether the enhanced navigation should occur
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even in browsers without HTML5 history.
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@param {String} [hash] The hash-fragment (including "#") of the `url`. This
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will be present when the `url` differs from the current URL only by its
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hash and `navigateOnHash` has ben set to `true`.
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@param {Event} [originEvent] The event that caused the navigation. Usually
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this would be a click event from a "pjax" anchor element.
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@param {Boolean} [replace] Whether or not the current history entry will be
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replaced, or a new entry will be created. Will default to `true` if the
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specified `url` is the same as the current URL.
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EVT_NAVIGATE = 'navigate';
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`Y.Router` extension that provides the core plumbing for enhanced navigation
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implemented using the pjax technique (HTML5 `pushState` + Ajax).
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This makes it easy to enhance the navigation between the URLs of an application
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in HTML5 history capable browsers by delegating to the router to fulfill the
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"request" and seamlessly falling-back to using standard full-page reloads in
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older, less-capable browsers.
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The `PjaxBase` class isn't useful on its own, but can be mixed into a
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`Router`-based class to add Pjax functionality to that Router. For a pre-made
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standalone Pjax router, see the `Pjax` class.
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var MyRouter = Y.Base.create('myRouter', Y.Router, [Y.PjaxBase], {
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function PjaxBase() {}
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PjaxBase.prototype = {
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// -- Protected Properties -------------------------------------------------
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Holds the delegated pjax-link click handler.
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Regex used to break up a URL string around the URL's path.
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1. Origin, everything before the URL's path-part.
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2. The URL's path-part.
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3. Suffix, everything after the URL's path-part.
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_regexURL: /^((?:[^\/#?:]+:\/\/|\/\/)[^\/]*)?([^?#]*)(\?[^#]*)?(#.*)?$/,
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// -- Lifecycle Methods ----------------------------------------------------
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initializer: function () {
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this.publish(EVT_NAVIGATE, {defaultFn: this._defNavigateFn});
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// Pjax is all about progressively enhancing the navigation between
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// "pages", so by default we only want to handle and route link clicks
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// in HTML5 `pushState`-compatible browsers.
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if (this.get('html5')) {
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destructor: function () {
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this._pjaxEvents && this._pjaxEvents.detach();
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// -- Public Methods -------------------------------------------------------
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Navigates to the specified URL if there is a route handler that matches. In
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browsers capable of using HTML5 history, the navigation will be enhanced by
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firing the `navigate` event and having the router handle the "request".
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Non-HTML5 browsers will navigate to the new URL via manipulation of
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When there is a route handler for the specified URL and it is being
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navigated to, this method will return `true`, otherwise it will return
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**Note:** The specified URL _must_ be of the same origin as the current URL,
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otherwise an error will be logged and navigation will not occur. This is
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intended as both a security constraint and a purposely imposed limitation as
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it does not make sense to tell the router to navigate to a URL on a
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different scheme, host, or port.
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@param {String} url The URL to navigate to. This must be of the same origin
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@param {Object} [options] Additional options to configure the navigation.
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These are mixed into the `navigate` event facade.
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@param {Boolean} [options.replace] Whether or not the current history
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entry will be replaced, or a new entry will be created. Will default
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to `true` if the specified `url` is the same as the current URL.
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@param {Boolean} [options.force=false] Whether the enhanced navigation
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should occur even in browsers without HTML5 history.
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@return {Boolean} `true` if the URL was navigated to, `false` otherwise.
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navigate: function (url, options) {
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// The `_navigate()` method expects fully-resolved URLs.
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url = this._resolveURL(url);
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if (this._navigate(url, options)) {
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if (!this._hasSameOrigin(url)) {
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Y.error('Security error: The new URL must be of the same origin as the current URL.');
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// -- Protected Methods ----------------------------------------------------
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Returns the current path root after popping off the last path segment,
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making it useful for resolving other URL paths against.
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The path root will always begin and end with a '/'.
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@return {String} The URL's path root.
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_getRoot: function () {
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path = Y.getLocation().pathname,
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if (path.charAt(path.length - 1) === slash) {
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segments = path.split(slash);
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return segments.join(slash) + slash;
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Underlying implementation for `navigate()`.
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@param {String} url The fully-resolved URL that the router should dispatch
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to its route handlers to fulfill the enhanced navigation "request", or use
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to update `window.location` in non-HTML5 history capable browsers.
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@param {Object} [options] Additional options to configure the navigation.
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These are mixed into the `navigate` event facade.
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@param {Boolean} [options.replace] Whether or not the current history
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entry will be replaced, or a new entry will be created. Will default
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to `true` if the specified `url` is the same as the current URL.
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@param {Boolean} [options.force=false] Whether the enhanced navigation
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should occur even in browsers without HTML5 history.
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@return {Boolean} `true` if the URL was navigated to, `false` otherwise.
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_navigate: function (url, options) {
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// Navigation can only be enhanced if there is a route-handler.
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if (!this.hasRoute(url)) {
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options || (options = {});
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var currentURL = this._getURL(),
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// Captures the `url`'s hash and returns a URL without that hash.
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hashlessURL = url.replace(/(#.*)$/, function (u, h, i) {
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return u.substring(i);
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if (hash && hashlessURL === currentURL.replace(/#.*$/, '')) {
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// When the specified `url` and current URL only differ by the hash,
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// the browser should handle this in-page navigation normally.
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if (!this.get('navigateOnHash')) {
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// When navigating to the same URL as the current URL, behave like a
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// browser and replace the history entry instead of creating a new one.
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'replace' in options || (options.replace = url === currentURL);
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// The `navigate` event will only fire and therefore enhance the
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// navigation to the new URL in HTML5 history enabled browsers or when
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// forced. Otherwise it will fallback to assigning or replacing the URL
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// on `window.location`.
