177 lines
7.1 KiB
HTML
177 lines
7.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>YUI Browser History Manager - Simple Navigation Bar Example</title>
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<link rel="stylesheet" type="text/css" href="../../build/reset-fonts-grids/reset-fonts-grids.css"/>
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<link rel="stylesheet" type="text/css" href="assets/yui-bhm-navbar-demo.css"/>
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</head>
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<body>
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<!-- Static markup required by the browser history utility. Note that the
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iframe is only used on Internet Explorer. If this page is server
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generated (by a PHP script for example), it is a good idea to create
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the IFrame ONLY for Internet Explorer (use server side user agent sniffing) -->
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<iframe id="yui-history-iframe" src="assets/blank.html"></iframe>
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<input id="yui-history-field" type="hidden">
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<!-- Handle the case when client-side scripting is disabled. Note that if
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this page is server generated (by a PHP script for example), you can
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degrade gracefully by using the "section" URL parameter and reload the
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entire page. -->
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<noscript>
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This example requires client-side scripting enabled.
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</noscript>
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<!-- Dependencies -->
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<script src="../../build/yahoo-dom-event/yahoo-dom-event.js"></script>
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<script src="../../build/connection/connection.js"></script>
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<script src="../../build/history/history.js"></script>
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<script>
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(function () {
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var html, bookmarkedSection, querySection, initSection;
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if (location.protocol.substr(0, 4) === "file") {
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document.write('This example cannot be run locally. You must copy it to a web server and access it using HTTP or HTTPS.');
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return;
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}
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html = [];
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html.push('<div id="doc">');
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html.push(' <div id="hd">');
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html.push(' <img src="assets/yui.gif" alt="YUI Logo" id="logo"/>');
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html.push(' <div id="nav">');
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html.push(' <ul>');
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html.push(' <li class="first"><a href="?section=home">Home</a></li>');
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html.push(' <li><a href="?section=overview">Overview</a></li>');
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html.push(' <li><a href="?section=products">Products</a></li>');
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html.push(' <li><a href="?section=aboutus">About Us</a></li>');
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html.push(' <li><a href="?section=contactus">Contact Us</a></li>');
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html.push(' <li class="last"><a href="?section=news">News</a></li>');
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html.push(' </ul>');
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html.push(' </div>');
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html.push(' </div>');
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html.push(' <div id="bd"></div>');
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html.push(' <div id="ft">YUI Browser History Manager - Simple Navigation Bar Example</div>');
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html.push('</div>');
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document.write(html.join(""));
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// This function does an XHR call to load and
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// display the specified section in the page.
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function loadSection(section) {
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var url = "assets/" + section + ".html";
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function successHandler(obj) {
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// Use the response...
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YAHOO.util.Dom.get("bd").innerHTML = obj.responseText;
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}
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function failureHandler(obj) {
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// Fallback...
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location.href = "?section=" + section;
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}
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YAHOO.util.Connect.asyncRequest("GET", url,
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{
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success: successHandler,
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failure: failureHandler
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}
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);
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}
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function initializeNavigationBar() {
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// Process links
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var anchors, i, len, anchor, href, section, currentSection;
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anchors = YAHOO.util.Dom.get("nav").getElementsByTagName("a");
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for (i = 0, len = anchors.length; i < len; i++) {
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anchor = anchors[i];
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YAHOO.util.Event.addListener(anchor, "click", function (evt) {
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href = this.getAttribute("href");
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section = YAHOO.util.History.getQueryStringParameter("section", href) || "home";
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// If the Browser History Manager was not successfuly initialized,
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// the following call to YAHOO.util.History.navigate will throw an
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// exception. We need to catch it and update the UI. The only
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// problem is that this new state will not be added to the browser
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// history.
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//
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// Another solution is to make sure this is an A-grade browser.
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// In that case, under normal circumstances, no exception should
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// be thrown here.
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try {
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YAHOO.util.History.navigate("navbar", section);
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} catch (e) {
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loadSection(section);
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}
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YAHOO.util.Event.preventDefault(evt);
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});
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}
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// This is the tricky part... The window's onload handler is called when the
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// user comes back to your page using the back button. In this case, the
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// actual section that needs to be loaded corresponds to the last section
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// visited before leaving the page, and not the initial section. This can
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// be retrieved using getCurrentState:
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currentSection = YAHOO.util.History.getCurrentState("navbar");
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loadSection(currentSection);
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}
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// The initial section will be chosen in the following order:
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//
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// URL fragment identifier (it will be there if the user previously
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// bookmarked the application in a specific state)
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//
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// or
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//
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// "section" URL parameter (it will be there if the user accessed
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// the site from a search engine result, or did not have scripting
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// enabled when the application was bookmarked in a specific state)
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//
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// or
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//
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// "home" (default)
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bookmarkedSection = YAHOO.util.History.getBookmarkedState("navbar");
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querySection = YAHOO.util.History.getQueryStringParameter("section");
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initSection = bookmarkedSection || querySection || "home";
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// Register our only module. Module registration MUST take place
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// BEFORE calling initializing the browser history management library!
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YAHOO.util.History.register("navbar", initSection, function (state) {
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// This is called after calling YAHOO.util.History.navigate,
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// or after the user has trigerred the back/forward button.
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// We cannot distinguish between these two situations.
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loadSection(state);
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});
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// Use the Browser History Manager onReady method to initialize the application.
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YAHOO.util.History.onReady(function () {
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initializeNavigationBar();
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});
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// Initialize the browser history management library.
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try {
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YAHOO.util.History.initialize("yui-history-field", "yui-history-iframe");
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} catch (e) {
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// The only exception that gets thrown here is when the browser is
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// not supported (Opera, or not A-grade) Degrade gracefully.
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// Note that we have two options here to degrade gracefully:
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// 1) Call initializeNavigationBar. The page will use Ajax/DHTML,
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// but the back/forward buttons will not work.
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// 2) Initialize our module. The page will not use Ajax/DHTML,
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// but the back/forward buttons will work. This is what we
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// chose to do here:
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loadSection(initSection);
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}
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})();
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</script>
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</body>
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</html>
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