AJAX：如何处理书签和后退按钮(2)

/** Our function that initializes when the page
is finished loading. */
function initialize() {
// initialize the DHTML History framework
dhtmlHistory.initialize(); 中.国站长站

// add ourselves as a DHTML History listener
dhtmlHistory.addListener(handleHistoryChange);

// if we haven't retrieved the address book
// yet, grab it and then cache it into our
// history storage
if (window.addressBook == undefined) {
　// Store the address book as a global
　// object.
　// In a real application we would remotely
　// fetch this from a server in the
　// background.
　window.addressBook =
　　["Brad Neuberg 'bkn3@columbia.edu'",
　　"John Doe 'johndoe@example.com'",
　　"Deanna Neuberg 'mom@mom.com'"];

　// cache the address book so it exists
　// even if the user leaves the page and
　// then returns with the back button
　historyStorage.put("addressBook", addressBook);
}
else {
　// fetch the cached address book from
　// the history storage
　window.addressBook = historyStorage.get("addressBook");
} 中.国.站长站

/** Handles history change events. */
function handleHistoryChange(newLocation,
historyData) {
　// if there is no location then display
　// the default, which is the inbox
　if (newLocation == "") {
　　newLocation = "section:inbox";
　}

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　// extract the section to display from
　// the location change; newLocation will
　// begin with the word "section:"
　newLocation = newLocation.replace(/section\:/, "");

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　// update the browser to respond to this
　// DHTML history change
　displayLocation(newLocation, historyData);
} 中国站长.站

/** Displays the given location in the
right-hand side content area. */
function displayLocation(newLocation,sectionData) {
　// get the menu element that was selected
　var selectedElement = document.getElementById(newLocation);

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　// clear out the old selected menu item
　var menu = document.getElementById("menu");
　for (var i = 0; i ＜ menu.childNodes.length; i++) {
　　var currentElement = menu.childNodes[i];
　　// see if this is a DOM Element node
　　if (currentElement.nodeType == 1) {
　　　// clear any class name
　　　currentElement.className = "";
　　}
　}

　// cause the new selected menu item to
　// appear differently in the UI
　selectedElement.className = "selected";

　// display the new section in the right-hand
　// side of the screen; determine what
　// our sectionData is

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　// display the address book differently by
　// using our local address data we cached
　// earlier
　if (newLocation == "addressbook") {
　　// format and display the address book
　　sectionData = "＜p＞Your addressbook:＜/p＞";
　　sectionData += "＜ul＞"; 中国站.长.站

　　// fetch the address book from the cache
　　// if we don't have it yet
　　if (window.addressBook == undefined) {
　　　window.addressBook = historyStorage.get("addressBook");
　　} Www_Chinaz_com

　　// format the address book for display
　　for (var i = 0; i ＜ window.addressBook.length; i++) {
　　　sectionData += "＜li＞"
　　　　+ window.addressBook[i]
　　　　+ "＜/li＞";
　　} 中国站长.站

　　sectionData += "＜/ul＞";
　}

　// If there is no sectionData, then
　// remotely retrieve it; in this example
　// we use fake data for everything but the
　// address book
　if (sectionData == null) {
　　// in a real application we would remotely
　　// fetch this section's content
　　sectionData = "＜p＞This is section: "
+ selectedElement.innerHTML + "＜/p＞";
　}

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　// update the content's title and main text
　var contentTitle = document.getElementById("content-title");
　var contentValue = document.getElementById("content-value");
　contentTitle.innerHTML = selectedElement.innerHTML;
　contentValue.innerHTML = sectionData;
} Chinaz~com