一個簡單的仿xp的js下拉菜單
?
border-bottom: #08246b 1px solid;
background-color: #b5bed6;
}
DIV.SubMenu TD
{
font-size: 14px;
padding-top: 2px;
}
xp_menu.js（.js包含文件）
<!--
// menu source code
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// 以下爲建立菜單的部分
//_______________________________________
//菜單條的結構
function menu_bar(name,ico,text,key,tip,skey,type,cmd) {
this.name = name; //名稱
this.ico = ico; //圖標
this.text = text; //文字
this.key = key; //熱鍵
this.tip = tip; //提示
this.skey = skey; //快捷鍵
this.type = type; //命令類型，0爲彈出下級菜單，1爲執行一個命令(跳轉到另一個文件)
this.cmd = cmd; //下級菜單的名稱或命令字符串，根據type的值而定
}
//菜單的結構
function menu(name) {
this.name = name; //名稱
this.bar = new Array(); //所包含的菜單條數組
}
//輸出一已定義的主菜單，橫排的
function popMainMenu(menu,left,top,width,height) {
var strHTML, posLeft, posTop, i;
strHTML = "<div id="http://www.chinaitpower.com/A/2003-09-13/" + menu.name + "' style='left:" + left + ";top:" + top + ";width:" + width + ";height:" + height + "' class='MainMenuBG'>"
document.write (strHTML);
posLeft = 2;
posTop = 1;
for (i=0;i<menu.bar.length;i++) {
strHTML = "<div id="http://www.chinaitpower.com/A/2003-09-13/" + menu.bar[i].name + "' nowrap style='left:" + posLeft + ";top:" + posTop + ";' class='MainMenu' " +
"οnmοuseοver='return menu_onmouseover(this,/"" + menu.bar[i].cmd + "/")' οnmοuseοut='return menu_onmouseout(this)' " +
"οnclick='return menu_onclick(this,/"" + menu.bar[i].cmd + "/")' title="http://www.chinaitpower.com/A/2003-09-13/" + menu.bar[i].tip + "'>" + menu.bar[i].text;
if (menu.bar[i].key!="") {
strHTML += "(<u>" + menu.bar[i].key + "</u>)";
}
strHTML += "</div>";
document.write (strHTML);
posLeft += document.all.item(menu.bar[i].name).offsetWidth + 1;
}
strHTML = "</div>";
document.write (strHTML);
}
//輸出一個已定義的子菜單，豎排的
function popSubMenu(menu) {
var strHTML, posLeft, posTop, i;
strHTML = "<div id="http://www.chinaitpower.com/A/2003-09-13/" + menu.name + "' style='left:20;top:30;width:244;height:300;' class='SubMenuBG'>"
document.write (strHTML);
posLeft = 1;
posTop = 1;
for (i=0;i<menu.bar.length;i++) {
if (menu.bar[i].name!="/-") { //如果名稱不是“/-”，表示是一個普通菜單條
strHTML = "<div id="http://www.chinaitpower.com/A/2003-09-13/" + menu.bar[i].name + "' style='left:" + posLeft + ";top:" + posTop + ";' class='SubMenu' " +
"title="http://www.chinaitpower.com/A/2003-09-13/" + menu.bar[i].tip + "' " +
"οnmοuseοver='return bar_onmouseover(this," + menu.bar[i].type + ",/"" + menu.bar[i].cmd + "/")' " +
"οnmοuseοut='return bar_onmouseout(this," + menu.bar[i].type + ",/"" + menu.bar[i].cmd + "/")' " +
"οnclick='return bar_onclick(this," + menu.bar[i].type + ",/"" + menu.bar[i].cmd + "/")'>" +
" <table border=0 cellspacing=0 cellpadding=0 width=240>" +
" <tr>" +
" <td nowrap align=center width=20 id="http://www.chinaitpower.com/A/2003-09-13/" + menu.bar[i].name + "_ico' class='ico'>";
if (menu.bar[i].ico!="") {
strHTML += "<img border=0 width=16 height=16 src="http://www.chinaitpower.com/A/2003-09-13/" + menu.bar[i].ico + "'>";
}else {
strHTML += " ";
}
strHTML += "</td>" +
" <td nowrap id='" + menu.bar[i].name + "_text' class='text'>" + menu.bar[i].text;
if (menu.bar[i].key!="") { strHTML = strHTML + "(<u>" + menu.bar[i].key + "</u>)"; }
strHTML += "</td>" +
"<td nowrap align=right id='" + menu.bar[i].name + "_skey' class='skey'>";
if (menu.bar[i].skey!="") {
strHTML += menu.bar[i].skey;
}else {
strHTML += " ";
}
strHTML += " </td>" +
" <td nowrap align=center width=20 id='" + menu.bar[i].name + "_sub' class='sub'>";
