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用JavaScript实现仿Windows关机效果

时间:2007-12-27 来源:不详作者:林子

//未加载时清空缓存
Event.observe(window, 'unload', Event.unloadCache, false);
//初始化方法
function initialize(){
//调用该方法为该页添加覆盖层和高亮显示层
addLightboxMarkup();
//为每个可高亮显示的元素创建lightbox对象
lbox = document.getElementsByClassName('lbOn');
for(i = 0; i < lbox.length; i ) {
valid = new lightbox(lbox[i]);
}
}
// 使用Dom方法创建覆盖层和高亮层
function addLightboxMarkup() {
bod = document.getElementsByTagName('body')[0];
overlay = document.createElement('div');
overlay.id = 'overlay';
lb = document.createElement('div');
lb.id = 'lightbox';
lb.className = 'loading';
lb.innerHTML = '<div id="lbLoadMessage">'
'<p>Loading</p>'
'</div>';
bod.appendChild(overlay);
bod.appendChild(lb);
}
封装lightbox类
初始化数据时，为每个可高亮显示的链接创建了lightbox对象。该类的代码具体实现如下：
var lightbox = Class.create();
lightbox.prototype = { dedecms.com
yPos : 0,
xPos : 0,
//构造方法,ctrl为创建该对象的元素
initialize: function(ctrl) {
//将该元素的链接赋值给this.content
this.content = ctrl.href;
//为该元素添加onclick事件activate方法
Event.observe(ctrl, 'click', this.activate.bindAsEventListener(this), false);
ctrl.onclick = function(){return false;};
},
//当单击链接时
activate: function(){
if (browser == 'Internet Explorer'){//判定为IE浏览器
this.getScroll();
this.prepareIE('100%', 'hidden');
this.setScroll(0,0);
this.hideSelects('hidden');//隐藏所有的<select>标记
}
//调用该类中的displayLightbox方法
this.displayLightbox("block");
},
prepareIE: function(height, overflow){
bod = document.getElementsByTagName('body')[0];
bod.style.height = height;
bod.style.overflow = overflow;

htm = document.getElementsByTagName('html')[0];
htm.style.height = height;
htm.style.overflow = overflow;
},
hideSelects: function(visibility){

织梦好，好织梦

selects = document.getElementsByTagName('select');
for(i = 0; i < selects.length; i ) {
selects[i].style.visibility = visibility;
}
},
getScroll: function(){
if (self.pageYOffset) {
this.yPos = self.pageYOffset;
} else if (document.documentElement && document.documentElement.scrollTop){
this.yPos = document.documentElement.scrollTop;
} else if (document.body) {
this.yPos = document.body.scrollTop;
}
},
setScroll: function(x, y){
window.scrollTo(x, y);
},
displayLightbox: function(display){
//将覆盖层显示
$('overlay').style.display = display;
//将高亮层显示
$('lightbox').style.display = display;
//假如不是隐藏状态,则调用该类中的loadInfo方法
if(display != 'none') this.loadInfo();
},
//该方法发送Ajax请求
loadInf function() {
//当请求完成后调用本类中processInfo方法
var myAjax = new Ajax.Request(
this.content,
{method: 'get', parameters: "", onComplete: this.processInfo.bindAsEvent Listener (this)}