javascript物件導向的方式實現的彈出層效果代碼

說到js的物件導向，就不得不提到prototype這個js內建屬性了(注意：這裡的prototype可不是prototype.js),它的作用就是可以動態向一個對象(object)添加某種屬性。我現在要做的就是儘可能的讓代碼達到公用，像繼承啦之類的。好了，這些就不多說了，對prototype不瞭解的可以搜尋下相關內容。

今天要做的是點擊一個html元素讓其彈出一個友好的對話方塊來，首先要明確兩點，一點是我可能會大量的用到這種方式，甚至不希望出現系統的alert或confirm，第二點就是彈出的內容盡量的可以多種化，甚至可以自訂。明確這兩點後，我們就可以寫js代碼了，都是些很初級的東西，如果你要鄙視的話就盡情的鄙視我吧！^.^

首先定義一個簡單的對象:

複製代碼 代碼如下:function objDIV() {
this.bgdiv ;
this.infodiv ;
}

首先，我們希望彈出一個遮罩層，我給它命名openBackDiv(); 複製代碼 代碼如下:function openBackDiv(txbdiv) {
txbdiv.bgdiv = document.createElement("div");
txbdiv.bgdiv.setAttribute("id", "overDiv");
txbdiv.bgdiv.innerHTML = "<iframe frameborder=\"no\" class=\"overPanel\" id=\"ifrover\"></iframe>";

}

再者，把它添加到剛剛定義的對象的prototype裡去(openBG()): 複製代碼 代碼如下:objDIV.prototype.openBG = function() {
openBackDiv(this);
document.body.appendChild(this.bgdiv);
this.bgdiv.style.display = "block";
this.bgdiv.style.width = document.documentElement.clientWidth + "px";
this.bgdiv.style.height = document.documentElement.scrollHeight + "px";
}

再就是添加彈出資訊層的方法,和上面一樣做就行了。所以才說這個是很基礎的東西，好像確實沒啥好說的，直接上代碼吧！

這是一個正在載入的彈出層，有點粗糙. 複製代碼 代碼如下:function openLoadDiv(txbdiv) {
txbdiv.infodiv = document.createElement("div");
txbdiv.infodiv.setAttribute("id", "div_info");
txbdiv.infodiv.innerHTML = "<div style=\" line-height:1.5;background:url(../images/tips-top-bg.gif) repeat-x; height:54px; text-align:center;\"><img border=\"0\" src=\"../images/xtts.gif\" /></div><div style='padding:20px; font-size:14px; color:#b44201;'><div style='width:100px; float:left;margin:60px 0 0 60px; height:80px;'><img src='/images/business/loading.gif' width='100px' height='100' border='0'/></div><div style='float:left; width:250px;margin:90px 0 0 20px;'><p>請稍等，正在處理中...</p></div></div></div>";
document.body.appendChild(txbdiv.infodiv);
txbdiv.infodiv.style.width = "550px";
txbdiv.infodiv.style.height = "270px";
txbdiv.infodiv.style.fontSize = "14px";
txbdiv.infodiv.style.position = "absolute";
txbdiv.infodiv.style.background = "#fff";
txbdiv.infodiv.style.zIndex = "9999";
centerobject();//置中的方法
}
objDIV.prototype.openLoading = function() { this.openBG(); openLoadDiv(this); }

做完這些後一個簡單的彈出載入層就完成了.是不是有點成就感了，那麼接著完成其他的工作吧！既然都彈出了，總得在某個時刻把它們移掉吧，下面就是移除這些層的方法。 複製代碼 代碼如下:objDIV.prototype.removeBG = function() {
if (this.bgdiv || document.getElementById("overDiv")) {
if (this.bgdiv) {
document.body.removeChild(this.bgdiv);
} else {
document.body.removeChild(document.getElementById("overDiv"));
}
}
}
objDIV.prototype.removeInfo = function() {
this.removeBG();
if (this.infodiv) {
document.body.removeChild(this.infodiv);
} else {
document.body.removeChild(document.getElementById("div_info"));
}
}

如果想彈出不同層資訊的話，就可以添加不同的prototype屬性。
完整的代碼
[code]

//******js彈出層提示txb20100110********//
function objDIV() {
this.bgdiv ;
this.infodiv ;
}
objDIV.prototype.openBG = function() {
openBackDiv(this);
document.body.appendChild(this.bgdiv);
this.bgdiv.style.display = "block";
this.bgdiv.style.width = document.documentElement.clientWidth + "px";
this.bgdiv.style.height = document.documentElement.scrollHeight + "px";
}
objDIV.prototype.openRegInfo = function() {
this.openBG();
openDiv(this);
}
objDIV.prototype.openLoading = function() {
this.openBG();
openLoadDiv(this);
}
objDIV.prototype.openLoad = function() {
openLoadDiv(this);
}
objDIV.prototype.removeBG = function() {
if (this.bgdiv || document.getElementById("overDiv")) {
if (this.bgdiv) {
document.body.removeChild(this.bgdiv);
} else {
document.body.removeChild(document.getElementById("overDiv"));
}
}
}
objDIV.prototype.removeInfo = function() {
this.removeBG();
if (this.infodiv) {
document.body.removeChild(this.infodiv);
} else {
document.body.removeChild(document.getElementById("div_info"));
}
}