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if (this.get('html5') || options.force) {
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this.fire(EVT_NAVIGATE, options);
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if (options.replace) {
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win && win.location.replace(url);
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win && (win.location = url);
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Returns a normalized path, ridding it of any '..' segments and properly
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handling leading and trailing slashes.
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@method _normalizePath
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@param {String} path URL path to normalize.
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@return {String} Normalized path.
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_normalizePath: function (path) {
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i, len, normalized, segments, segment, stack;
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if (!path || path === slash) {
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segments = path.split(slash);
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for (i = 0, len = segments.length; i < len; ++i) {
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segment = segments[i];
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if (segment === dots) {
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} else if (segment) {
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normalized = slash + stack.join(slash);
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// Append trailing slash if necessary.
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if (normalized !== slash && path.charAt(path.length - 1) === slash) {
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Binds the delegation of link-click events that match the `linkSelector` to
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the `_onLinkClick()` handler.
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By default this method will only be called if the browser is capable of
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_pjaxBindUI: function () {
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// Only bind link if we haven't already.
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if (!this._pjaxEvents) {
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this._pjaxEvents = Y.one('body').delegate('click',
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this._onLinkClick, this.get('linkSelector'), this);
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Returns the normalized result of resolving the `path` against the current
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path. Falsy values for `path` will return just the current path.
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@param {String} path URL path to resolve.
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@return {String} Resolved path.
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_resolvePath: function (path) {
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return this._getPath();
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// Path is host-relative and assumed to be resolved and normalized,
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// meaning silly paths like: '/foo/../bar/' will be returned as-is.
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if (path.charAt(0) === '/') {
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return this._normalizePath(path);
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return this._normalizePath(this._getRoot() + path);
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Resolves the specified URL against the current URL.
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This method resolves URLs like a browser does and will always return an
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absolute URL. When the specified URL is already absolute, it is assumed to
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be fully resolved and is simply returned as is. Scheme-relative URLs are
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prefixed with the current protocol. Relative URLs are giving the current
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URL's origin and are resolved and normalized against the current path root.
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@param {String} url URL to resolve.
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@return {String} Resolved URL.
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_resolveURL: function (url) {
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var parts = url && url.match(this._regexURL),
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origin, path, query, hash, resolved;
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return this._getURL();
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// Absolute and scheme-relative URLs are assumed to be fully-resolved.
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// Prepend the current scheme for scheme-relative URLs.
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if (origin.indexOf('//') === 0) {
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origin = Y.getLocation().protocol + origin;
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return origin + (path || '/') + (query || '') + (hash || '');
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// Will default to the current origin and current path.
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resolved = this._getOrigin() + this._resolvePath(path);
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// A path or query for the specified URL trumps the current URL's.
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return resolved + (query || '') + (hash || '');
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query = this._getQuery();
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return resolved + (query ? ('?' + query) : '') + (hash || '');
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// -- Protected Event Handlers ---------------------------------------------
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Default handler for the `navigate` event.
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Adds a new history entry or replaces the current entry for the specified URL
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and will scroll the page to the top if configured to do so.
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@method _defNavigateFn
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@param {EventFacade} e
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_defNavigateFn: function (e) {
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this[e.replace ? 'replace' : 'save'](e.url);
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if (win && this.get('scrollToTop')) {
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// Scroll to the top of the page. The timeout ensures that the
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// scroll happens after navigation begins, so that the current
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// scroll position will be restored if the user clicks the back
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setTimeout(function () {
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Handler for delegated link-click events which match the `linkSelector`.
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This will attempt to enhance the navigation to the link element's `href` by
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passing the URL to the `_navigate()` method. When the navigation is being
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enhanced, the default action is prevented.
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If the user clicks a link with the middle/right mouse buttons, or is holding
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down the Ctrl or Command keys, this method's behavior is not applied and
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allows the native behavior to occur. Similarly, if the router is not capable
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or handling the URL because no route-handlers match, the link click will
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@param {EventFacade} e
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_onLinkClick: function (e) {
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// Allow the native behavior on middle/right-click, or when Ctrl or
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// Command are pressed.
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if (e.button !== 1 || e.ctrlKey || e.metaKey) { return; }
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// All browsers fully resolve an anchor's `href` property.
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url = e.currentTarget.get('href');
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// Try and navigate to the URL via the router, and prevent the default
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// link-click action if we do.
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url && this._navigate(url, {originEvent: e}) && e.preventDefault();
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CSS selector string used to filter link click events so that only the links
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which match it will have the enhanced navigation behavior of Pjax applied.
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When a link is clicked and that link matches this selector, Pjax will
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attempt to dispatch to any route handlers matching the link's `href` URL. If
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HTML5 history is not supported or if no route handlers match, the link click
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will be handled by the browser just like any old link.
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@attribute linkSelector
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@type String|Function
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value : 'a.' + CLASS_PJAX,
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writeOnce: 'initOnly'
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Whether navigating to a hash-fragment identifier on the current page should
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be enhanced and cause the `navigate` event to fire.
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By default Pjax allows the browser to perform its default action when a user
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is navigating within a page by clicking in-page links
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(e.g. `<a href="#top">Top of page</a>`) and does not attempt to interfere or
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enhance in-page navigation.
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@attribute navigateOnHash
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Whether the page should be scrolled to the top after navigating to a URL.
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When the user clicks the browser's back button, the previous scroll position
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@attribute scrollToTop
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Y.PjaxBase = PjaxBase;
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}, '3.5.1' ,{requires:['classnamemanager', 'node-event-delegate', 'router']});