if (menu.bar[i].type==0) {
strHTML += "→";
}else {
strHTML += " ";
}
strHTML += "</td>" +
" </tr>" +
" </table>" +
"</div>";
document.write (strHTML);
posTop += document.all.item(menu.bar[i].name).offsetHeight;
}else { //如果名稱是“/-”，表示是一條分隔線
strHTML = "<div style='left:" + posLeft + ";top:" + posTop + ";' class='SubMenu'>" +
" <table border=0 cellpadding=0 cellspacing=0 width=240>" +
" <tr>" +
" <td nowrap style='background-color: #dedbd6;' width=21></td>" +
" <td nowrap style='padding-left:5px;padding-top:1px;padding-bottom:1px;'>" +
" <table border=0 cellpadding=0 cellspacing=0 width=100%>" +
" <tr><td height=1 bgcolor='#636563'></td></tr>" +
" </table>" +
" </td>" +
" </tr>" +
" </table>" +
"</div>";
document.write (strHTML);
posTop += 3;
}
}
strHTML = "</div>"
document.write (strHTML);
document.all.item(menu.name).style.height = posTop+3; //重設子菜單背景框
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// 以下爲操縱菜單的部分
//_________________________________________________
function showMenu(menu,submenu) { //顯示一級子菜單
document.all.item(submenu).style.left = menu.parentElement.offsetLeft + menu.offsetLeft + 1; //設置子菜單位置
document.all.item(submenu).style.top = menu.parentElement.offsetTop + menu.offsetTop + menu.offsetHeight -1; //設置子菜單的位置
document.all.item(submenu).style.visibility = "visible"; //顯示子菜單
mnuPrev[mnuPrev.length] = new menuinfo(submenu,1); //將新打開的子菜單的ID加入當前顯示菜單ID數組
}
function showSubMenu(menu,submenu) { //顯示二級及以下子菜單
document.all.item(submenu).style.left = menu.parentElement.offsetLeft + menu.offsetLeft + menu.offsetWidth + 2; //設置子菜單位置
document.all.item(submenu).style.top = menu.parentElement.offsetTop + menu.offsetTop + 1; //設置子菜單的位置
if (document.all.item(submenu).offsetLeft + document.all.item(submenu).offsetWidth > doc_width) {
document.all.item(submenu).style.left = menu.parentElement.offsetLeft - document.all.item(submenu).offsetWidth + 1;
}
if (document.all.item(submenu).offsetTop + document.all.item(submenu).offsetHeight > doc_height) {
document.all.item(submenu).style.top = document.all.item(submenu).offsetTop + menu.offsetHeight - document.all.item(submenu).offsetHeight + 2;
}
document.all.item(submenu).style.visibility = "visible"; //顯示子菜單
mnuPrev[mnuPrev.length] = new menuinfo(submenu,1); //將新打開的子菜單的ID加入當前顯示菜單ID數組
}
function showstatus() { //測試階段用的函數，顯示當前菜單ID數組內的內容
lblMsg.innerText = "";
for(var i=0;i<mnuPrev.length;i++) {
lblMsg.innerText += mnuPrev[i].id + " > ";
}
}
function menuinfo(id,type) {
this.id = id; //0表示菜單項，1表示菜單框
this.type = type;
}
function menu_onmouseover(obj,cmd) {
if(!mClick) {
obj.className = "MainMenuOver";
mnuPrev[mnuPrev.length] = new menuinfo(obj.id,0); //將當前的菜單ID壓入當前菜單ID數組
//showstatus(); //調試階段使用
}else {
if (mnuPrev[0].id == obj.id) { return false; } //如果是在本身上移動，不作爲
document.all.item(mnuPrev[0].id).className = "MainMenu";
for (var i=1;i<mnuPrev.length;i++) {
if (mnuPrev[i].type==0) { //如果是菜單項，設置成默認樣式
document.all.item(mnuPrev[i].id + "_ico").className = "ico";
document.all.item(mnuPrev[i].id + "_text").className = "text";
document.all.item(mnuPrev[i].id + "_skey").className = "skey";
document.all.item(mnuPrev[i].id + "_sub").className = "sub";
}else { //如果是菜單框，隱藏它
document.all.item(mnuPrev[i].id).style.visibility = "hidden";
}
}
mnuPrev.length = 0;
obj.className = "MainMenuClick";
mnuPrev[mnuPrev.length] = new menuinfo(obj.id,0);
showMenu(obj,cmd);
//showstatus(); //調試階段使用
}
}
function menu_onmouseout(obj) {
if(!mClick) {
obj.className = "MainMenu";