function openLoadDiv(txbdiv) {
txbdiv.infodiv = document.createElement("div");
txbdiv.infodiv.setAttribute("id", "div_info");
txbdiv.infodiv.innerHTML = "<div style=\" line-height:1.5;background:url(tips-top-bg.gif) repeat-x; height:54px; text-align:center;\"><img border=\"0\" src=\"xtts.gif\" /></div><div style='padding:20px; font-size:14px; color:#b44201;'><div style='width:100px; float:left;margin:60px 0 0 60px; height:80px;'><img src='loading.gif' width='100px' height='100' border='0'/></div><div style='float:left; width:250px;margin:90px 0 0 20px;'><p>請稍等，正在處理中...</p></div></div></div>";
document.body.appendChild(txbdiv.infodiv);
txbdiv.infodiv.style.width = "550px";
txbdiv.infodiv.style.height = "270px";
txbdiv.infodiv.style.fontSize = "14px";
txbdiv.infodiv.style.position = "absolute";
txbdiv.infodiv.style.background = "#fff";
txbdiv.infodiv.style.zIndex = "9999";

centerobject();
}

function openBackDiv(txbdiv) {
txbdiv.bgdiv = document.createElement("div");
txbdiv.bgdiv.setAttribute("id", "overDiv");
//alert(document.documentElement.clientWidth);
txbdiv.bgdiv.innerHTML = "<iframe frameborder=\"no\" class=\"overPanel\" id=\"ifrover\"></iframe>";
//"<div id=\"overPanel\" > <iframe frameborder=\"no\" class=\"overPanel\" id=\"ifrover\"></iframe></div>";
//txbdiv.openBG();
}
function openDiv(txbdiv) {
//txbdiv.openBG();
txbdiv.infodiv = document.createElement("div");
txbdiv.infodiv.setAttribute("id", "div_info");
txbdiv.infodiv.innerHTML = "<div style=\" line-height:1.5;background:url(tips-top-bg.gif) repeat-x; height:54px; text-align:center;\"><img border=\"0\" src=\"xtts.gif\" /></div><div style=\"padding:20px;\"><div style=\"width:120px; float:left;\"><img src=\"xin.gif\" /></div><div style=\"float:right; width:350px;color:#b44201;\" id=\"showdivinfo\"><p>恭喜您，註冊成功!</p><p>請牢記您的帳號：<font color=\"#b44201\" id=\"orpai_ID\">5678537</font></p></div><div style=\"margin:0 auto;\"><input type='button' value='確認' onclick='new objDIV().removeInfo();'/></div></div>";
document.body.appendChild(txbdiv.infodiv);
txbdiv.infodiv.style.width = "550px";
txbdiv.infodiv.style.height = "270px";
txbdiv.infodiv.style.fontSize = "14px";
txbdiv.infodiv.style.position = "absolute";
txbdiv.infodiv.style.background = "#fff";
txbdiv.infodiv.style.zIndex = "9999";

centerobject();
}

function centerobject() {
if (document.getElementById("overDiv")) {
var objdiv = document.getElementById("overDiv").style;
objdiv.height = document.documentElement.scrollHeight + "px";
objdiv.left = parseInt((document.documentElement.clientWidth - parseInt(objdiv.width)) / 2) + "px";
//alert(document.documentElement.scrollHeight)
objdiv.top = parseInt((document.documentElement.clientHeight - parseInt(objdiv.height)) / 2) + "px";
}
if (document.getElementById("div_info")) {
var div_info = document.getElementById("div_info").style;
div_info.left = parseInt((document.documentElement.clientWidth - parseInt(div_info.width)) / 2) + "px";
div_info.top = parseInt((document.documentElement.clientHeight - parseInt(div_info.height)) / 2) + "px";
}
}

function centerDIV(objId) {
if (document.getElementById(objId)) {
var objdiv = document.getElementById(objId).style;
objdiv.height = document.getElementById(objId).scrollHeight + "px";
objdiv.width = document.getElementById(objId).scrollWidth + "px";
objdiv.left = parseInt((document.documentElement.clientWidth - parseInt(objdiv.width)) / 2) + "px";
//alert(document.documentElement.scrollHeight)
objdiv.top = parseInt((document.documentElement.clientHeight - parseInt(objdiv.height))/ 2) + "px";

}
}

function centerObj(obj) {
if (obj) {
var objdiv = obj.style;
objdiv.height = obj.scrollHeight + "px";
objdiv.width = obj.scrollWidth + "px";
objdiv.left = parseInt((document.documentElement.clientWidth - parseInt(objdiv.width)) / 2) + "px";
//alert(document.documentElement.scrollHeight)
objdiv.top = parseInt((document.documentElement.clientHeight - parseInt(objdiv.height)) / 2) + "px";
}
}
//window.onresize = centerobject;
[code]
示範地址 http://demo.jb51.net/js/opendiv/opendiv.htm