mnuPrev.length --; //清除最後一個壓入當前菜單ID數組的菜單ID
//showstatus(); //調試階段使用
}
}
function menu_onclick(obj,cmd) {
if(!mClick) { //如果菜單當前狀態是非點擊狀態，證明當前是從非點擊狀態到點擊狀態
obj.className = "MainMenuClick"; //設置當前菜單爲鼠標單擊之後的狀態
showMenu(obj,cmd); //顯示子菜單
//showstatus(); //調試階段使用
mClick = true; //設置菜單當前是點擊狀態
}else {
obj.className = "MainMenuOver"; //設置當前菜單爲鼠標移動上面的狀態，非點擊狀態
document.all.item(mnuPrev[mnuPrev.length-1].id).style.visibility = "hidden";
mnuPrev.length --;
//showstatus(); //調試階段使用
mClick = false; //主菜單當前是非點擊狀態
}
bMenuClick = true; //在一個菜單上單擊後設置其狀態爲true,用來屏蔽document_click事件
}
function bar_onmouseover(obj,type,cmd) {
for (var i=1;i<mnuPrev.length;i++) {
if(mnuPrev[i].id==obj.parentElement.id) {
for (var j=i+1;j<mnuPrev.length;j++) { //處理由前一個菜單項打開的子菜單，可能有多層
if (mnuPrev[j].type==0) { //如果是菜單項，設置成默認樣式
document.all.item(mnuPrev[j].id + "_ico").className = "ico";
document.all.item(mnuPrev[j].id + "_text").className = "text";
document.all.item(mnuPrev[j].id + "_skey").className = "skey";
document.all.item(mnuPrev[j].id + "_sub").className = "sub";
}else { //如果是菜單框，隱藏它
document.all.item(mnuPrev[j].id).style.visibility = "hidden";
}
}
mnuPrev.length = i + 1;
break;
}
}
mnuPrev[mnuPrev.length] = new menuinfo(obj.id,0);
//showstatus(); //調試階段使用
document.all.item(obj.id + "_ico").className = "icoOver";
document.all.item(obj.id + "_text").className = "textOver";
document.all.item(obj.id + "_skey").className = "skeyOver";
document.all.item(obj.id + "_sub").className = "subOver";
if (type==0) { showSubMenu(obj,cmd); } //如果有下一級菜單就展開
//showstatus(); //調試階段使用
}
function bar_onmouseout(obj,type,cmd) {
if (type!=0) {
document.all.item(obj.id + "_ico").className = "ico";
document.all.item(obj.id + "_text").className = "text";
document.all.item(obj.id + "_skey").className = "skey";
document.all.item(obj.id + "_sub").className = "sub";
if (mnuPrev.length>0) {
mnuPrev.length --;
}
//showstatus(); //調試階段使用
}
}
function bar_onclick(obj,type,cmd) {
if (type==1) {
//window.navigate(cmd); //跳轉到相應的文件
lblOutput.innerText = cmd; //演示期間，將文件名顯示出來
}else {
bMenuClick = true; //在一個菜單上單擊後設置其狀態爲true,用來屏蔽document_click事件
}
}
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// 以下爲與主文件有關的控制部分，具體使用時需要關注的也僅僅這部分而已
//_____________________________________________________________
var doc_width; //當前窗口的寬度，隨窗口大小改變而改變
var doc_height; //當前窗口的高度，隨窗口大小改變而改變
var mClick = false; //一級菜單是否被點擊，初始一級菜單是未被點擊狀態
var bMenuClick = false; //單擊是否是在一個菜單上，初始單擊不是在一個菜單上
var mnuPrev = new Array(); //當前顯示的菜單ID數組，初始爲空
function document_onselectstart() {
return false; //屏蔽內容選擇功能
}
function document_onclick() {
if(!bMenuClick) {
if (mnuPrev.length>0) {
for (var i=1;i<mnuPrev.length;i++) {
if (mnuPrev[i].type==0) { //如果是菜單項，設置成默認樣式
document.all.item(mnuPrev[i].id + "_ico").className = "ico";
document.all.item(mnuPrev[i].id + "_text").className = "text";
document.all.item(mnuPrev[i].id + "_skey").className = "skey";
document.all.item(mnuPrev[i].id + "_sub").className = "sub";
}else { //如果是菜單框，隱藏它
document.all.item(mnuPrev[i].id).style.visibility = "hidden";
}
}
document.all.item(mnuPrev[0].id).className = "MainMenu"; //將主菜單的狀態恢復普通狀態
}
mnuPrev.length = 0; //清空當前顯示菜單
mClick = false; //清除菜單點擊狀態
}else {
bMenuClick = false;
}
}
function window_onresize() {
//當窗口尺寸變化時改變相應變量的值
doc_height = window.document.body.offsetHeight;
doc_width = window.document.body.offsetWidth;
}
function window_onload() {
//初始化窗口尺寸
doc_height = window.document.body.offsetHeight;
doc_width = window.document.body.offsetWidth;
}
//-->
